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PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
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© 1998 - 2001 DH Instruments, Inc. All rights reserved.
Information in this document is subject to change without notice. No part of this document may be reproduced or
transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written
permission of DH Instruments, Inc. 4765 East Beautiful Lane Phoenix AZ 85044-5318 USA.
DH Instruments makes sincere efforts to ensure accuracy and quality of its’ published materials; however, no
warranty, expressed or implied, is provided. DH Instruments disclaims any responsibility or liability for any direct or
indirect damages resulting from the use of the information in this manual or products described in it. Mention of any
product does not constitute an endorsement by DH Instruments of that product. This manual was originally
composed in English and was subsequently translated into other languages. The fidelity of the translation cannot
be guaranteed. In case of conflict between the English version and other language versions, the English
version predominates.
DH Instruments, DH, DHI, PPC, PPC2, PPC2+, and AutoZ are trademarks, registered and otherwise.
Document No. 550091f
010403
Printed in the USA
PPC2+™ Operation and Maintenance Manual
Page i
©2001 DH Instruments, Inc.
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900--9
98
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TABLE OF CONTENTS ................................................................................i
TABLES ................................................................................................... iv
FIGURES .................................................................................................. v
ABOUT THIS MANUAL .............................................................................. vi
1. INTRODUCTION .................................................................................... 1
1.1
PRODUCT OVERVIEW............................................................................................................................. 1
1.2
SPECIFICATIONS..................................................................................................................................... 2
1.2.1
GENERAL SPECIFICATIONS .......................................................................................................................2
1.2.2
PRESSURE MEASUREMENT SPECIFICATIONS ........................................................................................2
1.2.2.1
REFERENCE PRESSURE TRANSDUCER (RPT) SPECIFICATIONS ..........................................3
1.2.2.2
ON-BOARD BAROMETER.............................................................................................................4
1.2.3
PRESSURE CONTROL SPECIFICATIONS...................................................................................................4
1.2.4
ANALOG INPUT SPECIFICATION................................................................................................................5
2. INSTALLATION ..................................................................................... 7
2.1
UNPACKING AND INSPECTION.............................................................................................................. 7
2.1.1
REMOVING FROM PACKAGING..................................................................................................................7
2.1.2
INSPECTING CONTENTS .............................................................................................................................7
2.2
SITE REQUIREMENTS............................................................................................................................. 8
2.3
INITIAL SETUP ......................................................................................................................................... 8
2.3.1
PREPARING FOR OPERATION....................................................................................................................8
2.3.2
FRONT AND REAR PANELS ........................................................................................................................9
2.3.2.1
FRONT PANEL ..............................................................................................................................9
2.3.2.2
REAR PANEL ASSEMBLY .......................................................................................................... 10
2.3.3
POWER CONNECTION............................................................................................................................... 10
2.3.4
CONNECTING TO A PRESSURE SUPPLY (SUPPLY PORT) .................................................................... 11
2.3.5
CONNECTING A VACUUM PUMP (EXHAUST PORT) ............................................................................... 11
2.3.6
CONNECTING TO THE DEVICE UNDER TEST (TEST AND TEST(-) PORTS) ...................................................... 11
2.3.6.1
INSTALLING THE SPLT .............................................................................................................. 12
2.3.7
THE VENT CONNECTION (VENT PORT) ................................................................................................... 13
2.3.8
THE ATM REF PASS THROUGH (UNLABELED)....................................................................................... 13
2.4
POWER-UP AND VERIFICATION .......................................................................................................... 13
2.4.1
SWITCH POWER ON................................................................................................................................... 13
2.4.2
CHECK PROPER PRESSURE MEASUREMENT OPERATION.................................................................. 14
2.4.2.1
CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT.................................................. 14
2.4.2.2
CHECKING GAUGE MODE PRESSURE MEASUREMENT ........................................................ 14
2.4.3
LEAK CHECK.............................................................................................................................................. 14
2.4.4
PURGE ........................................................................................................................................................ 15
2.4.5
CHECK PROPER PRESSURE CONTROL OPERATION............................................................................ 15
2.5
SHORT TERM STORAGE ...................................................................................................................... 15
3. OPERATION........................................................................................ 17
3.1
GENERAL/MANUAL OPERATION......................................................................................................... 17
3.1.1
MAIN RUN SCREEN.................................................................................................................................... 17
3.1.2
GENERAL OPERATING PRINCIPLES........................................................................................................ 18
3.1.2.1
MAIN 4 X 4 KEYPAD LAYOUT AND PROTOCOL ....................................................................... 18
3.1.2.2
DIRECT PRESSURE CONTROL KEYS....................................................................................... 19
3.1.2.3
AUTOMATED PRESSURE CONTROL ........................................................................................ 20
3.1.2.4
PRESSURE READY (<*>)/NOT READY (<↑> OR <↓>)............................................................... 22
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page ii
3.1.2.5
MULTIPLE PRESSURE RANGES ............................................................................................... 24
3.2
DIRECT FUNCTION KEYS ..................................................................................................................... 25
3.2.1
RANGE ........................................................................................................................................................ 25
3.2.1.1
RANGE SPECIFIC FUNCTIONS AND SETTINGS ...................................................................... 27
3.2.2
UNIT............................................................................................................................................................. 27
3.2.3
CONTROL.................................................................................................................................................... 29
3.2.3.1
SYSTEM DEFAULT CONTROL PARAMETERS.......................................................................... 30
3.2.3.2
EXECUTING AUTOMATED PRESSURE CONTROL COMMANDS............................................. 30
3.2.4
UPPER LIMIT............................................................................................................................................... 33
3.2.4.1
OVERPRESSURE FUNCTION .................................................................................................... 34
3.2.5
SEQ.............................................................................................................................................................. 34
3.2.5.1
SETTING UP/EDITING A QUICK SEQUENCE ............................................................................ 34
3.2.5.2
SETTING UP/EDITING A FILE SEQUENCE................................................................................ 36
3.2.5.3
RUNNING A SEQUENCE ............................................................................................................ 36
3.2.6
CUSTOM CONTROL ................................................................................................................................... 38
3.2.6.1
TURNING-OFF CUSTOM CONTROL PARAMETERS................................................................. 40
3.2.7
HEAD........................................................................................................................................................... 40
3.2.8
LEAK CHECK/PURGE ................................................................................................................................ 41
3.2.8.1
LEAK CHECK/PURGE MENU AND FUNCTIONS FLOW CHART ............................................... 42
3.2.8.2
LEAK CHECK SCREEN............................................................................................................... 43
3.2.8.3
PURGE FUNCTION ..................................................................................................................... 44
3.2.8.4
SETTING PRESSURES FOR LEAK CHECK/PURGE FUNCTION .............................................. 46
3.2.8.5
TYPICAL USE OF THE LEAK CHECK/PURGE FUNCTION........................................................ 47
3.2.9
ANALOG...................................................................................................................................................... 48
3.2.9.1
VIEWING ANALOG MEASUREMENTS ....................................................................................... 49
3.3
SETUP MENU KEY................................................................................................................................. 49
3.3.1
CONTROLREF............................................................................................................................................. 49
3.3.2
RESLTN....................................................................................................................................................... 51
3.3.3
SEQUENCE ................................................................................................................................................. 51
3.3.4
DRIVERS ..................................................................................................................................................... 55
3.4
SPECIAL MENU KEY ............................................................................................................................. 56
3.4.1
AUTOZ......................................................................................................................................................... 56
3.4.1.1
VIEW AUTOZ............................................................................................................................... 59
3.4.1.2
EDIT AUTOZ................................................................................................................................ 60
3.4.1.3
RUN AUTOZ ................................................................................................................................ 60
3.4.2
HEAD........................................................................................................................................................... 64
3.4.3
PRESU......................................................................................................................................................... 65
3.4.4
INTERNAL ................................................................................................................................................... 66
3.4.4.1
CONFIG ....................................................................................................................................... 66
3.4.4.2
CAL.............................................................................................................................................. 67
3.4.4.3
REMOTE...................................................................................................................................... 67
3.4.4.4
TIME ............................................................................................................................................ 68
3.4.4.5
RESET ......................................................................................................................................... 69
3.4.4.6
LEVEL.......................................................................................................................................... 71
3.4.4.7
ATM ............................................................................................................................................. 74
3.4.4.8
PURGE ........................................................................................................................................ 75
3.4.4.9
SCRSAV ...................................................................................................................................... 75
4. REMOTE OPERATION.......................................................................... 77
4.1
OVERVIEW ............................................................................................................................................. 77
4.2
INTERFACING ........................................................................................................................................ 77
4.2.1
RS-232 INTERFACE.................................................................................................................................... 77
4.2.1.1
COM1........................................................................................................................................... 77
4.2.1.2
IEEE-488...................................................................................................................................... 78
4.2.1.3
COM2........................................................................................................................................... 78
4.3
PROGRAMMING FORMATS .................................................................................................................. 79
4.3.1
CLASSIC PROGRAM MESSAGE FORMAT ............................................................................................... 79
4.3.2
ENHANCED PROGRAM MESSAGE FORMAT........................................................................................... 79
4.3.2.1
ENHANCED PROGRAM MESSAGE USING THE COMMAND TYPE ......................................... 80
4.3.2.2
ENHANCED PROGRAM MESSAGE USING THE QUERY TYPE ............................................... 80
4.4
COMMANDS ........................................................................................................................................... 81
4.4.1
PROGRAM MESSAGES.............................................................................................................................. 81
4.4.2
ERROR MESSAGES ................................................................................................................................... 83
PPC2+™ Operation and Maintenance Manual
Page iii
©2001 DH Instruments, Inc.
4.4.3
PROGRAM MESSAGE DESCRIPTION OVERVIEW................................................................................... 84
4.4.4
PROGRAM MESSAGE DESCRIPTIONS .................................................................................................... 85
4.5
STATUS REPORTING SYSTEM .......................................................................................................... 116
4.5.1
ERROR QUEUE......................................................................................................................................... 116
4.5.2
STATUS BYTE REGISTER ....................................................................................................................... 117
4.5.3
STANDARD EVENT REGISTER ............................................................................................................... 119
4.5.4
READY STATUS REGISTER..................................................................................................................... 120
4.6
IEEE STD. 488.2 COMMON AND STATUS PROGRAM MESSAGES................................................. 120
4.6.1
PROGRAM MESSAGE DESCRIPTIONS .................................................................................................. 121
5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION........................... 125
5.1
OVERVIEW ........................................................................................................................................... 125
5.2
CALIBRATION OF REFERENCE PRESSURE TRANSDUCERS ........................................................ 126
5.2.1
PRINCIPLE ................................................................................................................................................ 126
5.2.1.1
PA/PM COEFFICIENTS.............................................................................................................127
5.2.1.2
SETTING ZNATERR.................................................................................................................. 127
5.2.1.3
ORDER OF OPERATIONS ........................................................................................................ 128
5.2.1.4
AS RECEIVED/AS LEFT DATA ................................................................................................. 128
5.2.2
EQUIPMENT REQUIRED .......................................................................................................................... 128
5.2.3
SET-UP AND PREPARATION................................................................................................................... 129
5.2.4
RPT CALIBRATION USING CALTOOL FOR RPTS SOFTWARE............................................................. 130
5.2.5
EDITING AND VIEWING RPT CALIBRATION INFORMATION................................................................. 130
5.2.6
SETTING ZNATERR.................................................................................................................................. 131
5.2.7
RPT CALIBRATION/ADJUSTMENT WITHOUT CALTOOL FOR RPTS SOFTWARE .............................. 132
5.3
ADJUSTMENT OF ON-BOARD BAROMETER.................................................................................... 133
5.4
CALIBRATION OF ANALOG INPUT.................................................................................................... 134
5.4.1
CALIBRATION PRINCIPLE....................................................................................................................... 134
5.4.1.1
AUTOMATED INTERNAL CALIBRATION.................................................................................. 134
5.4.1.2
USER ADJUSTMENT OF ANALOG MEASUREMENT RANGES AND CHANNELS.................. 135
5.4.2
ADJUSTING ANALOG MEASUREMENT CHANNELS ............................................................................. 135
5.5
PNEUMATIC CONTROL MODULE CONFIGURATION ....................................................................... 136
5.6
OVERHAUL........................................................................................................................................... 138
5.7
RELOADING EMBEDDED SOFTWARE INTO FLASH MEMORY....................................................... 138
5.8
SUBASSEMBLY DESCRIPTION AND LOCATION.............................................................................. 139
5.8.1
INTERNAL VIEW ....................................................................................................................................... 139
5.8.1.1
ON-BOARD BAROMETER......................................................................................................... 140
5.8.1.2
POWER SUPPLY....................................................................................................................... 140
5.8.1.3
TRANSDUCER SELECTION MODULE ..................................................................................... 140
5.8.1.4
DRIVER BOARD........................................................................................................................ 140
5.8.1.5
MICRO CARD ............................................................................................................................ 140
5.8.1.6
REFERENCE PRESSURE TRANSDUCERS............................................................................. 140
5.8.1.7
PNEUMATIC MODULE .............................................................................................................. 141
6. TROUBLESHOOTING ......................................................................... 143
6.1
OVERVIEW ........................................................................................................................................... 143
7. APPENDIX ........................................................................................ 149
7.1
DRIVERS............................................................................................................................................... 149
7.2
ANALOG ............................................................................................................................................... 151
7.2.1
DETAILED SIGNAL DESCRIPTIONS........................................................................................................ 151
7.3
UNIT CONVERSION ............................................................................................................................. 152
7.3.1
PRESSURE................................................................................................................................................ 152
8. WARRANTY STATEMENT................................................................... 153
8.1
OVERVIEW ........................................................................................................................................... 153
9. GLOSSARY....................................................................................... 155
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page iv
>>++,,66//==
Table 1.
Reference Pressure Transducer (RPT) Designations and Ranges ...........................................3
Table 2.
Default Pressure Control Parameters ........................................................................................4
Table 3.
Analog Input Specifications........................................................................................................5
Table 4.
PPC2+ Packing List ...................................................................................................................7
Table 5.
PPC2+ Range Identification Summary.....................................................................................25
Table 6.
Lo or Hi Reference Transducer Range 1, 2, 3 .........................................................................30
Table 7.
System Default Control Parameters.........................................................................................39
Table 8.
UNIT Function - Available Units...............................................................................................65
Table 9.
Security Levels.........................................................................................................................73
Table 10.
Pin Designations and Connections ..........................................................................................78
Table 11.
List of PPC2+ COM2 DB-9F Pin Designations ........................................................................78
Table 12.
Program Message List .............................................................................................................81
Table 13.
Error #’s and Descriptions........................................................................................................83
Table 14.
8 Bit Status Byte Register ......................................................................................................117
Table 15.
8 Bit Standard Event Register................................................................................................119
Table 16.
8 Bit Ready Status Register ...................................................................................................120
Table 17.
Program Message List ...........................................................................................................120
Table 18.
Troubleshooting Guide...........................................................................................................143
Table 19.
Driver Output..........................................................................................................................149
Table 20.
External Drivers......................................................................................................................150
Table 21.
Analog Port/Signal Descriptions.............................................................................................151
Table 22.
Conversion Coefficients .........................................................................................................152
Table 23.
Warranty Service Centers......................................................................................................154
PPC2+™ Operation and Maintenance Manual
Page v
©2001 DH Instruments, Inc.
00331
1?
?<)/Not Ready (<↑> or <↓>) Static Control Mode......................................................23
Figure 8.
Ready (<*>)/Not Ready (<↑> or <↓>) in Dynamic Pressure Control Mode..............................23
Figure 9.
Hi and Low RPT Pneumatic Circuit..........................................................................................24
Figure 10. Leak Check/Purge Menu Flow Chart .......................................................................................43
Figure 11. Status Register Schematic.....................................................................................................117
Figure 12. Internal View ..........................................................................................................................139
Figure 13. Pneumatic Module (Schematic) .............................................................................................141
Figure 14. Cable Schematic....................................................................................................................150
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page vi
++,,9
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?>>>>2
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7++8
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?++66
Manual Conventions
This manual is intended to provide the user with the basic information necessary to operate a PPC2+
pressure controller/calibrator. It also includes a great deal of additional information provided to allow
you to optimize its use and take full advantage of its many features and functions.
Before using the manual, take a moment to familiarize yourself with the table of contents structure:
Sections 1, 2 and 3 should be read by all first time PPC2+ users. Section 3 is most important for those
using the local front panel interface but should be read over by all users to familiarize themselves with
general PPC2+ operating principles. Section 4 is for remote operation from an external computer.
Section 5 provides maintenance and calibration information. Section 6 is a quick
troubleshooting guide. Use it to troubleshoot unexpected PPC2+ behavior based on the symptom of
that behavior.
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Certain words and expressions have specific meaning as they pertain to PPC2+. The Glossary
Section is useful as a quick reference for exact definition of specific words and expressions as they are
used in the manual.
-+?>398S]_]ONSXWKX_KV^YSNOX^SPc_]O\aK\XSXQ]KXNMK_^SYX]
89>/S]_]ONSX^ROWKX_KV^YSNOX^SPcYZO\K^SXQKXNKZZVSMK^SYX]KN`SMOKXNKNNS^SYXKVObZVKXK^SYX]
[ ] indicates direct function keys (e.g., [RANGE]).
< > indicates PPC2+ screen displays (e.g., <1yes>).
PPC2+™ Operation and Maintenance Manual
Page 1
©2001 DH Instruments, Inc.
38><9.?->398
1.1 PRODUCT OVERVIEW
PPC2+ is a stand-alone, microprocessor driven, pressure controller/calibrator intended to apply and
measure accurate values of gas pressure for the calibration and testing of pressure
measuring instruments. It has been designed to provide very high performance combined with
maximum versatility and ease of use.
PPC2+ measures pressures using one or two high accuracy reference pressure transducers (RPTs)
and an on-board barometer. Pressures control is achieved by a pneumatic module based on solenoid
valves and differential pressure regulators.
PPC2+ can be controlled locally by the operator using a front panel display, keypad and special
function keys or remotely by a computer using ASCII character command strings over an RS-232 or
IEEE-488 interface.
PPC2+ models are available to measure and control pressure in ranges up to 0 to 1 500 psi
(0 to 10 MPa) in both gauge and absolute measurement modes.
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 2
1.2 SPECIFICATIONS
1.2.1
GENERAL SPECIFICATIONS
Power Requirements:
85 to 264 VAC, 50/60 Hz, 30 VA max consumption
Operating Temperature Range:
15 to 35 °C
Storage Temperature Range:
-20 to 70 °C
Vibration:
Meets MIL-T-28800D
Weight:
12.8 kg (28.2 lb)
Dimensions:
7.1 in. H x 12.6 in. W x 15.8 in. D (18 cm x 32 cm x 40 cm)
Microprocessor:
Motorola 68302, 16 MHz
Communication Ports:
RS-232 (COM1), RS-232 (COM2), IEEE-488
Pressure Ranges:
Up to six pressure ranges from 0 to 5 psi (33 kPa) to 0 to 1 500 psi
(10 000 kPa) using one or two reference pressure transducers and a
barometer
Operating Medium:
Any clean, dry, non-corrosive gas
Pressure Connections:
Supply:
1/8 in. NPT F
Test(+):
1/4 in. NPT F
Test(-):
1/4 in. NPT F (with gauge RPT only)
Vent:
1/4 in. NPT F
Exhaust:
1/4 in. NPT F
Atm Ref:
Pass through
Pressure Limits:
Maximum Working Test Pressure:
Range H3+5 %
Maximum Test Pressure without Damage:
Range H3+10 %
Recommended Supply Pressure:
Range H3+10 %
Maximum Supply Pressure without Damage:
If Range H3>1 000 psi (7 000 kPa):
2 000 psi (14 000 kPa)
If 300 psi (2 000 kPa) ) or two (<6 ranges>) Reference Pressure Transducers (RPTs) and a barometer.
All RPTs with ranges over 30 psi (200 kPa) are of the absolute pressure type using an
evacuated, permanently sealed reference. Absolute RPTs can measure both absolute and
gauge pressure. Gauge pressures with an absolute RPTs are defined by offsetting
atmospheric pressure with dynamic compensation for atmospheric changes using the on-
board barometer. Gauge RPTs cannot measure absolute pressure.
PPC2+™ Operation and Maintenance Manual
Page 3
©2001 DH Instruments, Inc.
Table 1. Reference Pressure Transducer (RPT) Designations and Ranges
1.2.2.1
REFERENCE PRESSURE TRANSDUCER (RPT) SPECIFICATIONS
+66@+6?/=+2/+->3@/<+81/?86/==9>2//.
Warm Up Time:
None required
Resolution:
To 1 ppm, user settable by individual range
Temperature Effect:
Fully compensated with active independent temperature
measurement from -20 to 100 °C
± 0.005 % maximum temperature effect in normal ambient
15 to 35°C operating range
Acceleration Affect:
± 0.008 % /g maximum, worst axis
Allows operation at ± 20° from reference plane without
significant effect
Precision
1:
± 0.005 %
Stability:
90 day
1 year
Gauge Mode (w/Autozero):
0.003 %
0.009 %
Absolute Mode (w/Autozero):
0.003 %
0.009 %
Absolute Mode (w/out Autozero):
0.006 %
0.015 %
Measurement Accuracy
2:
90 day
1 year
Gauge Mode (w/Autozero):
0.008 %
0.012 %
Absolute Mode (w/Autozero):
0.008 %
0.012 %
Absolute Mode (w/out Autozero):
0.010 %
0.017 %
1
Measurement Precision: Combined linearity, hysteresis, repeatability of measurements made
by the reference pressure transducer.
2
Measurement Accuracy: Maximum deviation of the reference pressure transducer indication
from the true value of measured pressure including precision, stability, temperature effect and
calibration standard accuracy of ± 0.0035 % of reading.
NOTE: When using an absolute reference pressure transducer for gauge mode measurements in
a gauge range of < 30 psi (200 kPa), add ± 0.001 psi (8 Pa) to the measurement specification to
take into account the resolution of the on-board barometer.
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 4
1.2.2.2
ON-BOARD BAROMETER
The barometric sensor is NOT used as a source of absolute accuracy. It is used
ONLY to measure changes in atmospheric pressure to provide dynamic
compensation of the RPTs atmospheric pressure offset when using an absolute RPT
to make gauge pressure measurements.
1.2.3
PRESSURE CONTROL SPECIFICATIONS
+VV`KV_O]K\OÝ0=YP^ROKM^S`O\KXQO_XVO]]Y^RO\aS]OSXNSMK^ON
Modes and Ready (<*>)
Indication:
Static:
Sets pressure within hold limit and stops active
control until hold limit is exceeded
Pressure is Ready (<*>) when within hold limit and
stability test is met
Dynamic:
Sets pressure within hold limit and continuously
adjusts as close as possible to target
Pressure is Ready (<*>) when within hold limit
Control Parameters:
Hold limit, stability limit (optimum values set by default, can be
customized independently for each measurement range)
Table 2. Default Pressure Control Parameters
Lo REFERENCE TRANSDUCER
RANGE 1, 2, 3
Hi REFERENCE TRANSDUCER
RANGE 1, 2, 3
HOLD LIMIT
STABILITY LIMIT
HOLD LIMIT
STABILITY LIMIT
STATIC
MODE
± 1 % FS of the active
pressure range
± 0.005 % FS/sec
of the active
pressure range
± 1 % FS of the
active pressure
range
± 0.005 % FS/sec
of the active
pressure range.
DYNAMIC
MODE
± 0.005 % FS of the
active pressure range
or ± 2 ppm of range H3,
whichever is larger
± 0.005 % of the
active pressure
range
± 0.005 % FS of
the active pressure
range
± 0.005 % FS of
the active pressure
range
PPC2+™ Operation and Maintenance Manual
Page 5
©2001 DH Instruments, Inc.
Control Precision
1:
± 0.001 % (with 30:1 maximum ratio between highest and lowest
range)
Normal Test Volume:
Lo (max range < 300 psi): 100 to 1 000 cc (500 cc optimal)
Hi (max range 300 psi): 0 to 500 cc (250 cc optimal)
Control Speed:
Slew Rate (0 to Controller FS)
in Optimal Volume with No Control: 10 to 30 seconds
Pressure Setting (Typical Time To
Ready (<*>) Indication in
Dynamic Mode):
20 to 30 seconds (lower for
low, higher for high ranges)
Reduced by increasing hold
limit
Minimum Control Pressure:
Gauge Mode:
None when EXHAUST at vacuum
Absolute Mode: 0.2 % FS of range H3, will also set zero absolute
(see Section 3.2.3.1).
Delivered Pressure Accuracy
2:
90 day
1 year
Gauge Mode:
0.010 %
0.013 %
Absolute Mode (w/Autozero):
0.010 %
0.013 %
Absolute Mode (w/out Autozero):
0.012 %
0.018 %
1
Control Precision: Minimum useable hold limit in dynamic control mode.
2
Delivered Pressure Accuracy: Maximum deviation from the true value of pressure applied to the
device under test in dynamic control mode with default control limits and assuming measurement
accuracy as in Section 1.2.2.1. In static control mode, control errors can be eliminated making
accuracy of delivered pressure the same as measurement accuracy.
1.2.4
ANALOG INPUT SPECIFICATION
Table 3. Analog Input Specifications
MEASUREMENT
RANGE
DISPLAY
RESOLUTION
A/D
RESOLUTION
ACCURACY
(+/- % FS)
0 to 100 mV
0.001
0.014
0.05
0 to 5 V
0.001
0.7
0.03
0 to 10 V
0.001
0.14
0.03
4 to 20 mA
0.001
0.003
0.05
24 V Power Source: Four channels, each output independently can sink 250 mA at 24 V, but
maximum output of all four channels must not exceed 250 mA.
PPC2+™ Operation and Maintenance Manual
Page 7
©2001 DH Instruments, Inc.
38=>+66+>398
2.1 UNPACKING AND INSPECTION
2.1.1
REMOVING FROM PACKAGING
PPC2+ is delivered in a custom corrugated container with high density polyethylene inserts to
hold it in place; or in the optional molded medium density polyethylene shipping case with a
custom foam insert for holding the PPC2+ and SPLT (if included).
Remove the PPC2+ and its accessories from the shipping container and remove each
element from its protective plastic bag.
2.1.2
INSPECTING CONTENTS
Check that all items are present and have NO visible damage.
A standard PPC2+ includes all items indicated in Table 4.
Table 4. PPC2+ Packing List
DESCRIPTION
PART NO.
PPC2+ Pressure Controller/Calibrator
FAM0002
Calibration Certificate
550100
Test Report
550103
Accessories:
401357 or 401357-CE
Operation and Maintenance Manual
550091
Power Cord (7.5 ft.)
100770 or 100770-CE
(6) Rubber Feet Caps
400203
General Accessories Disk (Important: Includes
system support software and documentation.)
102987
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 8
2.2 SITE REQUIREMENTS
The PPC2+ can be installed on any flat, stable surface at a convenient height. The front feet can be
extended so that the unit can be inclined slightly for easier viewing. The PPC2+ can also be mounted
in a standard 19-in. rack mount using the optional rack mount kit.
Minimizing the length of tubing connecting the PPC2+ to the device or system to be tested will
enhance control performance and reduce pressure setting times.
Ready access to the PPC2+ rear panel should be considered to facilitate making and breaking
pressure connections.
The Self Purging Liquid Trap (SPLT), if used, should be mounted vertically at the low point of the
pneumatic system.
Support facilities required include:
•
An electrical power source of 85 to 264 VAC, 47 to 440 Hz.
•
A continuous regulated pressure supply of clean, dry, non-corrosive gas at maximum PPC2+
range (H3) +10 % to be connected to the SUPPLY port. Lower gas pressure supply can be used
but should exceed the maximum desired test output pressure by 10 to 20 %.
•
A vacuum source of less than 1 psia (7 kPa) and with displacement of at least 3 cfm (90 lm) if
control of pressures under 3 psi (20 kPa) gauge is desired.
2.3 INITIAL SETUP
2.3.1
PREPARING FOR OPERATION
To prepare PPC2+ for check out and operation:
•
Remove the plastic caps from the PPC2+ rear panel pressure connections.
•
Remove the protective plastic sheet from the front panel display.
•
Install the rubber feet caps onto the bottom case feet, if desired.
•
Familiarize yourself briefly with the front and rear panel (see Section 2.3.2).
PPC2+™ Operation and Maintenance Manual
Page 9
©2001 DH Instruments, Inc.
2.3.2
FRONT AND REAR PANELS
2.3.2.1
FRONT PANEL
The front panel assembly provides a 2 x 20 vacuum fluorescent display of PPC2+
operating status and a membrane keypad for local user control.
1.
Multi-Function Keypad
3.
Remote Indicator
2.
Direct Pressure Control Keys
4.
Display
Figure 1. Front Panel
2
3
4
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 10
2.3.2.2
REAR PANEL ASSEMBLY
The rear panel assembly provides pressure connections, communications interfaces,
the power ON/OFF module and product labeling. Pressure fittings are internally
secured to prevent loosening when making and breaking connections.
1.
Label, Product
9.
Fuse
2.
Pressure Connection, SUPPLY
10. Pressure Connection, TEST
3.
Analog Option Connector
11. Pressure Connection, TEST(-)
4.
Drivers Option Connector
(models with gauge RPT only)
5.
IEEE-488 Connector
12. Pressure Connection, EXHAUST
6.
COM1 Connector
13. Pass Through, ATM REF
7.
COM2 Connector
14. Pressure Connection, VENT
8.
Power Switch
Figure 2. Rear Panel Assembly
2.3.3
POWER CONNECTION
•
Check that the PPC2+ power switch is OFF.
•
Connect the supplied power cable to the rear panel power module.
•
Connect the other end of the power cable to an electrical supply of 85 to 264 VAC,
47 to 440 Hz.
5
10
11
12
6
7
8
9
13
14
PPC2+™ Operation and Maintenance Manual
Page 11
©2001 DH Instruments, Inc.
2.3.4
CONNECTING TO A PRESSURE SUPPLY (SUPPLY PORT)
Using a pressure connecting hose of appropriate pressure rating, connect the pressure supply
to the SUPPLY connection on the rear panel of PPC2+. The PPC2+ SUPPLY connection is
1/8 in. NPT female.
The supply pressure should be equal to the maximum PPC2+ range +10 %. Lower gas
pressure sources can be used but should exceed the maximum desired test output pressure
by 10 to 20 %.
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2.3.5
CONNECTING A VACUUM PUMP (EXHAUST PORT)
For PPC2+ to set pressures under atmosphere and/or to reliably set pressure under
3 psi (20 kPa) gauge other than zero gauge, a vacuum pump must be connected to the
EXHAUST port.
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2.3.6
CONNECTING TO THE DEVICE UNDER TEST (TEST AND TEST(-) PORTS)
If you are using a SPLT, see Section 2.3.6.1 before proceeding to connect the device
under test.
Using a pressure connecting hose of appropriate pressure rating, connect the device or
system to be tested to the TEST port of the PPC2+. The PPC2+ TEST connection is
1/4 in. NPT female.
If PPC2+ is equipped with a gauge RPT (GXXXX), it has a TEST port and a TEST(-) port.
The TEST(-) port is connected to the low side of the gauge RPT. This connection is normally
left open to atmosphere. It can also be connected to the low side of a differential device that
is being calibrated or tested. With very low pressure devices, this will enhance the calibration
results by helping assure that PPC2+ and device under test reference ports are at the
same pressure.
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 12
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2.3.6.1
INSTALLING THE SPLT
The SPLT (optional) is intended to collect and exhaust liquid that may be present in
the device or system under test so that they do not return to contaminate the PPC2+.
The SPLT is installed in the test connection line at a low point between PPC2+ and
the device or system under test. See the SPLT manual for more complete
instructions on SPLT installation.
PPC2+™ Operation and Maintenance Manual
Page 13
©2001 DH Instruments, Inc.
2.3.7
THE VENT CONNECTION (VENT PORT)
The PPC2+ VENT connection is the system vent to atmosphere point used to set zero gauge
pressure as well as to obtain reference pressure transducer measurements of
atmospheric pressure. Though a pressure hose can be connected to the VENT connection to
direct the vented gas flow, a completely unobstructed connection to atmosphere must be
maintained for PPC2+ reference pressure measurements to operate normally.
The PPC2+ VENT connection is 1/4 in. NPT female.
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2.3.8
THE ATM REF PASS THROUGH (UNLABELED)
The ATM REF pass through is connected to the on-board barometer and to the valve that
opens the Lo RPT (if present) to atmosphere when it is not in use. The ATM REF pass
through assures that the Lo RPT and on-board barometer are truly subject to atmospheric
pressure rather than to the pressure inside the PPC2+ case which may be slightly different
from ambient pressure.
.Y XY^ ZV_Q Y\ YL]^\_M^ ^RO +>7
2.4 POWER-UP AND VERIFICATION
2.4.1
SWITCH POWER ON
Actuate the power switch on the PPC2+ rear panel. Observe the front panel display as
PPC2+ initializes, error checks and goes to the main run screen (see Section 3.1.1).
PPC2+ operating condition at power-up is VENT valve closed unless the pressure measured
by the RPT was within 3 psi (20 kPa) of atmospheric pressure.
If the PPC2+ fails to reach the main run screen, service is required. Record the sequences of
operation and displays observed.
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KMMSNOX^KVY`O\Z\O]]_\O]OO=OM^SYX
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 14
2.4.2
CHECK PROPER PRESSURE MEASUREMENT OPERATION
2.4.2.1
CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT
If the PPC2+ has an absolute RPT (designated AXXXX), check that it operates
properly in absolute mode.
If the PPC2+ is not vented (vent LED OFF), press the [VENT] direct pressure control
key to vent the PPC2+ (VENT LED ON) (see Section 3.1.2.2).
Using the [RANGE] function key to change ranges if necessary (see Section 3.2.1)
select a range of the absolute RPT.
Press the [UNIT] function key and select mode. Change the pressure
unit if desired (see Section 3.2.2).
Observe the current value of atmospheric pressure. Check that the value agrees with
the local value of atmospheric pressure. Repeat this process for all the ranges on
both RPTs if the PPC2+ has two absolute RPTs. Check that the values of
atmospheric pressure measured by the different ranges agree with each other within
PPC2+ measurement tolerances (see Section 1.2.2). If they do not agree within
tolerances, PPC2+ may need calibration or repair.
2.4.2.2
CHECKING GAUGE MODE PRESSURE MEASUREMENT
If the PPC2+ is not vented, press the [VENT] direct pressure control key to vent it
(see Section 3.1.2.2).
Press the [UNIT] function key and select mode. Change the pressure unit if
desired (see Section 3.2.2).
Observe that, within ten seconds, zero is indicated. It is normal for PPC2+ to indicate
a value other than zero for up to ten seconds when first entering gauge mode.
Using the [RANGE] function key to change ranges, observe that zero is indicated for
each range within 10 seconds. It is normal for PPC2+ to indicate a value other than
zero when vented when gauge mode is first entered or ranges are changed.
After about ten seconds, the VENT LED should flash and zero should be indicated.
If this does not occur, check that the AUTOZERO function is ON (see Section 3.4.1).
If AUTOZERO is ON and display will not zero when vented, PPC2+ may need repair.
2.4.3
LEAK CHECK
If desired, perform a leak check of the test system (see Section 3.2.8).
PPC2+™ Operation and Maintenance Manual
Page 15
©2001 DH Instruments, Inc.
2.4.4
PURGE
If the SPLT is included and installed in the test line, perform a purge of the Device Under
Test (DUT). This will rid the DUT of contaminated liquids and enable descending pressures to
be controlled (see Section 3.2.8).
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aSVV\O[_S\OXYXaK\\KX^c]O\`SMO
2.4.5
CHECK PROPER PRESSURE CONTROL OPERATION
Select a pressure range using the RANGE function (see Section 3.2.1).
Press the [CONTROL] function key and select (see Section 3.2.3).
Press [ENTER]. Specify a target pressure within the active range and press [ENTER] again
(see Section 3.2.3).
PPC2+ should set the target pressure and indicate Ready (<*>) (see Section 3.1.2.4)
continuously in 15 to 60 seconds. If it does not, see Section 6.
2.5 SHORT TERM STORAGE
The following is recommended for short term storage of PPC2+:
•
Vent the PPC2+ test pressure.
•
Turn the power OFF using the rear panel power switch.
•
Shut OFF or disconnect the pressure supply.
Shut OFF or disconnect the vacuum supply.
PPC2+™ Operation and Maintenance Manual
Page 17
©2001 DH Instruments, Inc.
9:/<+>398
3.1 GENERAL/MANUAL OPERATION
PPC2+ is designed to offer a balance between simple, straight forward operation and the
availability of a wide variety of functions with a high level of operator discretion, if desired.
The local operator interface is through a 2 x 20 display, a 4 x 4 keypad and four direct pressure
control keys.
3.1.1
MAIN RUN SCREEN
The PPC2+ main run screen is its home display that is reached on power-up and from which
other functions and menus are accessed. It is the very top level of all menu structures.
The main run screen is where the operator works with PPC2+ to set and read pressures.
It provides complete information on the system’s current configuration and operating status.
1.
Ready/Not Ready Indication (see Section 3.1.2.4):
<*> when ready, <↑> or <↓> indicating direction of
measured pressure evolution if not ready.
2.
PRESSURE1: Numerical value and sign of pressure
measured by active RPT and range.
3.
UNIT Current unit of measure of pressure indication (see
Section 3.2.2).
4.
Pressure
measurement
mode:
gauge,
absolute (see Section 3.2.2).
5.
Indicates whether a head correction is applied. if
applied, < > (blank) if not (see Section 3.2.7).
6.
Indicates whether the autozero function is ON or OFF. if ON; < > (blank) if OFF (see
Section 3.4.1).
7.
SR: Indicates active RPT ( for high, for low) and range (<1> = low, <2> = mid, <3> = hi)
(see Section 3.2.1).
8.
Used only when running a sequence. Indicates number of current increment over total number of
increments in the sequence or [ENTER] when ready. Changes to countdown time during count
down when next increment of sequence is on timed delay rather than enter.
9.
Pressure control mode ( for static, for dynamic) with a appended if custom control
settings are in use. These control indicator characters flash when the system is controlling.
In static mode, if control is active they flash even if NO valve is operating (e.g., while inside the
hold limit and waiting for stability). Characters flash while controlling pressure down to vent but
NOT when vent valve is open (see Sections 3.2.3 and 3.2.6).
10. PRESSURE2: Numerical sign and value of either target pressure , rate of change of pressure
or deviation from target . Target value and deviation are in the same pressure unit as the
current unit in Step 3 of this section. Rate of change of pressure is in current unit per second (see
Section 3.2.3).
2
3
7
TPRESSURE2 CC NN/NN
7
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 18
11. Indicates whether the number following is target pressure , rate of change of pressure or
current deviation from target value ) (see Section 3.2.3).
Target pressure is indicated when:
•
Dynamic control is active and pressure is Not Ready (<↑> or <↓>)
•
Static control is active and control valves are operating.
Deviation is indicated when:
•
Dynamic control is active and pressure is Ready (<*>).
Rate of change is indicated when:
•
No control is active (e.g., control is suspended or system is vented.)
•
Static control is active, and NO valves are active.
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3.1.2
GENERAL OPERATING PRINCIPLES
3.1.2.1
MAIN 4 X 4 KEYPAD LAYOUT AND PROTOCOL
The PPC2+ has a 4 x 4 keypad for local operator access to direct functions, function
menus and for data entry.
1.
The Function/Data keys allow very commonly
used functions to be accessed directly by a single
keystroke when pressed from the main run screen.
The name of the function is on the bottom half of
the key (see Section 3.2). These keys enter
numerical values when editing.
2.
The Editing and Execution keys are for causing
execution, suspending execution, backing up in
menus and editing entries.
3.
The Menu/Data keys provide access to function
menus when pressed from the main run screen.
The menu name is on the bottom half of the key.
The SETUP menu is for more frequently used
functions (see Section 3.3). The SPECIAL menu is
for functions that are not generally used as a part of
day to day operation (see Section 3.4). These keys
enter numerical values when editing.
Figure 3. Keypad Layout
2
.
SETUP
0
SPECIAL
1
2
LEAK
CHECK
3
ANALOG
4
UPPER
LIMIT
5
SEQ
6
CUSTOM
CONTROL
7
RANGE
8
9
+ / -
ESCAPE
ENTER
CONTROL
3
PPC2+™ Operation and Maintenance Manual
Page 19
©2001 DH Instruments, Inc.
Pressing the [ENTER] key generally causes execution or forward movement in the
menu tree. Pressing [ENTER] from the main run screen allows an automated
pressure control command to be given.
Pressing the [ESCAPE] key moves back in the menu tree and/or causes execution to
cease or suspend. Pressing [ESCAPE] repeatedly always eventually brings you back
to the main run screen and from there will allow a momentary viewing of the PPC2+
introduction screen.
Pressing the [+/-] key changes a numerical sign when editing. It also toggles through
multiple screens when available.
Pressing the [←] and [→] keys allow reverse and forward cursor movement when
editing data entry. They also allow the target pressure value to be jogged up and
down while controlling or when editing target value.
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3.1.2.2
DIRECT PRESSURE CONTROL KEYS
The direct pressure control keys provide direct manual control of pressure increase,
decrease and vent. They can be useful in adjusting pressure when automated
pressure control to a target value is not needed.
The direct pressure control keys interrupt and override automated pressure control.
Pressing the [VENT] key causes PPC2+ to control pressure to near atmospheric
pressure and then open the system vent valve (see Section 5.8.1.7). Vent valve open
is indicated by lighting a RED LED just above the [VENT] key. The vent valve will
remain open until the [VENT] key is pressed again, another direct pressure control
key is pressed, or an automated pressure control command is given. Pressing the
[VENT] key also causes the purge function to execute when the PPC2+ LEAK
CHECK/PURGE function is active (see Section 3.2.8).
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Pressing the [↑] and [↓] keys cause pressure to increase or decrease at the slow
slew rate.
Pressing the [FAST] key while pressing an [↑] or [↓] key will cause the pressure
increase or decrease speed to change from slow to fast.
Figure 4. Direct Pressure Control Keys
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 20
3.1.2.3
AUTOMATED PRESSURE CONTROL
PPC2+ automated pressure control provides automated adjustment and control of
pressure to a user designated target value. This feature allows pressure values to be
set simply and precisely by simple numerical entry. Pressing [ENTER] from the main
run screen allows a pressure control target value to be entered and executed.
Pressing [ESCAPE] or a direct pressure control key will cause pressure control to
be interrupted.
PPC2+ supports two pressure control modes to meet different pressure setting and
controlling requirements: static and dynamic. Pressure control parameters for each
control mode are automatically set to optimal default values for each PPC2+ range
when the control mode is selected in the active range (see Section 3.2.3). If desired,
control parameters can be customized by the user using the CUSTOM CONTROL
function (see Section 3.2.6).
Control parameters:
•
Target Value: The pressure setpoint specified by the operator.
•
Hold Limit: A symmetrical positive and negative limit around the target value
within which the controlled pressure is to be maintained.
•
Stability Limit: A rate of change of pressure limit in units of pressure/second
used as a criterion for the Ready (<*>)/Not Ready (<↑> or <↓>) condition in static
control or when automated control is not active.
See Section 3.1.2.3, Static Control and Dynamic Control for a detailed explanation of
each control mode and its advantages, the default control parameters and the
Custom Control options.
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Static Control
Static control mode is designed to set the pressure near the target value and then
cease active control to allow pressure to stabilize naturally. The advantage of this
control mode is that pressure can be set and/or measured without interference from
a pressure control system. In a system without excessive leaks, the pressure stability
achieved (especially at low pressures) may be greater than the stability with which the
pressure control system can actively control pressure. Using static control to control
pressures near the desired set point and then measuring back the stabilized pressure
without interference of the control function can allow control errors to be eliminated.
However, the final pressure achieved will be different from the target value.
During static pressure control, the hold limit is active. If the pressure goes outside of
the hold limit, a Not Ready (<↑> or <↓>) condition will occur (see Section 3.1.2.4) and
pressure will be readjusted to the target value (see Section 3.2.3 for default hold and
stability limit values and Section 3.2.6 for setting the hold and stability limits to user
defined values).
PPC2+™ Operation and Maintenance Manual
Page 21
©2001 DH Instruments, Inc.
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Figure 5. Static Pressure Control Operation
Dynamic Control
Dynamic control mode is designed to set the pressure to the target value and control
continuously to keep pressure within the hold limit and as close to the target value
as possible. The advantage of this control mode is that the final pressure achieved
will be the same as the target value. However, unlike static control, in dynamic control
a control error will be included in the pressure achieved. The maximum value of the
control error is equal to the hold limit. The average value of the control error is
generally well inside the hold limit.
During dynamic pressure control, the hold limit is active. If the pressure goes outside
of the hold limit, a Not Ready (<↑> or <↓>) condition will occur. See Sections 3.1.2.4
and 3.2.3 for default hold limit values. See Section 3.2.6 for setting the hold limit.
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 22
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Figure 6. Dynamic Pressure Control Operation
3.1.2.4
PRESSURE READY (<*>)/NOT READY (<↑> OR <↓>)
The far left character of the main run screen provides a pressure Ready (<*>)/Not
Ready (<↑> or <↓>) indication. This indication is intended to provide the user with a
clear and objective criterion for determining when a valid pressure measurement can
be made.
Ready (<*>)/Not Ready (<↑> or <↓>) indications are:
•
<*>: Pressure Ready.
•
<↓>: Pressure Not Ready and decreasing.
•
<↑>: Pressure Not Ready and increasing.
When pressure control is NOT active: A Ready (<*>) condition will occur any time
NO control valve is operating and the pressure rate of change is inside the
stability limit. The stability limit is defined in terms of rate of change of pressure in
current pressure units per second.
When pressure control is active: The criteria for determining the Ready (<*>)/Not
Ready (<↑> or <↓>) condition depend on whether the current control mode is static
or dynamic. Pressure Ready (<*>)/Not Ready (<↑> or <↓>) parameters are set by
default when a control mode is selected and or can be customized if desired (see
Sections 3.2.3 and 3.2.6).
PPC2+™ Operation and Maintenance Manual
Page 23
©2001 DH Instruments, Inc.
Static Control Ready (<*>)/Not Ready (<↑> or <↓>)
When static pressure control mode is active a Ready (<*>) condition will occur when:
•
NO control valve is operating.
•
The current measured pressure is inside the hold limit.
•
The rate of change of pressure is less than the current stability limit.
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)/Not Ready (<↑> or <↓>) Static Control Mode
Dynamic Control Ready (<*>)/Not Ready (<↑> or <↓>)
When dynamic pressure control mode is active, a Ready (<*>) condition will
occur when:
•
The current measured pressure is inside the hold limit.
Figure 8. Ready (<*>)/Not Ready (<↑> or <↓>) in
Dynamic Pressure Control Mode
Ready (<*>)/Not Ready (<↑> or <↓>) When Automated Pressure Control is
Not Active
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 24
When NO automated pressure control is active, Ready (<*>) is indicated whenever
the rate of change of pressure is less than the current stability limit.
3.1.2.5
MULTIPLE PRESSURE RANGES
PPC2+ has one or two reference pressure transducers (RPT) each of which has three
ranges for a total of three or six pressure ranges. This multi-ranging feature allows
accuracy to be optimized for the range of pressure in which you are working.
Generally, the best range to select (see Section 3.2.1) is that whose full scale is
closest to, but greater than, the maximum pressure of the device or system
under test.
PPC2+ handles all of the data and internal valving operations needed to make range
changes occur transparently to the operator when the RANGE function is used to
select a range. Ranges available can be viewed at any time, but changing ranges can
only occur when PPC2+ is vented.
When ranges are changed, the upper limit is automatically changed to the default for
that range or to the last upper limit that was set for that range (see Section 3.2.4).
In addition, most other functions and settings are range specific (see Section 3.2.1).
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The PPC2+ internal pneumatic layout for handling two RPTs if two RPTs are
present is:
Figure 9. Hi and Low RPT Pneumatic Circuit
ATM REF
Port
N/C
Valve
N/O
Valve
to
Pneumatic
Module
Hi Ref
Lo Ref
PPC2+™ Operation and Maintenance Manual
Page 25
©2001 DH Instruments, Inc.
Ranges and Identification
The currently active reference transducer and range is continuously displayed in the
upper right hand corner of the main run screen and most other screens. See Table 1
for a complete listing of the RPTs available and their ranges.
Hi RPT: The RPT in a single RPT PPC2+ or the RPT with the highest maximum
range in a dual RPT PPC2+ is referred to as the Hi RPT.
Lo RPT: The RPT with the lower maximum range in a dual RPT PPC2+ is referred to
as the Lo or secondary RPT.
Range 1, 2 or 3: The three ranges of an RPT are referred to as 1 = lo range, 2 = mid
range, 3 = hi range.
Table 5. PPC2+ Range Identification Summary
REFERENCE PRESSURE
TRANSDUCER
AND RANGE
DESIGNATION
DISPLAY SYMBOL *
Lo RPT, Lo range
Lo, 1
L1
Lo RPT, Mid range
Lo, 2
L2
Lo RPT, Hi range
Lo, 3
L3
Hi RPT, Lo range
Hi, 1
H1
Hi RPT, Mid range
Hi, 2
H2
Hi RPT, Hi range
Hi, 3
H3
* The display symbol is included in the upper, right hand corner of most
PPC2+ menu displays as a convenient indicator of active range.
3.2 DIRECT FUNCTION KEYS
3.2.1
RANGE
m PURPOSE
To view and/or change the pressure measurement range.
m PRINCIPLE
Each PPC2+ has three or six ranges (see Section 3.1.2.5).
Pressing the [RANGE] function key allows the ranges to be viewed and selected,
including automated switching of RPTs when necessary, with built-in logic to prevent
accidental overpressure of the Lo RPT if present.
PPC2+ functions and settings such as pressure unit of measure (UNIT), control mode
(CONTROL) and upper limit (UPPER LIMIT) are range specific. Changes made while in
one range apply to that range only and will not affect the other ranges. Only the HEAD
function is not range specific (see Section 3.2.7).
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 26
m OPERATION
Pressing the [RANGE] function key activates the range viewing and selecting function.
Pressing the [+/-] key or the [RANGE] key again while in the RANGE functions steps
through displays of available ranges: Lo to Hi. Pressing [ENTER] while in the RANGE
function when PPC2+ is vented will cause the currently displayed range to become the
active range. Pressing [ESCAPE] while in the range function returns to the main run
screen with no range change having been made.
When the [RANGE] function key is first pressed, the active reference pressure transducer
(RPT) and range are displayed. For example:
1.
Identifies RPT currently in use ( or
). 2. Identifies current range (<1>, <2> or <3>) of the RPT currently in use. 3. Range designator. 4. Full scale pressure value in the current units for the RPT and range number when used in gauge or
absolute mode. If the RPT is a gauge-only RPT,
there is no absolute range indicated.
5.
Units of measure (the units of measure currently active
for this range).
Pressing the [+/-] key or pressing the [RANGE] key again causes the screen to step
through the other available ranges in sequence: Lo to Hi. For example:
1.
Identifies RPT ( or
). 2. Identifies range of the RPT (<1>, <2> or <3>). 3. Range designator. 4. Full scale pressure value in the active units of measure for the RPT and range number when used in gauge
or absolute mode. If the RPT is a gauge-only RPT,
there is no absolute range indicated.
5.
Units of measure (the units of measure currently active
for the range).
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S]MYWZVO^O
2
3
psi 35g/50a
2
3
psi 300g/300a
PPC2+™ Operation and Maintenance Manual
Page 27
©2001 DH Instruments, Inc.
3.2.1.1
RANGE SPECIFIC FUNCTIONS AND SETTINGS
In general, PPC2+ functions and settings are range specific. They are set and stored
for each range so that changing them when in one range does not change them in the
other ranges. When you return to a range, you will find the settings you left.
Functions and settings that are NOT range specific are:
•
Functions: HEAD, ANALOG
•
Setup Menu: <1ControlRef>, <4Drivers>
3.2.2
UNIT
m PURPOSE
To specify the pressure unit and measurement mode in which PPC2+ displays
pressure values.
See also Section 3.4.3.
m PRINCIPLE
PPC2+ allows the pressure measurement unit and mode to be changed.
Internally, PPC2+ always operates in Pascal (Pa), the SI unit of pressure. Values of
pressure are represented in other units by the application of conversion factors to convert
from Pa (see Section 7.3).
RPTs designated AXXXX intrinsically measure absolute pressure relative to an evacuated
and sealed reference. These can also be used to measure in gauge mode by the
subtraction of atmospheric pressure. PPC2+ supports extensive on-board logic and
measurements to assure the precise atmospheric compensation of absolute RPTs to
deliver gauge measurements (see Section 3.4.1). This allows simple, one step switching
between gauge and absolute measurement modes by the operator without special
procedures or hardware. RPTs designated GXXXX intrinsically measure gauge pressure
and can be used in gauge pressure measurement mode only.
m OPERATION
To
change
the
pressure
unit
and/or
the
measurement mode, press the [UNIT] function key.
The display is:
Select <1> to change pressure units or <2> to change measurement mode. If a
measurement mode change is not currently possible (if the active RPT is gauge only or if
the current pressure unit is an altitude unit which can only be absolute), the <2mode>
selection is not offered.
If <2mode> was selected the next screen offers the choice between <1gauge>
and <2absolute>. Making a selection returns to the main run screen with the selected
measurement mode active.
1unit 2mode
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 28
If <1unit> was selected from the measurement screen, the units screen is presented.
The cursor will be on the number corresponding to the
active unit for the active range. To change the pressure
unit for the active range, select the desired unit.
Pressing [ENTER] activates the unit and returns to the
main run screen.
If the pressure unit selected is inWa, the reference
temperature for water density must be specified.
When inWa is selected as the unit, the next display is:
Select the desired reference temperature for water density using the [←] or [→] key to move
the cursor. Pressing [ENTER] returns to the main run screen with inWa based on water
density at the selected reference temperature as the pressure unit. The current inWa
reference temperature can be viewed by observing the position of the cursor in the reference
temperature screen.
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PPC2+™ Operation and Maintenance Manual
Page 29
©2001 DH Instruments, Inc.
3.2.3
CONTROL
m PURPOSE
To set the automated pressure control mode for the currently active range and activate
default control parameters.
m PRINCIPLE
The CONTROL function allows the active control mode for the current range to be set to
either static control or dynamic control (see Section 3.1.2.3). The control mode set is
specific to the active range and will be maintained with that range when ranges
are changed.
When the control mode is set using the CONTROL function, CONTROL parameters are
set to system default parameters. The default control parameters have been determined
to be those most suitable for the typical user to operate within PPC2+ pressure control
and measurement specifications (see Section 3.2.3.1). If desired, control mode
parameters can be customized using the CUSTOM CONTROL function (see
Section 3.2.6).
For a complete description of the operation and purpose of static and dynamic control
modes (see Section 3.1.2.3).
m OPERATION
To select the control mode for the currently active
range and set control parameters to the default
control parameters, press the [CONTROL] function
key from the main run screen. The display is:
Selecting <1static> or <2dynamic> causes the selected pressure control mode to be
activated with default control parameters and returns to the main run screen.
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Active Range
1dynamic 2static
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 30
3.2.3.1
SYSTEM DEFAULT CONTROL PARAMETERS
Table 6. Lo or Hi Reference Transducer Range 1, 2, 3
HOLD LIMIT
STABILITY LIMIT
STATIC
MODE
± 1 % FS of the active pressure measurement
range
± 0.005 % FS/sec of the active pressure
measurement range.
DYNAMIC
MODE
± 0.005 % FS of the active range or ± 2 ppm
FS of range H3, whichever is larger
± 0.005 % FS/sec of the active pressure
measurement range
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1
3.2.3.2
EXECUTING AUTOMATED PRESSURE CONTROL COMMANDS
m PURPOSE
To use the automated pressure control functions of PPC2+ to set target
pressure values.
m OPERATION
To set a pressure, press [ENTER] from the main run screen. The display is:
1.
Ready (<*>)/Not Ready (<↑>) or <↓>) indication,
current pressure, units, measurement mode,
range (regular first line of main run screen).
2.
Entry field for target pressure value to be set
automatically. Comes up with last entry or zero if
pressure
measurement
units
have
been
changed, range has been changed, or system
has been vented.
Use the numerical keys and editing keys to enter the target pressure value
desired (see Section 3.2.3.2.2) for information on zero pressure commands.
Also, the [←] and [→] keys can be pressed to jog the current target pressure
value displayed down or up by the current pressure control hold limit.
Press [ENTER] to start pressure control to the target pressure and return to the
main run screen. The main run screen is:
1.
Ready (<*>)/Not Ready (<↑> or <↓>) indication,
current pressure, units, measurement mode,
range (regular first line of main run screen).
2.
Current control mode indicator: Flashes when
automated pressure control is ON. for
dynamic control, for static control with
added if custom control parameters are in use.
3.
Target pressure value when controlling and
in Not Ready (<↑> or <↓>) condition; pressure
rate of change value when in static control
mode and waiting for stability; current deviation
from the target value when in dynamic
control mode and Ready (<*>) condition.
2
Target:135.000
2
3
T 250.000 DC
PPC2+™ Operation and Maintenance Manual
Page 31
©2001 DH Instruments, Inc.
Observe the Ready (<*>)/Not Ready (<↑> or <↓>) indication for indication of
when ready conditions have been satisfied (see Section 3.1.2.4). PPC2+ will
continue controlling following static or dynamic control operation protocol (see
Section 3.1.2.3) until automated pressure control is interrupted.
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Interrupting Automated Pressure Control
Automated pressure control is interrupted by:
•
Pressing [ESCAPE]: Suspends control and remains in main run screen.
•
Pressing any direct pressure control key (see Section 3.1.2.2): Suspends control
and executes direct pressure control.
•
Pressing any function key: Suspends control and goes to the selected function.
•
Pressing [ENTER]: Suspends control and goes to ENTER target pressure
value screen.
To resume automated pressure control, press [ENTER] and insert a target
pressure value.
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 32
Automated Pressure Commands for Zero Pressure
Zero in
gauge
mode:
A command for automated pressure control to a target value of
zero when in gauge pressure measurement mode is interpreted
in the same manner as if the [VENT] direct pressure control key
had been pressed (see Section 3.1.2.2). A Ready (<*>) condition
will occur when the vent valve has been opened and the pressure
meets the current stability test.
Zero in
absolute
mode:
When attempting to set a target pressure of zero in absolute
measurement mode, PPC2+ opens its down control valves fully
and closes a bypass interrupt valve to interrupt the natural flow of
gas out the EXHAUST port through its pressure regulators once
pressure is under 3.5 psia (25 kPa). However, even with a vacuum
pump connected to its EXHAUST port, there is a limit to how low
the pressure in PPC2+ can be pulled down. This is a function of
the quality of the vacuum pump used, the characteristics of the
volume connected to the TEST port and PPC2+’s internal
restrictions. When a command for automated pressure control to a
target value of zero is given when in absolute pressure
measurement mode, PPC2+ responds by reducing the pressure
as far as possible using down fast pressure control. A Ready (<*>)
condition will be indicated when the stability limit is reached and the
control down fast valve will remain open keeping the vacuum pump
connected to the PPC2+ pneumatic module and TEST port. When
pressure control is suspended or a non-zero pressure target is
executed, the bypass interrupt valve is opened.
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_XNO\^O]^
AROX::- S]QS`OXKMYWWKXN^Y]O^dO\YSXKL]YV_^OWOK]_\OWOX^WYNO^RO\K^O
YP MRKXQO YP Z\O]]_\O aSVV NOM\OK]O K] ^RO Z\O]]_\O NOM\OK]O] KXN ^RO \K^O aSVV
O`OX^_KVVcLOXOK\dO\YaROX^RO`KM__WZ_WZRK]Z_VVONNYaX^ROZ\O]]_\OSX^RO
::- KXN ^RO ^O]^ `YV_WO K] PK\ K] ZY]]SLVO >Y WKUO LO]^ _]O YP ^RO
ZY\^RK]\ON_MONZ\O]]_\OK]PK\K]ZY]]SLVO
PPC2+™ Operation and Maintenance Manual
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©2001 DH Instruments, Inc.
3.2.4
UPPER LIMIT
m PURPOSE
To set the upper limit pressure value for a pressure range and measurement mode.
m PRINCIPLE
The UPPER LIMIT function allows the setting of a maximum pressure not to be exceeded
when using a specific range and measurement mode. Automated pressure control target
values above the upper limit will not be accepted and direct pressure control keys will shut
off when the upper limit is reached.
Upper limit settings are specific to each range and measurement mode (gauge
or absolute).
The UPPER LIMIT function is most often used to protect the device or system connected
to the PPC2+ TEST port from accidental overpressure.
3P XY _ZZO\ VSWS^ `KV_O S] OX^O\ON Lc ^RO _]O\ ^RO _ZZO\ VSWS^ PY\ OKMR \KXQO KXN
WOK]_\OWOX^WYNOS]]O^LcNOPK_V^^Y YPOKMR\KXQOKXNWOK]_\OWOX^WYNOPY\
\KXQO]6 KXN2 KXN^Y YPOKMR\KXQOKXNWOK]_\OWOX^WYNOPY\KVVY^RO\\KXQO]
m OPERATION
When the [UPPER LIMIT] function key is pressed from the main run screen the display is:
1.
Entry field to enter desired upper limit value.
Enter the desired upper limit value and PPC2+ returns to the main run screen with a new
upper limit value active.
When the UPPER LIMIT has been exceeded, the display of current pressure flashes and
a buzzer sounds for 3 seconds every 2 seconds. Reduce pressure using direct pressure
control keys or an automated pressure command to return to normal operation.
?ZZO\VSWS^`KV_O]K\O]ZOMSPSM^YOKMR\KXQOKXNWOK]_\OWOX^WYNO,OMK\OP_VXY^^Y
K]]_WO ^RK^ ^RO _ZZO\ VSWS^ ]O^ SX YXO WOK]_\OWOX^ WYNO aSVV KZZVc ^Y ^RO Y^RO\
0Y\ObKWZVOSPcY_]O^!Z]SK]^RO_ZZO\VSWS^SXKL]YV_^OWYNO^RO_ZZO\VSWS^aSVVXY^
LO!Z]SKK^WY]ZRO\SMZ\O]]_\OSXQK_QOWYNO>ROQK_QOWYNO_ZZO\VSWS^PY\^RK^
\KXQOaSVV]^SVVLO^RONOPK_V^VSWS^Y\KXY^RO\VSWS^^RK^RK]LOOX]O^SXQK_QOWYNO
?ZZO\VSWS^]K\OKVaKc]]ZOMSPSONKXNNS]ZVKcONSX^ROM_\\OX^Z\O]]_\O_XS^ObMOZ^PY\
KV^S^_NO_XS^]AROXSXKV^S^_NO_XS^]_ZZO\VSWS^]K\OObZ\O]]ONSXU:KSP^ROKV^S^_NO_XS^
S]WO^O\]WKXNZ]SSP^ROKV^S^_NO_XS^S]POO^P^
::- RK]?::/<KXN69A/<VSWS^]XY^T_]^KX?::/<6373>=OO^RO::- ,1
9ZO\K^SYXKXN7KSX^OXKXMO7KX_KV
105 psi a
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 34
3.2.4.1
OVERPRESSURE FUNCTION
In addition to the UL function, PPC2+ has an overpressure function. This function
executes when the maximum RPT range is exceeded by 25 %. The function causes
all pressure control to be interrupted and disabled, changes the range to H3 and
causes the display to flash. The overpressure function also logs the time and date of
the overpressure condition to assist in incident diagnosis. To recover from an
overpressure condition, cycle PPC2+ power.
3.2.5
SEQ
m PURPOSE
To execute a programmed sequence of automated pressure control target values:
Either a to run in the current range with all current settings or a
specifying the range and settings to use.
m PRINCIPLE
The sequence function is intended to facilitate the execution of a series of pressure
control target values such as is commonly needed when PPC2+ is used to run a typical
calibration sequence on a device or system being tested.
There are two types of sequences:
•
Quick Sequence (see Section 3.2.5.1) allows quick definition and execution of a
sequence in the current range and using all of the current settings (e.g., pressure
units, control mode, control settings).
•
File Sequence (see Section 3.2.5.2) allows execution of a preprogrammed sequence
script including the PPC2+ range to use, measurement mode, control mode, target
values and other operational settings.
m OPERATION
When the [SEQ] function key is pressed from the
main run screen, the display is:
Select the sequence type desired. See Section 3.2.5.1 for quick sequence or
Section 3.2.5.2 for file sequence set ups. See Section 3.2.5.3 for running a sequence.
3.2.5.1
SETTING UP/EDITING A QUICK SEQUENCE
m OPERATION
When <1Quick> is selected from the SEQ
function menu, the display is:
This selection provides the choice between running the quick sequence that is
currently set up or changing the quick sequence set up. Selecting <1Yes> will cause
the currently defined quick sequence to run (see Section 3.2.5.3). Selecting <2No>
will go to the quick sequence set up/edit routine.
1quick 2file
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©2001 DH Instruments, Inc.
When <2No> is selected from the Run Current Quick Sequence menu, the set-up/edit
routine is accessed. The first display is:
1.
Entry field for sequence full scale value. Recalls
value last entered.
This entry determines the maximum pressure (furthest from zero) of the quick
pressure sequence. Enter the desired sequence maximum pressure and
press [ENTER].
=O[_OXMO 0= W_]^ LO VO]] ^RKX ^RO Z\O]]_\O _ZZO\ VSWS^ YP ^RO M_\\OX^Vc KM^S`O
Z\O]]_\O \KXQO Y\ KX O\\Y\ aSVV YMM_\ aROX K^^OWZ^SXQ ^Y \_X ^RO ]O[_OXMO ]OO
=OM^SYX >Y\_XK]O[_OXMOSXMV_NSXQKZ\O]]_\OQ\OK^O\^RKX^ROM_\\OX^_ZZO\
VSWS^SXM\OK]O^RO_ZZO\VSWS^LOPY\O\_XXSXQ^RO]O[_OXMOY\MRKXQO^YKRSQRO\\KXQO
SPK`KSVKLVO
The next display is:
1.
Entry field for sequence pressure increment in %
of full scale. Recalls last value entered.
This selection determines the size of the pressure increment in terms of % of the full
scale (FS) value entered in the previous screen. The sequence will run between zero
and full scale in pressure steps of (full scale x increment %) starting from zero and
ending with the uneven increment if applicable. Enter the desired pressure increment
and press [ENTER].
The next display is:
This selection determines the order in which the sequence increments will execute.
Selecting <1Up> will cause the sequence to execute starting at zero and going to the
full scale value.
Selecting <2Down> will cause the sequence to execute starting at the full scale value
and going to zero.
Selecting <3Both> will cause the sequence to execute from zero to full scale and
back to zero.
After making the increment order selection the
next display is:
This selection determines under what conditions, when the sequence is run, the
pressure target value will change to the next value in the sequence. If <1ENTER> is
selected, the sequence will proceed to the next target value whenever, and only
whenever, [ENTER] is pressed.
100 psi a
increment: 20 % FS
1Up 2Down 3Both
1ENTER 2Timer
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©2001 DH Instruments, Inc.
Page 36
If <2Timer> is selected, a timer will be started each time a pressure Ready (<*>)
condition is achieved (see Section 3.1.2.4) and the sequence will continue to the next
pressure control target value without operator intervention once the timer has expired.
After selecting <2Timer>, an additional screen is presented for entry of the timer
value in seconds (minimum 1, maximum 999).
After making the next increment on selection the next display is:
1.
Indication of maximum (furthest from zero)
pressure included in the sequence which is about
to run.
Press [ENTER] to run the quick sequence that has just been set up/edited (see
Section 3.2.5.3). Press [ESCAPE] to return to the main run screen without running
a sequence.
3.2.5.2
SETTING UP/EDITING A FILE SEQUENCE
Setting up and editing file sequences is done by pressing [SETUP] and selecting
<3Sequence> (see Section 3.3.3).
3.2.5.3
RUNNING A SEQUENCE
m PURPOSE
Selecting <1Yes> in the Run current quick sequence menu causes the current
quick sequence to execute.
Entering a valid sequence file number from the Run Sequence File # menu
causes a file sequence to execute.
A Quick Sequence executes in the current range with the current settings. A File
Sequence sets up the range and other settings as specified in the sequence file
(see Sections 3.2.5 and 3.3.3).
AROXSXS^SKVSdSXQObOM_^SYXYPK[_SMU]O[_OXMO::- MROMU]$KSP^RO]O[_OXMO
P_VV ]MKVO Z\O]]_\O S] aS^RSX ^RO M_\\OX^ _ZZO\ VSWS^% L SP ::- S] SX KL]YV_^O
WOK]_\O WYNO ^RK^ ^RO ]O[_OXMO NYO] XY^ MYX^KSX XOQK^S`O `KV_O] 3P OS^RO\
MYXNS^SYXS]XY^WO^KXO\\Y\WO]]KQOaSVVLONS]ZVKcONKXN^RO]O[_OXMOaSVVXY^
LO\_X
>Y\_XKPSVO]O[_OXMO^RK^]ZOMSPSO]K<:>\KXQOY^RO\^RKX^ROM_\\OX^\KXQO
::- W_]^ LO `OX^ON LOMK_]O ^RO \KXQO MKXXY^ LO MRKXQON aROX ::- S]
XY^`OX^ON
>Y\_XKPSVO]O[_OXMO^RO]O[_OXMOPSVOX_WLO\]OVOM^ONW_]^KV\OKNcRK`OLOOX
]O^_ZLcZ\O]]SXQE=/>?:GKXN]OVOM^SXQ& =O[_OXMO(]OO=OM^SYX
100 psi a FS
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©2001 DH Instruments, Inc.
m OPERATION
The first display is:
1.
Indication of maximum (furthest from zero)
pressure included in the sequence which is about
to run.
This screen is offered as a means for the user to check, prior to execution, that
the correct sequence is selected and that it does not exceed the range of the
device or system being tested. Pressing [ESCAPE] returns to the main run
screen without sequence execution. Pressing [ENTER] causes sequence
execution to proceed.
Pressure control will begin to set the first target value of the sequence (or vent will
execute if the first increment is zero gauge pressure or a vent command).
The display is the Main Run Screen (see Section 3.1.1) with indication of the
sequence progress:
1.
Indication of sequence increment that is currently
being controlled/total increments in sequence.
Changes to ENTER or countdown time remaining
once Ready (<*>) condition has been reached at
target value.
Except for the bottom right hand corner, the sequence run display is identical to
the normal main run screen (see Section 3.1.1). The bottom right corner provides
information on sequence execution. This information updates as each sequence
increment is executed.
If the sequence was set up with , execution
will proceed automatically from increment to increment after a Ready <*>
condition has occurred at the increment and the countdown timer has expired.
If the sequence was set up with . Press [ENTER]
to continue to the next increment.
/<Z\O]]SXQE/8>/RS] POK^_\O MKX LO _]ON ^Y ]USZ YXO Y\ ]O`O\KV SXM\OWOX^]
SPNO]S\ON
To interrupt the sequence, press [ESCAPE].
Pressure control will immediately cease and
the display will go to:
100 psi a FS
TPRESSURE2 CC NN/NN
1yes 2no
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 38
Selecting <1Yes> causes the sequence to abort and returns to the main
run screen. Selecting <2No> causes the sequence to resume where it left off.
+VV;_SMU=O[_OXMO]OXNaS^RK@/8>MYWWKXNKP^O\^ROVK]^ZYSX^>YK`YSN^RO
@/8>Z\O]]E/=-+:/GKP^O\^ROVK]^ZYSX^
3.2.6
CUSTOM CONTROL
m PURPOSE
To customize the control parameters of the current automated pressure control mode for
the current range.
m PRINCIPLE
Automated pressure control and the associated pressure Ready (<*>)/Not Ready (<↑> or
<↓>) condition are characterized by hold limit and stability limit parameters which
determine how PPC2+ will control and under what conditions a Ready (<*>) indication will
occur (see Sections 3.1.2.3 and 3.1.2.4).
PPC2+ provides system default values for the hold limit and stability limit parameters for
each range which have been determined to be those most suitable for the typical user to
operate within PPC2+ pressure control and measurement specifications. The default
parameters are automatically set each time the control mode is selected using the
[CONTROL] function key (see Table 7).
The CUSTOM CONTROL function allows the hold and stability limit parameters to be
adjusted by the user. This can be used to increase control speed (time to Ready (<*>)),
usually by decreasing control precision, or to increase precision which usually decreases
control speed (see Section 3.1.2.4). For example, changing the dynamic pressure control
hold limit from its default value of ± 0.005 % FS of the current range to ± 0.01 % FS of the
current range will decrease the time required to set a pressure (achieve a Ready (<*>)
condition) since the limit in which the pressure must be set has increased by a factor of
two but it will also increase by a factor of two the maximum possible control error included
when Ready (<*>) is indicated.
+NT_]^SXQNOPK_V^MYX^\YVZK\KWO^O\]_]SXQ^RO-?=>97-98><96P_XM^SYXWKc\O]_V^SX
MYX^\YVZK\KWO^O\]^RK^^RO::- S]_XKLVO^YWOO^]Y^RK^KRS]NYO]XY^SXNSMK^O::- WKVP_XM^SYXT_]^^RK^^ROMYX^\YVZK\KWO^O\]
XOON^YLO\OVKbONY\]O^LKMU^YNOPK_V^ZK\KWO^O\]
PPC2+™ Operation and Maintenance Manual
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©2001 DH Instruments, Inc.
Table 7. System Default Control Parameters
Lo REFERENCE TRANSDUCER
RANGE 1, 2, 3
Hi REFERENCE TRANSDUCER
RANGE 1, 2, 3
HOLD LIMIT
STABILITY LIMIT
HOLD LIMIT
STABILITY LIMIT
STATIC
MODE
± 1 % FS of the active
pressure range
± 0.005 % FS/sec
of the active
pressure range
± 1 % FS of the
active pressure
range
± 0.005 % FS/sec
of the active
pressure range.
DYNAMIC
MODE
± 0.005 % FS of the
active pressure range or
± 2 ppm of range H3,
whichever is larger
± 0.00 % of the
active pressure
range
± 0.005 % FS of
the active
pressure range
± 0.005 % FS of
the active pressure
range
m OPERATION
To set custom control parameters, press the [CUSTOM CONTROL] key from the main
run screen. The display is:
1.
Current reference transducer ( for high, for
Lo) and range (<1>, <2> or <3>).
2.
Current control mode ( for static, for
dynamic).
3.
Entry field for setting the desired hold limit. Recalls
the default hold limit or the last custom hold limit set
for the currently active range.
Enter the desired hold limit. The next display is:
1.
Current reference transducer ( for high, for
Lo) and range (<1>, <2> or <3>).
2.
Current control mode ( for static, for
dynamic).
3.
Entry field for setting the desired stability limit.
Recalls the default stability limit or the last custom
stability limit for the currently active range.
Enter the desired stability limit. The display returns to the main run screen with the
custom control parameters active.
>Y \O]O^ NOPK_V^ MYX^\YV ZK\KWO^O\] PY\ K \KXQO KXN MYX^\YV WYNO ]OVOM^ ^RO MYX^\YV
WYNO_]SXQ^RO-98><96P_XM^SYXaRSVOSX^RK^\KXQO
-_]^YWMYX^\YVZK\KWO^O\]K\O\KXQOKXNMYX^\YVWYNO]ZOMSPSM-RKXQO]WKNOSXYXO
\KXQOKXNMYX^\YVWYNOK\O]^Y\ONPY\^RK^\KXQOKXNMYX^\YVWYNOKXNaSVVLO\OMKVVON
aROX^RK^\KXQOKXNMYX^\YVWYNOS]\O^_\XON^Y-RKXQO]WKNOSXYXO\KXQOKXNMYX^\YV
WYNONYXY^KPPOM^KXcY^RO\\KXQOKXNMYX^\YVWYNO
AROX M_]^YW MYX^\YV ZK\KWO^O\] K\O KM^S`O K - S] KZZOXNON ^Y ^RO MYX^\YV WYNO
SXNSMK^SXQMRK\KM^O\&=(PY\]^K^SM&.(PY\NcXKWSMSX^ROWSNNVOYP^ROLY^^YWVSXOYP
^ROWKSX\_X]M\OOX
3
0.005 psi D
3
0.005 psi D
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 40
3.2.6.1
TURNING-OFF CUSTOM CONTROL PARAMETERS
To return to default pressure control parameters for the active range and control
mode, select the control mode using the CONTROL function (see Section 3.2.3).
3.2.7
HEAD
m PURPOSE
To cause a pressure value representing a difference in height to be added to the pressure
measured by the PPC2+ reference pressure transducer.
m PRINCIPLE
PPC2+’s reference pressure transducers measure gauge or absolute pressure at the
height of the rear panel TEST port. Frequently, when performing a calibration or test, the
device or system under test is at a different height than the PPC2+’s TEST port.
This difference in height, frequently called head, can cause a significant difference
between the pressure measured by the PPC2+ at its TEST port height and the pressure
actually applied to the device under test which is at a different height. In this case, it is
useful to make a head correction to the pressure measured by the PPC2+ RPT at its test
port in order to accurately predict the pressure actually applied at a different height.
PPC2+ can accurately calculate head pressures for nitrogen, helium and air as the test
gas over its working pressure range. The HEAD function allows the height difference to
be specified and causes the resulting head pressure to be added to the pressure
measured at the TEST port.
The [HEAD] function key is used to turn the head correction function ON and OFF and to
specify the height difference between the PPC2+ TEST port and another height.
The height units and the test gas are specified under by pressing [SPECIAL] and
selecting <2Head> (see Section 3.2.7).
?]OYP^RO2/+.P_XM^SYX^YK]]_\OSX^YVO\KXMOWOK]_\OWOX^]S]WY]^SWZY\^KX^SXVYa
KL]YV_^OZ\O]]_\O\KXQO]=ZOMSPcSXQ^ROROKNROSQR^aS^RSXÝ SX MWS]KNO[_K^O
^Y K]]_\O ^RK^ O`OX SX ^RO aY\]^ MK]O ^RO _XMO\^KSX^c YX ^RO ROKN MY\\OM^SYX aSVV LO
SX]SQXSPSMKX^\OVK^S`O^Y^RO^YVO\KXMOYX^ROWOK]_\OWOX^
PPC2+™ Operation and Maintenance Manual
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©2001 DH Instruments, Inc.
m OPERATION
To access the HEAD function, press the [HEAD] function key. The display is:
1.
Test gas currently specified for the head correction.
2.
Entry field for head height.
Entering a value of zero turns the HEAD function OFF. Entering a value other than zero
turns the HEAD function ON using the height entered. Pressing [ESCAPE] returns to the
main run screen with no change to the current head setting.
>RO2/+.P_XM^SYXS]89>\KXQO]ZOMSPSM>RO2/+.98Y\900]^K^_]\OWKSX]^RO]KWO
K]\KXQO]K\OMRKXQON/NS^]WKNO^Y^ROROKN]ZOMSPSMK^SYX]K\OSXNOZOXNOX^YP\KXQO
AROX^RO2/+.P_XM^SYXS]98ROKN`KV_O3^S]SXNSMK^ONLc&R(SX^RO^YZVSXOYP
^RO WKSX \_X ]M\OOX ]OO =OM^SYX AROX ^RO 2/+. P_XM^SYX S] 900 ^RO &R( S]
XY^]RYaX
>YMRKXQO_XS^]YPROKNROSQR^LO^aOOXSXMRO]KXNMOX^SWO^O\]KXN^YMRKXQO^RO^O]^
QK]]ZOMSO]Z\O]]E=:/-3+6GKXN]OVOM^& 2OKN(]OO=OM^SYX !
>RO \OPO\OXMO ROSQR^ YP ^RO ::- Z\O]]_\O WOK]_\OWOX^ S] ^RO WSNNVO YP ^RO ::-
>/=>ZY\^>ROROKNROSQR^]RY_VNLOOX^O\ONK]KZY]S^S`O`KV_OSP^RONO`SMOY\]c]^OW
_XNO\^O]^S]RSQRO\^RKX^RO::- KXNXOQK^S`OSPS^S]VYaO\
3.2.8
LEAK CHECK/PURGE
m PURPOSE
The [LEAK CHECK] function key accesses two functions:
•
The LEAK CHECK function to assist in checking the pressurized connections and
device or system under test connected to the PPC2+ TEST port for leaks (see
Section 3.2.8.2).
•
The PURGE function to use the optional Self Purging Liquid Trap (SPLT) to collect
and exhaust liquid contaminants from the device or systems under test before they
reach the PPC2+ (see Section 3.2.8.3).
95 cm N2
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 42
m PRINCIPLE
Leaks in the test system can have a detrimental effect on measurement accuracy and,
when large enough, can cause the PPC2+ to be unable to set and control
pressures reliably. The LEAK CHECK function is provided as a means of checking and
quantifying the leaks that may be present in the system.
PPC2+ is designed to precisely set, control and measure gas pressures.
Liquid contamination of the PPC2+ internal pneumatic control module and reference
pressure transducers can cause poor pressure control and interfere with accurate
pressure measurement. Liquid contaminants that may be present in test devices or
systems that are connected to the PPC2+ TEST port are likely to make their way back to
PPC2+’s internal pneumatic system as the test device or system is pressurized and
depressurized by PPC2+. To every extent possible, only clean hoses and connections
should be used in connecting PPC2+ to test devices or system and those devices and
systems should be free of liquid contaminants. However, in the event that PPC2+ will
need to be used to test some devices or systems that contain small amounts of liquid
contaminants, a Self Purging Liquid Trap (SPLT) accessory supported by the PURGE
function is available.
As the LEAK CHECK and PURGE functions are generally performed together at the
beginning of a test and there are commonalties to the procedures, PPC2+’s LEAK and
PURGE functions are designed to operate together under the single [LEAK CHECK]
function key.
m OPERATION
To access the LEAK CHECK/PURGE function, from the main run screen press the
[LEAK CHECK] function key. The function can be accessed directly at any pressure in
any range. The first screen is the leak check screen (see Section 3.2.8.2).
3.2.8.1
LEAK CHECK/PURGE MENU AND FUNCTIONS FLOW CHART
The flowchart of the LEAK CHECK/PURGE menu and functions is shown in
Figure 10.
PPC2+™ Operation and Maintenance Manual
Page 43
©2001 DH Instruments, Inc.
Figure 10. Leak Check/Purge Menu Flow Chart
>RO :?<1/ P_XM^SYX W_]^ RK`O LOOX OXKLVON Lc Z\O]]SXQ E=:/-3+6G KXN ]OVOM^SXQ
& 3X^O\XKV( &":_\QO( ]OO =OM^SYX " PY\ ^RO :?<1/ P_XM^SYX ^Y ObOM_^O
3P^RO:?<1/P_XM^SYXRK]XY^LOOXOXKLVON^ROE@/8>GNS\OM^Z\O]]_\OMYX^\YVUOc
aSVVLORK`OXY\WKVVcP\YW^ROVOKUMROMU]M\OOX
3.2.8.2
LEAK CHECK SCREEN
The leak check screen appears when the [PURGE/LEAK CHECK] function key has
been pressed from the main run screen.
1.
Current measured pressure and pressure units.
2.
Active reference pressure transducer and range.
3.
Current rate of change of pressure (leak rate) in
current pressure units/minute (updated every
10 seconds).
4.
Current rate of change of pressure (leak rate) in
current pressure units/second.
This screen is for observing the current leak rate. Pressing [ESCAPE] returns to the
main run screen.
MAIN RUN
SCREEN
LEAK CHECK
SCREEN
/=-+:/
@/8>
/8>/<
:?<1/6/+5
MAIN RUN
SCREEN
PURGE
FUNCTION
IF PURGE
ACTIVE
SET PRESSURE
FUNCTION
2
3
0.001/s 0.06/m
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©2001 DH Instruments, Inc.
Page 44
If the PURGE function is enabled (see Section 3.4.4.8), pressing [VENT] when in the
leak check screen causes the PURGE function to execute (see Section 3.2.8.3).
Pressing [ENTER] when in the leak check screen goes to the set pressure screen
(see Sections 3.2.3.1 and 3.2.8.4).
3XQOXO\KV^ROWKbSW_WKMMOZ^KLVOVOKU\K^OPY\YZ^SWKV::- K_^YWK^ONZ\O]]_\O
MYX^\YV YZO\K^SYX KXN ^Y K]]_\O SX ^YVO\KXMO WOK]_\OWOX^] aS^R NOPK_V^ Z\O]]_\O
MYX^\YVZK\KWO^O\]S]YPM_\\OX^\KXQO0=WSX_^O3XNcXKWSMMYX^\YVWYNO^Y
RKXNVORSQRO\^O]^]c]^OWVOKU\K^O]SXM\OK]O^RORYVNVSWS^_]SXQ-?=>97-98><96
]OO=OM^SYX
-RKXQSXQ^ROZ\O]]_\OSX^RO^O]^]c]^OWMK_]O]KNSKLK^SM^OWZO\K^_\OMRKXQO]SX
^ROQK]^RK^XOON^YRK`ONS]]SZK^ONLOPY\OK`KVSNVOKUWOK]_\OWOX^MKXLOWKNO
3XQOXO\KVK ^YWSX_^OaKS^NOZOXNSXQYX^ROWKQXS^_NOYP^ROZ\O]]_\OMRKXQO
KXN ^RO ]SdO YP ^RO ^Y^KV Z\O]]_\SdON `YV_WO S] KNO[_K^O ^Y KVVYa ^RO KNSKLK^SM
^OWZO\K^_\OMRKXQO^YNS]]SZK^OKXN`KVSNVOKUWOK]_\OWOX^]^YLOWKNO
3.2.8.3
PURGE FUNCTION
0Y\^ROZ_\QOP_XM^SYX^YYZO\K^O^RO:?<1/P_XM^SYXW_]^LOOXKLVONLcZ\O]]SXQ
E=:/-3+6GKXN]OVOM^SXQ& 3X^O\XKV(&":_\QO(]OO=OM^SYX "KXNKXYZ^SYXKV
=OVP:_\QSXQ6S[_SN>\KZ=:6>W_]^LOMY\\OM^VcSX]^KVVONSX^ROVSXOMYXXOM^SXQ^RO
::- >/=>ZY\^^Y^RONO`SMOY\]c]^OW_XNO\^O]^]OO=OM^SYX
>RO:?<1/P_XM^SYXWKUO]_]OYP^RO::- `KV`ON\S`O\YZ^SYX@KV`ON\S`O\X_WLO\
"S]_]ON^YKM^_K^O^RO=:6>ObRK_]^`KV`O>RO=:6>ObRK_]^`KV`O3]KM^_K^ON
aROX ZO\PY\WSXQ ^RO :?<1/ P_XM^SYX KXN SX ^RO LKMUQ\Y_XN O`O\c ^SWO ^RO ::-
`OX^`KV`OS]YZOXONAROXWKUSXQ_]OYP`KV`ON\S`O\]XY^O^RK^aROX^RO:?<1/
P_XM^SYX S] OXKLVON `KV`O N\S`O\ X_WLO\ " aSVV LO KM^_K^ON SXNOZOXNOX^Vc YP `KV`O
N\S`O\MYWWKXN]
If the PURGE function is enabled (see Section 3.4.4.8), pressing the [VENT] direct
pressure control key (see Section 3.1.2.2) from the LEAK CHECK screen will cause
the PURGE function to execute.
Execution of the PURGE function is automated and proceeds as follows:
•
If current pressure is greater than 100 psi (700 kPa) gauge, pressure is controlled
down to less than 100 psi (700 kPa) gauge.
>ROZ_\QOP_XM^SYX]RY_VNLOObOM_^ONP\YW\Y_QRVcP_VV]MKVOYP^RONO`SMOY\]c]^OW
_XNO\ ^O]^ Y\ < Z]S 7:K aRSMRO`O\ S] VYaO\ +`YSN ObOM_^SXQ ^RO :?<1/
P_XM^SYXP\YWZ\O]]_\O]KLY`O Z]S7:K
PPC2+™ Operation and Maintenance Manual
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©2001 DH Instruments, Inc.
•
Pressure control stops and a 5 second wait occurs.
•
SPLT exhaust valve is opened.
•
Wait until pressure is less than 3 psi (20 kPa) gauge or 16 psi (110 kPa) absolute.
•
Vent valve is opened with SPLT exhaust valve left open.
When the PURGE function is initiated, if the current pressure is over 100 psi
(700 kPa) gauge, the display is:
1.
Current measured pressure and pressure units.
2.
Current reference pressure transducer and range.
3.
Indication that PPC2+ is reducing pressure to the
purge pressure of less than 100 psi (700 kPa)
gauge.
:\O]]SXQ E/=-+:/G K^ KXc ^SWO N_\SXQ Z_\QO \Y_^SXO ObOM_^SYX MK_]O] ^RO Z_\QO
P_XM^SYX^YKLY\^KXN\O^_\X]^Y^ROVOKUMROMU]M\OOX]OO=OM^SYX "
Once the current pressure is, or if the purge function was initiated, under 100 psi
(700 kPa) gauge the display is:
1.
Current measured pressure and pressure units.
2.
Current reference pressure transducer and
range.
3.
Indication that PPC2+ is waiting 5 seconds and
preparing to open the SPLT exhaust valve.
Indication flashes.
After a five (5) second wait the display is:
1.
Current measured pressure and pressure units.
2.
Current reference pressure transducer and
range.
3.
Indication that PPC2+ has opened the SPLT
exhaust valve and is waiting for pressure to go to
zero gauge. This indication flashes.
2
3
Descending to purge
2
3
PREPARING TO PURGE
2
3
PURGING
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 46
Once the pressure reaches less than 3 psi (20 kPa) gauge or 16 psi (110 kPa)
absolute, PPC2+ opens its internal vent valve and returns to the main run screen in its
normal vented condition.
AROX^RO=:6>ObRK_]^`KV`OYZOX]K^Z\O]]_\ON_\SXQ^ROZ_\QO\Y_^SXOKXcVS[_SN
MYX^KWSXKX^MYVVOM^ONaSVVLO\OVOK]ON^R\Y_QR^RO=:6>ObRK_]^^_LO3PWOK]_\KLVO
KWY_X^] YP VS[_SN MYX^KWSXK^SYX K\O ObRK_]^ON P\YW ^RO =:6> ObRK_]^ `KV`O S^ S]
\OMYWWOXNON ^RK^ ^RO Z_\QO P_XM^SYX LO \OZOK^ON _X^SV XY XY^SMOKLVO KWY_X^ YP
VS[_SNMYX^KWSXK^SYXS]YL]O\`ONObRK_]^SXQP\YW^RO=:6>ObRK_]^`KV`O
>ROSX^O\XKV`YV_WOYP^RO=:6>S]KLY_^ MM>RO=:6>aSVVXY^YZO\K^OOPPOM^S`OVcSP
^RO`YV_WOYPVS[_SNMYX^KWSXKX^]MYVVOM^ONS]Q\OK^O\^RKXKLY_^MM>RO=:6>S]
NO]SQXON^YZ\Y^OM^^RO::- KQKSX]^YXVc\O]SN_KVVS[_SNMYX^KWSXK^SYX/`OXSPKX
=:6> S] LOSXQ _]ON Z\OMK_^SYX] ]RY_VN LO ^KUOX ^Y \ON_MO ZY^OX^SKV VS[_SN
MYX^KWSXK^SYX P\YW ^RO NO`SMO Y\ ]c]^OW _XNO\ ^O]^ K] W_MR K] ZY]]SLVO LOPY\O
WKUSXQ^ROMYXXOM^SYX^Y^RO::- >/=>ZY\^
.YXY^ZV_Q^RO=:6>ObRK_]^`KV`O>ROZ_\QO\Y_^SXOMKXXY^LOMYWZVO^ONaS^R^RO
=:6>ObRK_]^`KV`OZV_QQONKXN^RO=:6>]Z\Y^OM^S`OP_XM^SYXaSVVXY^LOOPPOM^S`O
3P ^RO =:6> S] OVOM^\SMKVVc MYXXOM^ON ^Y ^RO ::- S^] ObRK_]^ `KV`O aSVV KVaKc] LO
YZOXaROX^RO::- `OX^`KV`OS]YZOX3^WKcLOMVY]ONWKX_KVVc_]SXQ^RO.<3@/<
P_XM^SYX]OO=OM^SYX
3.2.8.4
SETTING PRESSURES FOR LEAK CHECK/PURGE FUNCTION
The direct pressure control keys are active when in the LEAK CHECK screen and can
be used to adjust pressure as desired (see Section 3.1.2.2) keeping in mind that the
[VENT] key will cause the PURGE function to execute if PURGE is enabled (see
Section 3.4.4.8).
Pressing the [ENTER] key from the leak check screen will cause the regular set
pressure screen for automated pressure control to appear (see Section 3.2.3.2).
An automated pressure control command can then be executed.
PPC2+™ Operation and Maintenance Manual
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©2001 DH Instruments, Inc.
3.2.8.5
TYPICAL USE OF THE LEAK CHECK/PURGE FUNCTION
The most common use of the LEAK CHECK/PURGE function is at the beginning of a
test just after the device or system under test has been connected to the PPC2+
TEST port. Generally, the purge process should be completed before leak checking
is performed. This may not be the case when the PPC2+ will be used to apply only
ascending pressures.
To purge:
•
Press the [LEAK CHECK] function key.
•
Use the direct manual pressure control keys to set the desired purge pressure
(generally full scale of the device or system under test or 150 psi (1 MPa),
whichever is lower).
•
Wait for pressure to stabilize.
•
Press the [VENT] key to cause the purge function to execute. Wait for purge
function to execute completely. Observe whether any liquid contaminants
exhaust from the SPLT exhaust valve.
•
Repeat from all steps until no noticeable amount of liquid contamination is
observed exhausting from the SPLT exhaust valve.
To leak check:
•
Press the [LEAK CHECK] function key.
•
Use the direct manual pressure control keys to set the desired leak check
pressure (generally full scale of the device or system under test).
•
Wait for pressure to stabilize.
•
Observe the leak rates displayed in the leak check screen to determine if the leak
rate is within acceptable limits. If leak rate is not acceptable, identify the source of
the leak, vent system and eliminate the leak if possible.
•
Repeat from all steps until leak rate observed in is acceptable.
>RO VOKU MROMU P_XM^SYX MKX KV]Y LO _]ON K^ KXc ^SWO N_\SXQ YZO\K^SYX ^Y MROMU
M_\\OX^VOKU\K^OKXNY\MK_]O^ROZ_\QO\Y_^SXO^YObOM_^O
>RO\OS]`O\cVS^^VO\S]UYPMYX^KWSXK^SYX^Y::- SPS^aSVVLO_]ON^YKZZVcK]MOXNSXQ
Z\O]]_\O] YXVc ^Y ^RO NO`SMO Y\ ]c]^OW _XNO\ ^O]^ ]SXMO PVYaSXQ QK] LKMU ^Y ^RO
::- MKX LO K`YSNON 3X^RS] MK]O ZK\^SM_VK\Vc SP aY\USXQ aS^R K ]SQXSPSMKX^Vc
MYX^KWSXK^ON NO`SMO Y\ ]c]^OW _XNO\ ^O]^ S^ WKc LO Z\OPO\KLVO ^Y XY^ _]O ^RO
:?<1/P_XM^SYX_X^SV^ROOXNYP^RO^O]^KP^O\^ROVK]^K]MOXNSXQZ\O]]_\OSXM\OWOX^
RK]LOOX]O^+V]YLO]_\OXY^^YObOM_^O^RO:?<1/P_XM^SYXK^Z\O]]_\OKLY`O
Z]S7:K
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 48
3.2.9
ANALOG
m PURPOSE
To select the current measurement range of the optional analog input function. This key
has no function if the analog input function is not present in the PPC2+.
m PRINCIPLE
The PPC2+ is available with an analog input option that allows the user to measure up to
four external voltage or current sources. Four ranges of measurement are provided:
•
0 to 100 mV.
•
0 to 5 V.
•
0 to 10 V.
•
4 - 20 mA.
The selected range is effective on all of the inputs together. The measurement is
available on the PPC2+ front panel or remotely.
m OPERATION
To access the ANALOG function, press the [ANALOG] function key from the main
run screen. If the PPC2+ is equipped with the analog input option, the display is:
Input range: 1:100 mV
2:5V 3:10V 4:4-20 mA
The cursor is on the number of the currently active measurement range. Make the
desired selection. The display returns to previous screen with the new analog
measurement range active.
>RO OVOM^\SMKV MYXXOM^SYX] ^Y ^RO KXKVYQ SXZ_^ YZ^SYX K\O WKNO K^ K MYXXOM^Y\ YX ^RO
::- \OK\ZKXOV]OO=OM^SYX!
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©2001 DH Instruments, Inc.
3.2.9.1
VIEWING ANALOG MEASUREMENTS
To view the current reading of the four channels of the optional analog input press the
[+/-] key from the main run screen.
The display is:
The displayed values update about every 0.75 seconds. To return to the main run
screen from the analog input display screen press [+/-] or [ESCAPE].
>RO_XS^SXNSMK^SYXS]@PY\^RO^Y KXN^Y@\KXQO]%W@PY\^RO^YW@
\KXQOKXNW+PY\^RO ^Y W+\KXQO
AROXO`O\^RO::- S]PS\]^^_\XON98Y\^ROKXKVYQSXZ_^YZ^SYX\KXQOS]MRKXQON
KXNY\O`O\c WSX_^O]YPYZO\K^SYX]OO=OM^SYX ^ROKXKVYQP_XM^SYXZO\PY\W]
KX K_^YMKVSL\K^SYX McMVO >RS] McMVO MYWZVO^O] SX KLY_^ ]OMYXN] N_\SXQ aRSMR
KXKVYQWOK]_\OWOX^]K\OSX^O\\_Z^ONKXN^ROKXKVYQ`KV_OPSOVN]NS]ZVKcNK]RO]
3.3 SETUP MENU KEY
m PURPOSE
The [SETUP] menu key accesses a menu of functions and features commonly used in setting up
PPC2+ for use.
m OPERATION
Press the [SETUP] key from the main run screen to access
the SETUP menu. The display is:
3.3.1
CONTROLREF
m PURPOSE
To specify whether PPC2+ should automatically determine whether a vacuum source or
atmospheric pressure is connected to its EXHAUST port or to manually set the EXHAUST
port condition.
-0.001 V 0.001 V
Channel 2
Channel 3
-
Channel 4
3Sequence 4Drivers
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 50
m PRINCIPLE
The PPC2+ exhaust (down) control valves and the output of the exhaust pressure
regulator are connected to the PPC2+ EXHAUST port (see Section 5.8.1.7).
The response of the pneumatic module used to control pressure, particularly when
controlling pressure near and under atmospheric pressure, changes depending on
whether the EXHAUST port is connected to a vacuum source or left open to atmosphere.
To use the proper pressure control algorithms, PPC2+ must know the condition of the
exhaust port.
The ControlRef function allows the PPC2+ to know whether its exhaust port is at vacuum
or atmospheric pressure. An independent exhaust pressure sensor measures the
pressure present at the EXHAUST port. Normally, the exhaust sensor output is used
automatically by PPC2+ to determine the exhaust port condition. If desired, this automatic
determination can be overridden and the exhaust port condition set manually.
The ControlRef function allows setting of whether the EXHAUST port condition will be
determined automatically using the exhaust sensor or set manually. It also allows viewing
of the current status of the EXHAUST port.
>RO XY\WKV MYXNS^SYX YP ^RO -YX^\YV ZY\^ Z\O]]_\O
MYXNS^SYX] K] ::- aSVV NO^O\WSXO ^RO ObS]^SXQ MYXNS^SYX K_^YWK^SMKVVc >RO Y^RO\
]O^^SXQ] K\O XY\WKVVc _]ON YXVc PY\ ]ZOMSKV KZZVSMK^SYX] Y\ ^\Y_LVO ]RYY^SXQ
:\O]]_\OMYX^\YV XOK\ KXN _XNO\ K^WY]ZRO\SM Z\O]]_\O aSVV XY^ YZO\K^O Z\YZO\Vc SP
-YX^\YV. The display is:
Make the appropriate selection.
Selecting <1auto> sets the PPC2+ to determine the EXHAUST port condition
automatically using its internal exhaust sensor. This is the normal control ref setting.
Selecting <2vac> sets the PPC2+ to assume that a vacuum supply is connected to the
EXHAUST port.
Selecting <3atm> sets the PPC2+ to assume that the EXHAUST port is open to
atmospheric pressure.
2vac 3atm 4view
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©2001 DH Instruments, Inc.
Selecting <4view> allows viewing of the current EXHAUST port condition assumed by
PPC2+ and how it was determined.
,OPY\O MYXXOM^SXQ K `KM__W Z_WZ Y\ `KM__W ]Y_\MO ^Y ^RO ::- /B2+?=> ZY\^
=OO=OM^SYX PY\SXPY\WK^SYXYX`KM__WMYXXOM^SYX\O[_S\OWOX^]KXNZ\OMK_^SYX]
>RO-YX^\YVRO]O^^SXQWKNO
SX -YX^\YV. The display is:
Enter the desired pressure display resolution in % FS of the currently active range.
The display returns to the main run screen with the entered resolution setting active.
>RO]c]^OWNOPK_V^Z\O]]_\ONS]ZVKc\O]YV_^SYXS]0=
>RO\O]YV_^SYX]O^^SXQS]\KXQO]ZOMSPSM+\O]YV_^SYX]O^^SXQWKNOSXYXO\KXQONYO]XY^
KPPOM^Y^RO\\KXQO]
3.3.3
Sequence
m PURPOSE
To create, store and edit the sequence files used by the SEQ function (see Section 3.2.5).
m PRINCIPLE
The PPC2+ FILE SEQUENCE function allows a sequence of automated pressure control
targets in a specific range with predetermined control and operating parameters to be
executed by recalling and running a sequence file. The files containing the information
necessary to run a file sequence are created, stored and edited by pressing [SETUP] and
selecting <3Sequence>.
0.0010% FS
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 52
Setting up a sequence file requires specifying:
•
The sequence file number to be created or edited.
•
The RPT to be used (Hi, Lo).
•
The range on the RPT (1, 2 or 3).
•
The pressure units of measure and measurement mode (gauge or absolute).
•
The number of pressure targets in the sequence.
•
The numerical value of each target pressure.
•
Whether a VENT function should be included at the end of the sequence.
•
Whether sequence execution should continue from one pressure target to the next on
operator pressing [ENTER] or automatically on a timer and, if on a timer, the
timer duration.
•
Pressure control mode to be used (static or dynamic).
•
Whether to use custom control parameter settings and the value of those settings if
custom control is selected.
•
The file number under which the sequence definition should be stored.
m OPERATION
=O[_OXMOPSVO]O^_Z\O[_S\O]^RO_]O\^Y]ZOMSPcKVK\QOX_WLO\YPZK\KWO^O\]SXK]O\SO]
YP NK^K OX^\c ]M\OOX] NO]M\SLON LOVYa 0Y\ K ]_WWK\c YP ^RO ]O[_OXMO NOPSXS^SYX
\O[_S\OWOX^]SX^ROY\NO\^ROcK\OONS^ON=OO:<38-3:6/YP^RS]]OM^SYX
To access the Sequence file building function, press
[SETUP] and select <3Sequence>. The display is:
Selecting <1view> allows sequence file characteristics to be viewed only.
Selecting <2edit> allows a sequence file to be edited or created. The instructions below
assume that <2edit> has been selected.
AROXNOPSXSXQK]O[_OXMO^ROE/=-+:/GUOcMKXLO_]ON^YLKMU^R\Y_QR^RONOPSXS^SYX
KXN \OOX^O\ SXPY\WK^SYX _X^SV ^RO X_WO\SMKV `KV_O YP ^RO Z\O]]_\O ^K\QO^] RK]
LOOXNOPSXON>ROX/=-+:/aSVVQY^YK=K`O+]]M\OOXSXaRSMR^RO]O[_OXMOK]ONS^ON
]YPK\MKXLO]K`ON^YK]O[_OXMOPSVOX_WLO\>RS]KVVYa]SXPY\WK^SYXSX^ROLOQSXXSXQYP
K]O[_OXMOPSVO^YLOONS^ONaS^RY_^RK`SXQ^YQY^R\Y_QR^ROOX^S\O]O[_OXMONOPSXS^SYX
1Edit 2View
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©2001 DH Instruments, Inc.
The next display is:
1.
Entry field for the file number of the sequence to
be edited.
Enter the desired sequence file number.
?Z^Y ]O[_OXMOPSVO]MKXLO]O^_ZKNN\O]]X_WLO\]^R\Y_QR
The next selection determines the RPT that will be used:
1.
Indication of the sequence file number that is currently
being edited.
Select the RPT that is to be used by this sequence.
The next selection specifies the range of the
selected RPT that is to be used for this sequence:
Select the range (see Section 3.1.2.5) that is to be used when running this sequence.
The next selections specify the pressure unit and
measurement mode in which the sequence
pressure target pressures will be defined:
3P ^RO <:> ]OVOM^ON PY\ ^RO ]O[_OXMO S] K QK_QO <:> 1BBBB ^RO WOK]_\OWOX^ WYNO
]OVOM^SYXaSVVXY^LOYPPO\ONK]QK_QO<:>]MKXYXVcWOK]_\OSXQK_QOWYNO
Press [ENTER] to proceed to the pressure unit and measurement mode selection.
These will operate in the same manner as when the UNIT function is used (see
Section 3.2.2). To change the pressure units available, press [SPECIAL] and select
<3PresU> (see Section 3.4.3).
The next selection specifies the number of pressure targets in the sequence, including
zeros and vents:
1.
Entry field to edit the total number of targets in the
sequence including zeros and vents.
Enter the total number of targets in the sequence.
nn
1Hi 2Lo Seq01
3Rng3 Seq01
Seq01
11 Seq01
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©2001 DH Instruments, Inc.
Page 54
Next, the numerical values of the pressure targets in the sequence are specified:
1.
Number of the target in the sequence whose value is
currently being edited.
2.
Entry field for the numerical value of the target
pressure.
Enter the numerical value of the target pressure or press the [VENT] direct pressure
control key to cause a VENT command to execute. The display repeats, incrementing
through the target numbers until the total number of targets specified has been defined.
The next selection defines how the sequence will
end, by venting after the last target <1yes> or at the
last target <2no>:
Selecting <1Yes> will cause a VENT command to execute after the last target of the
sequence has been completed. Selecting <2No> will cause the sequence to end at the
last target.
The next selection defines how the sequence will
proceed from one pressure target to the next:
If <1ENTER> is selected, when the sequence is executed, PPC2+ will wait at each
pressure target until [ENTER] is pressed before proceeding to the next target.
If <2Timer> is selected, when the sequence is executed, PPC2+ will start a timer when a
Ready (<*>) condition is reached at a pressure target. Each time the timer expires, the
sequence will proceed automatically to the next pressure target. If is selected,
the dwell time in seconds (minimum 1 and maximum 99) is entered in the next screen.
After defining how the sequence will proceed from
one pressure target to the next, the control mode
is specified:
Enter the desired pressure control mode for the sequence (see Section 3.1.2.3 for a
description of the control modes).
The option of customizing the control mode
parameters for the control mode selected is
then offered:
If <1Yes> is selected, screens will be presented allowing the control hold limit and stability
limit to be adjusted (see Sections 3.2.3 and 3.2.6).
If <2No> is selected, the control parameters will be the default control parameters for the
range and control mode specified for this sequence (see Sections 3.2.3 and 3.2.6).
2
0 psi Seq01
Seq01
1yes 2no
1ENTER 2timer Seq01
1dynamic2static Seq01
1Yes 2No Seq01
PPC2+™ Operation and Maintenance Manual
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©2001 DH Instruments, Inc.
Definition of the file sequence is now complete and the save as choice is offered:
1.
Entry field for sequence file address number under
which to save this sequence.
Enter the desired sequence file number or press [ENTER] if the desired file number is
already displayed.
Pressing [ESCAPE], at , allows all changes to be abandoned.
3.3.4
DRIVERS
m PURPOSE
To control the output signals of PPC2+’s 8 channel, 12 V external drivers.
m PRINCIPLE
PPC2+ external drivers are available to drive peripheral equipment in a PPC2+ system,
for example, solenoid valves or the optional Self Purging Liquid Trap (SPLT). The driver
electrical connections are available from a rear panel connector
=OO=OM^SYX#PY\N\S`O\]ZOMSPSMK^SYX]KXNZSXY_^]
m OPERATION
To access the driver control function press [SETUP] and select <4drivers>.
The display is:
Pressing the keypad numerical key driver number turns that driver ON and OFF with
either a momentary or a toggled response (see next paragraph). An active driver is
indicated by <*> immediately following the driver number.
Pressing [ENTER] while in the External drivers menu causes a menu to appear that
allows selection of whether the driver actuation by selecting the driver number will be
<1momentary> or <2toggle>.
>RO::- :?<1/P_XM^SYXWKUO]_]OYP^RO`KV`ON\S`O\YZ^SYX@KV`ON\S`O\X_WLO\"S]
_]ON ^Y KM^_K^O ^RO =:6> ObRK_]^ `KV`O >RO =:6> ObRK_]^ `KV`O 3] KM^_K^ON aROX
ZO\PY\WSXQ^RO:?<1/P_XM^SYXKXNSX^ROLKMUQ\Y_XNO`O\c^SWO^RO::- `OX^`KV`O
S]YZOXON AROX WKUSXQ _]O YP `KV`O N\S`O\] XY^O ^RK^ aROX ^RO :?<1/ P_XM^SYX S]
OXKLVON`KV`ON\S`O\X_WLO\"aSVVLOKM^_K^ONSXNOZOXNOX^VcYP_]O\SXS^SK^ON`KV`ON\S`O\
MYWWKXN]]OO=OM^SYX "
01
2 3 4 5 6 7 8
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 56
3.4 SPECIAL MENU KEY
The [SPECIAL] menu key accesses a menu of functions that are less commonly used or not normally
used in regular operation.
Press the [SPECIAL] menu key to access the SPECIAL menu.
The display is:
3X::- ,1 ^ROE=:/-3+6GWOX_UOcSXMV_NO]K]OVOM^SYX& @KV`O](=OO^RO::- ,1
9ZO\K^SYXKXN7KSX^OXKXMO7KX_KV
3.4.1
AUTOZ
m PURPOSE
To change the offset (zero) of the Lo and Hi reference pressure transducers relative to a
reference value in order to compensate for RPT zero drift between full recalibrations.
>Y K]]_\O YZO\K^SYX aS^RSX aS^R K_^YdO\Y WOK]_\OWOX^ KMM_\KMc ]ZOMSPSMK^SYX] ]OO
=OM^SYX S^S]\OMYWWOXNON^RK^+_^YDLO\_X^RO`KV_OYPD900=/>_ZNK^ONK^
VOK]^O`O\c NKc]Y\aROX::- RK]LOOXObZY]ON^Y^OWZO\K^_\OMRKXQO]ObMOONSXQ
Ý Ù- Ù0
m PRINCIPLE
How AutoZ Works
The main component of the change over time of the PPC2+ RPTs is zero drift or offset,
independent of span. Rezeroing PPC2+ RPTs relative to a more stable reference
between recalibrations allows higher measurement accuracy specifications to be
maintained with less frequent full calibrations. The PPC2+ autozero function (AutoZ)
provides full on-board support for the rezeroing process to simplify its application by
the user.
The autozeroing function uses four parameters:
1. ZSTD: The value of the autozero pressure as indicated by the reference
autozero device.
For absolute RPTs in absolute measurement mode, the autozero pressure is always
atmospheric pressure and the ZSTD value can be supplied either a) by manual entry;
b) automatically from a DHI RPM connected to the PPC2+ COM2 port or;
c) automatically from a Lo absolute RPT if one is available.
For gauge RPTs or absolute RPTs in gauge measurement mode, the autozero
pressure is always zero (atmospheric pressure) which is supplied by definition when
the RPT is vented to atmosphere.
4Internal
PPC2+™ Operation and Maintenance Manual
Page 57
©2001 DH Instruments, Inc.
2. ZCURERR: The difference between ZSTD and the RPT indication at the autozero
pressure at some time after the calibration of the RPT (ZCURERR = RPT w/out
AutoZ - ZSTD).
3. ZNATERR: The difference between ZSTD and the RPT indication at the autozero
pressure just after the RPT has been calibrated. This is referred to as the natural
error at the autozero pressure. Because no RPT is perfectly linear and ZSTD is not
perfectly accurate, the disagreement between the RPT reading and ZSTD at the
autozero pressure is unlikely to ever be zero (except for gauge RPTs for which the
zero point is forced at calibration).
4. ZOFFSET: ZCURERR corrected for ZNATERR, represents the drift of the RPT
relative to the reference (ZOFFSET = ZCURERR - ZNATERR). The current RPT
reading, adjusted by ZOFFSET, is the autozeroed RPT reading (e.g., the RPT
reading corrected for zero drift since it was calibrated). For an absolute RPT used in
gauge mode, ZOFFSET also includes the value of atmospheric pressure that is being
subtracted to arrive at gauge pressure.
The AutoZ function manages the determination, storage and application of ZNATERR and
ZOFFSET individually for each PPC2+ range and measurement mode.
AutoZ ON/OFF
The AutoZ function can be turned ON and OFF. When AutoZ is ON, the ZOFFSET is
always applied to the pressure measured by PPC2+. When AutoZ is OFF, ZOFFSET is
not applied (except for an absolute RPT in gauge mode for which ZOFFSET is the current
value of atmospheric pressure which is always subtracted to achieve gauge pressure).
Gauge
Mode
with
an
Absolute
RPT,
Dynamic
Compensation
for
Atmospheric Pressure
PPC2+ allows gauge pressure measurements with an absolute RPT by calculation,
subtracting the value of atmosphere (tare) from the RPT’s absolute measurement to arrive
at a gauge value. The appropriate tare value changes with the natural evolution of
atmospheric pressure at a given location. For this reason, the value of the tare is
redetermined each time the RPT is known to be exposed to atmospheric pressure (e.g.,
the PPC2+ is vented and the pressure is stable). However, if atmospheric pressure
changes significantly between opportunities to redetermine the tare, for example if running
an extensive test that does not include returns to a vented condition, the changes in
atmospheric pressure during that time will not be taken into account and a significant zero
offset in the gauge pressure indications could result.
To minimize zero errors due to the evolution of atmospheric pressure between taring
opportunities when using an absolute RPT in gauge measurement mode, PPC2+
dynamically compensates the atmospheric tare value. PPC2+’s on-board barometer
measures atmospheric pressure independently from the RPT. Between opportunities to
update the tare value (vented conditions), the difference between the on-board barometer
reading at the time of the last tare value and the current on-board barometer reading is
used to compensate the tare value. This value is called ATMOFFSET. This technique,
which relies only on the resolution and short term stability of the on-board barometer,
rather than its absolute accuracy, allows gauge measurements with an absolute RPT with
an additional uncertainty due to possible changes in atmospheric pressure limited to
± 0.001 psi (8 Pa).
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 58
AROX _]SXQ KX KL]YV_^O <:> ^Y WKUO VYa QK_QO WYNO WOK]_\OWOX^] ^RO VSWS^ SX
\O]YV_^SYX YP ^RO YXLYK\N LK\YWO^O\ _]ON PY\ NcXKWSMMYWZOX]K^SYXPY\K^WY]ZRO\SM
Z\O]]_\OWKcMK_]O]SQXSPSMKX^NS]^Y\^SYXYP^RO\O]_V^]0Y\LO]^\O]_V^]aROX_]SXQKX
KL]YV_^O<:>SXQK_QOWYNO_XNO\ Z]S U:K^_\X^RO+_^YDP_XM^SYX900]OO
=OM^SYX ^Y OVSWSXK^O ^RO OPPOM^ YP ^RO NcXKWSM MYWZOX]K^SYX ]c]^OW KXN `OX^
::- YP^OX^YUOOZ^ROK^WY]ZRO\SM^K\O`KV_OM_\\OX^
Recommendations for the Use of the AutoZ Function
The AutoZ function provides a powerful and easy to use tool for improving the
measurement accuracy specifications of a PPC2+ and reducing the calibration recall
interval by compensating for zero drift between full recalibrations. The following simple
recommendations will help assure that you use this feature to best advantage.
•
Always leave AutoZ ON when operating in the gauge measurement mode. The only
exception is when using an absolute RPT in gauge mode at pressures under 20 psi
(150 kPa) (see note above).
•
Always leave AutoZ ON when operating in the absolute measurement mode if
ZNATERR was set properly at calibration and the AutoZ routine using a valid
atmospheric reference has been run regularly.
•
Execute the run AutoZ routine only when a reference whose accuracy is known to be
significantly better than that of the PPC2+ RPT is available. Keep range ratios in
mind when comparing accuracy. A ± 0.01 % FS barometer is roughly 10 times more
accurate than an ± 0.01 % FS 150 psi (1 MPa) RPT range because the
RPT/barometer range ratio is 10:1.
•
Though this may not be practical and generally is not necessary, the best reference
with which to run AutoZ is a gas operated piston gauge applying atmospheric
pressure to the PPC2+ test port. The best day to day reference is a properly
calibrated, barometric range, DHI RPM1, RPM2 or RPM3 interfaced directly to the
PPC2+ COM2 port.
•
Allow the PPC2+ to stabilize at atmospheric pressure and ambient temperature for
5 to 10 minutes before running AutoZ.
m OPERATION
>RO +_^YD P_XM^SYX KXN `KV_O] K\O \KXQO +8. WYNO QK_QO Y\ KL]YV_^O ]ZOMSPSM
1K_QO<:>] 1BBBB RK`O XY D8+>/<< KXN XY SXNOZOXNOX^ +_^YD \Y_^SXO K] ^ROc
K_^YdO\Y^\KX]ZK\OX^Vc^Y^RO_]O\aROXO`O\^RO::- S]`OX^ON
To access the PPC2+ AutoZ function press
[SPECIAL] and select <1AutoZ>. The display is:
3edit 4run
PPC2+™ Operation and Maintenance Manual
Page 59
©2001 DH Instruments, Inc.
Selecting <1off> (or <1on>) is for changing the AutoZ status for the current range and
measurement mode from ON to OFF or vice versa. Selecting <1off> turns OFF the
AutoZ function for the current range and mode (see AutoZ ON/OFF of this section).
+_^YD 98 S] SXNSMK^ON Lc K &d( SX ^RO WKSX \_X ]M\OOX ^YZ VSXO ^RS\N MRK\KM^O\ P\YW
^RO\SQR^AROX+_^YDS]900^ROMRK\KM^O\S]LVKXU
Selecting <2view> allows the current value of ZOFFSET for the current range and mode
to be viewed.
Selecting <3edit> allows the value of ZOFFSET for the current range and measurement
mode to be edited.
Selecting <4run> allows the routine for determination and activation of ZOFFSET by
measurement of ZSTD to be executed.
3.4.1.1
VIEW AUTOZ
To view the current ZOFFSET for the current range and measurement mode press
[SPECIAL] and select <1AutoZ>, <2view>. The display is:
1.
Current measurement mode.
2.
Current range.
3.
Display field of current value of ZOFFSET
D900=/> ]RY_VN LO dO\Y aROX ^RO ::- S] XOa Y\ RK] T_]^ LOOX MKVSL\K^ON
D900=/>]RY_VN LO \Y_QRVc O[_KV ^Y K^WY]ZRO\SM Z\O]]_\O PY\ KX KL]YV_^O <:>
YZO\K^SXQSXQK_QOWYNO
>RO `KV_O YP D900=/> S] KVaKc] NS]ZVKcON KXN OX^O\ON SX :K]MKV :K K] ::- ]
SX^O\XKVYZO\K^SYX]K\OSX:K
2
3
0.0 Pa
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 60
3.4.1.2
EDIT AUTOZ
>ROONS^+_^YDP_XM^SYX]RY_VNLO_]ONaS^RQ\OK^MK_^SYXK]OX^O\SXQSXKZZ\YZ\SK^O
`KV_O] KXN ^_\XSXQ 98 +_^YD WKc \O]_V^ SX SXMY\\OM^ K_^YdO\YSXQ KXN Y_^ YP
^YVO\KXMOWOK]_\OWOX^] 3X XY\WKV YZO\K^SYX ^RO `KV_O YP D900=/> ]RY_VN LO
MRKXQON_]SXQ^RO\_X+_^YDP_XM^SYX]OOX=OM^SYX >ROYXVcObZOM^ON_]O
YP ONS^ +_^YD S] ^Y ]O^ D900=/> ^Y dO\Y KP^O\ K MKVSL\K^SYX YP ::- <:>]
,OPY\OONS^SXQD900=/>=OO=OM^SYX] :<38-3:6/KXN
To edit the current ZOFFSET for the current range and measurement mode, press
[SPECIAL] and select <1AutoZ>, <3edit>. The display is:
1.
Current measurement mode.
2.
Current range.
3.
Edit field for value of ZOFFSET
>RO`KV_OYPD900=/>S]KVaKc]NS]ZVKcONKXNOX^O\ONSX:K]MKV:K
3.4.1.3
RUN AUTOZ
Run AutoZ is the function by which the current RPT reading is compared to ZSTD and
a new value of ZOFFSET representing RPT zero drift is determined (see
Section 3.4.1, PRINCIPLE, How AutoZ Works).
To access run AutoZ, press [SPECIAL] and select <1AutoZ>, <4run>.
If the measurement mode of the current range is gauge, run AutoZ occurs
transparently to the user whenever AutoZ is ON and the PPC2+ is in the
vented condition. The display is:
1.
Indication of current range.
2
3
0.0 Pa
no manual AutoZ
PPC2+™ Operation and Maintenance Manual
Page 61
©2001 DH Instruments, Inc.
If the measurement mode of the current range is absolute the display is:
1.
Current range.
2.
Current measurement mode.
3.
Selection of source of ZSTD for ZOFFSET
determination.
Selecting <1Entry> allows the value of ZSTD to be entered from the front
panel keypad.
Selecting <2COM2> allows the value of ZSTD to be read automatically from an RPM
interfaced with PPC2+’s COM2 communications port.
Selecting <3RngL3> is available only if the current RPT is a Hi absolute RPT and
there is a Lo absolute RPT. Allows the value of ZSTD to be read automatically from
the Lo RPT.
+VVYa^RO::- ^Y]^KLSVSdOK^K^WY]ZRO\SMZ\O]]_\OKXNKWLSOX^^OWZO\K^_\OPY\
^YWSX_^O]LOPY\O\_XXSXQ+_^YD
3P\_XXSXQ+_^YD\O]_V^]SX`KV_O]YPD900=/>^RK^K\OQ\OK^O\^RKXÝ0=YP
^ROM_\\OX^::- WOK]_\OWOX^\KXQO^RO::- KXNY\^RO]Y_\MOYPD=>.WKcLO
Y_^YP^YVO\KXMOY\^RO+_^YDZ\YMO]]WKcRK`OLOOXPK_V^c,OPY\OKM^S`K^SXQKXOa
D900=/>Q\OK^O\^RKXÝ0=YP^ROM_\\OX^::- \KXQOMROMU^YLO]_\O^RK^
LY^R^RO::- KXN^RO]Y_\MOYPD=>.aO\OSXQYYNaY\USXQY\NO\Z\YZO\Vc`OX^ON^Y
]^KLVOK^WY]ZRO\SMZ\O]]_\OK^^RO]KWOROSQR^KXN\OKNSXQSX^RO]KWOZ\O]]_\O
_XS^]aROX+_^YDaK]\_X
AROX^RO\_X+_^YD]OVOM^SYXS]WKNOSPK2/+.MY\\OM^SYXS]M_\\OX^VcKM^S`O]OO
=OM^SYX ! ^RO ROKN MY\\OM^SYX aSVV LO NS]KLVON ^Y K`YSN K_^YdO\YSXQ ^RO
ROKN`KV_O
>RO`KV_OYPD900=/>aSVVXY^LOObKM^VcO[_KV^Y^RONSPPO\OXMOLO^aOOX^ROM_\\OX^
\OKNSXQ KXN D=>. SP D8+>/<< S] XY^ dO\Y ]OO =OM^SYX :<38-3:6/ 2Ya
+_^YDAY\U]
>RO`KV_OYPD900=/>S]KVaKc]NS]ZVKcONKXNOX^O\ONSX:K]MKV:K
AutoZ H3 abs by:
1Entry 2COM2 3RngL3
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 62
Run AutoZ by Entry
AutoZ by entry allows the value of ZSTD (See Section 3.4.1, PRINCIPLE, How AutoZ
Works) to be entered manually. This provides a simple way of autozeroing relative to
an independent reference device such as a house barometer that does not interface
directly with PPC2+.
To access run AutoZ by entry press [SPECIAL] and select <1AutoZ>,
<4run>, <1Entry>. The display is:
1.
Pressure reading, units and mode of the
active RPT range.
2.
Active range indicator.
3.
Entry field for the value of ZSTD.
Enter the value of ZSTD in the current units.
The next display is:
The new ZOFFSET is the ZOFFSET calculated from this execution of run AutoZ.
Press [ENTER] to activate the new ZOFFSET and return to the main run screen.
Press [ESCAPE] to maintain the old ZOFFSET and return to the main run screen.
>RO`KV_OYPD900=/>S]KVaKc]NS]ZVKcONKXNOX^O\ONSX:K]MKV:K
>RO`KV_OYPD=>.S]OX^O\ONSX^ROM_\\OX^Z\O]]_\O_XS^]
2
3
ZSTD: 0.0000
New ZOFFSET: 6.5 Pa
PPC2+™ Operation and Maintenance Manual
Page 63
©2001 DH Instruments, Inc.
Run AutoZ by COM2
AutoZ by COM2 allows the value of ZSTD (see Section 3.4.1, PRINCIPLE, How
AutoZ Works) to be read automatically from a DHI RPM1, RPM2 or RPM3 connected
by RS-232 interface to the PPC2+ COM2 port.
To access run AutoZ by COM2 press [SPECIAL] and select <1AutoZ>,
<4run>, <2COM2>. The display is:
1.
Pressure reading, units and mode of the
active RPT range.
2.
Active range indicator.
3.
Pressure reading of the RPM connected to
PPC2+’s COM2 port.
When Ready (<*>), press [ENTER]. The next
display is:
The new ZOFFSET is the ZOFFSET calculated from this execution of run AutoZ.
Press [ENTER] to activate the new ZOFFSET and return to the main run screen.
Press [ESCAPE] to maintain the old ZOFFSET and return to the main run screen.
0Y\::- ^YMYWW_XSMK^OaS^RKX<:7MYXXOM^ON^YS^]-97 ZY\^^RO::- KXN
^RO <:7 <= SX^O\PKMO] W_]^ LO ]O^ _Z Z\YZO\Vc ]OO =OM^SYX 3P^RO
::- S] _XKLVO ^Y VYMK^O KX <:7 YX -97 aROX \_XXSXQ +_^YD Lc -97 KP^O\
]OMYXN]S^aSVV^SWOY_^KXNNS]ZVKc&<:7XY^NO^OM^ON(
>RO`KV_OYPD900=/>S]KVaKc]NS]ZVKcONKXNOX^O\ONSX:K]MKV:K
Run AutoZ by RngL3
The AutoZ by RngL3 choice is only available if the current RPT is an absolute, Hi RPT
and there is an absolute Lo RPT in the PPC2+. Run AutoZ by RngL3 allows AutoZ to
be run on a Hi RPT range using Lo RPT range 3 (L3) as the source of ZSTD (see
Section 3.4.1, PRINCIPLE, How AutoZ Works).
To access run AutoZ by RngL3 press [SPECIAL] and select <1AutoZ>,
<4run>, <3RngL3>. The display is:
1.
Pressure reading, units and mode of the
active Hi RPT range.
2.
Active range indicator.
3.
Pressure reading of Lo RPT range 3 (L3).
2
3
ZSTD: 14.102
2
3
ZSTD: 14.102
New ZOFFSET: 13.8 Pa
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 64
When, press [ENTER]. The next display is:
The new ZOFFSET is the ZOFFSET calculated from this execution of run AutoZ.
Press [ENTER] to activate the new ZOFFSET and return to the main run screen.
Press [ESCAPE] to maintain the old ZOFFSET and return to the main run screen.
3PcY_K\O\_XXSXQ+_^YDYX^RO2SKXN6Y<:>]YPK::- KXN_]SXQ\_X+_^YDLc
LO]_\O^Y\_X+_^YDYX^RO6Y<:>PS\]^
,OPY\O \_XXSXQ +_^YD Lc 6Y <:> LO ]_\O ^RK^ \KXQO 6 YP ^RO 6Y <:> S] MY\\OM^Vc
MKVSL\K^ONKXNK_^YdO\YON
>RO`KV_OYPD900=/>S]KVaKc]NS]ZVKcONKXNOX^O\ONSX:K
3.4.2
HEAD
m PURPOSE
To specify the configuration of the HEAD function (see Section 3.2.7) including the length
unit of measure for head height entry and the test gas species for head pressure
calculations (see Section 3.2.7).
m OPERATION
From the main run screen, press [SPECIAL] and
select <2Head>. The display is:
Select the desired head height unit. The next display is:
Select the type of gas that is being supplied to PPC2+. The characteristics of the gas
selected will be used by PPC2+ in calculating head pressures.
New ZOFFSET: 13.8 Pa
1in 2cm
1N2 2He 3Air
PPC2+™ Operation and Maintenance Manual
Page 65
©2001 DH Instruments, Inc.
3.4.3
PresU
m PURPOSE
To customize the selection of pressure units that will be available for selection from the
[UNIT] function key.
m PRINCIPLE
The [UNIT] function key makes available a choice of six default pressure units (US or SI
units depending on whether the PPC2+ has been factory set as US or SI) (see
Section 3.2.2). PPC2+ also supports many commonly used units other than those
included in the default set up. These units can be made available for active selection by
customizing the UNIT function using by pressing [SPECIAL] and selecting <3PresU>.
This allows PPC2+ to offer a very wide selection of units while simplifying day to
day operation. The typical user will customize the [UNIT] function key to support his/her
six most commonly used units.
m OPERATION
To customize the [UNIT] function key, from the main run screen press [SPECIAL] and
select <3PresU>. The display is:
1.
Entry field to select which unit position (1 - 6) of the
UNIT function key menu is to be changed.
Enter the number of the unit position that you would
like to change. The display becomes:
Select the desired pressure unit category (SI units include units based on SI such as
mmHg), then select the desired unit from the unit menu.
The units available are listed in Table 8.
Table 8. UNIT Function - Available Units
<1SI>
<2other>
<3altitude>
<4user>
<1Pa>
<2kPa>
<3MPa>
<4mbar>
<5bar>
<6mmHg>
<7mmWa>
<1psi>
<2psf>
<3inHg>
<4inWa>
<5kcm2>
<1feet>
<2meters>
3altitude 4user
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 66
If <4user> was selected, the user unit must be defined. The display is:
1.
Entry field.
Enter the number of user units per Pascal (Pa) in the entry field. Pressing [ENTER]
defines the user unit and returns to the Set up unit # screen.
=OO=OM^SYX! PY\^ROZ\O]]_\O_XS^MYX`O\]SYXPKM^Y\]_]ONLc::-
3.4.4
INTERNAL
m PURPOSE
To view, set, adjust, and maintain various aspects of PPC2+’s internal operation.
m OPERATION
To access the internal selections press [SPECIAL]
and select <4Internal>. The display is:
Select the internal function desired. For a detailed description of each internal function.
See Sections 3.4.4.1 to 3.4.4.9.
=YWO]M\OOX]]_MRK]^RO=:/-3+6 3X^O\XKVWOX_QYLOcYXN^RO^aYVSXO]Z\Y`SNONLc
^RO NS]ZVKc >RS] S] SXNSMK^ON Lc K PVK]RSXQ K\\Ya SX ^RO ]OMYXN VSXO YP ^RO NS]ZVKc
:\O]]^ROE←GKXNE→GK\\YaUOc]^YWY`O^ROM_\]Y\^YKMMO]]^ROVSXO]^RK^K\OXY^
`S]SLVOY\NS\OM^VcOX^O\^ROX_WLO\YP^RORSNNOXWOX_MRYSMOSPcY_UXYaS^
3.4.4.1
CONFIG
m PURPOSE
To
run
an
automated
routine
that
readjusts
internal
pressure
control characteristics. This function is considered part of PPC2+ maintenance
and is therefore covered in the maintenance section of this manual (see
Section 5.5).
m OPERATION
See Section 5.5.
1.0000000 Units/PA
4Time 5Reset 6Level
7Atm 8Purge 9ScrSav
PPC2+™ Operation and Maintenance Manual
Page 67
©2001 DH Instruments, Inc.
3.4.4.2
CAL
m PURPOSE
To calibrate the PPC2+ Hi and Lo reference pressure transducers and adjust the
on-board barometer. This function is considered part of PPC2+ maintenance and
is therefore covered in the maintenance section of this manual (see Section 5.2).
m PRINCIPLE
See Sections 5.2, 5.3, and 5.4.
m OPERATION
See Sections 5.2, 5.3, and 5.4.
3.4.4.3
REMOTE
m PURPOSE
To configure the PPC2+ communication ports including COM1, COM2 and the
IEEE-488 interface.
m PRINCIPLE
The PPC2+ has two RS-232 communications ports referred to as COM1 and
COM2 and an IEEE-488 (GPIB) interface. Communication with a host computer
is accomplished using either COM1 or the IEEE-488 interface. COM2 is reserved
for
connecting
an
external
device
(e.g.,
a
multimeter,
RPM,
etc.).
The configuration of all the communication ports can be set up through the
PPC2+ front panel.
m OPERATION
To access the port configurations and remote program command mode, select
<3Remote> under <4Internal> of the SPECIAL menu. Select ,
or to view and edit that port’s settings. Select to
select the remote programming command format to use (see FORMAT of
this section).
COM1 and COM2
The COMx ports can be set for the specific settings required by the user.
These settings are baud, parity, length and stop bit. The available options are:
•
Baud: 300, 600, 1 200, 2 400, 4 800, 9 600
•
Parity: NONE, ODD or EVEN
•
Length: 7 or 8
•
Stop Bit: 1 or 2
The default is <2400, E, 7,1> for COM1 and COM2.
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 68
The user can also specify one or two termination characters as well as define
these characters. These are referred to as “Term1” and “Term2”. These define
the characters that mark the end of commands that are sent to the PPC2+ as well
as mark the end of replies sent back to the host computer. The PPC2+ typically
will use the character to mark the end, and will ignore the
character. These characters can be any decimal number from 1 to 255.
The default for these are <13> (carriage return) and <10> (line feed) and usually
should not be changed.
IEEE-488
The IEEE-488 port’s primary address can be set from 1 to 31 in this screen.
The factory default value is 10. Secondary addressing is not used or supported.
This address must not conflict with the address of any other devices on the same
IEEE-488 bus.
The receiving terminating character must be a line feed and EOI.
Carriage returns are ignored if received. The PPC2+ sends a line feed and
asserts the EOI line to terminate a reply. These settings are fixed to agree with
IEEE Std. 488. If you change the address, the IEEE interface will reset (PON)
and become idle.
Format
The PPC2+ has two different syntax formats available for the remote
program commands. The classic format is compatible with previous PPC
products and is the default format. The enhanced format follows the syntax,
format, and status reporting features of IEEE Std 488.2. The details of each are
covered in Section 4.3. Selecting a format resets the IEEE interface and puts it
into an idle state.
3.4.4.4
TIME
m PURPOSE
To view and edit the PPC2+ internal time and date settings.
m OPERATION
To
access
the
time
function
press
[SPECIAL]
and
select
<4Internal>,
<4Time>. The display is:
Select <1time> to edit the time. Edit hours, then minutes, then am/pm by
pressing ENTER at each entry. Seconds go to zero when minutes are entered.
Select <2date> to edit the date. The date must be specified in YYMMDD format.
>RO::- NK^OKXN^SWOK\O]O^^Y?XS^ON=^K^O]7Y_X^KSX=^KXNK\N>SWOSX
^RO PSXKV ^O]^ KXN SX]ZOM^SYX Z\YMO]]K^^ROPKM^Y\c3PNO]S\ON_]O^RONK^O
P_XM^SYX^Y]O^cY_\VYMKV^SWOKXNNK^O
08:32:11 am 970724
PPC2+™ Operation and Maintenance Manual
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©2001 DH Instruments, Inc.
3.4.4.5
RESET
m PURPOSE
To reset various PPC2+ settings to default or factory values.
PPC2+ stores its user definable settings in non-volatile memory. The reset menu
allows the user to selectively or completely reset these settings to factory defaults.
This clears out any settings that the user has set up, and should be used only to
restore the PPC2+ to a known state. PPC2+ will go through its reboot sequence
after any type of reset is executed.
::- \O]O^ P_XM^SYX] aSVV MRKXQO M_\\OX^ ]O^^SXQ] ^Y PKM^Y\c NOPK_V^]
>RO]OWKcSXMV_NO]O^^SXQ]`S^KV^Y::- YZO\K^SYXKXNKPPOM^SXQ^ROMKVSL\K^SYX
YP^RO\OPO\OXMOZ\O]]_\O^\KX]N_MO\],
<5Reset>.
The display is:
Reset - Sets
m PURPOSE
Sets most general system operating parameters back to default values. Does not
affect calibration coefficients or remote interfaces.
•
Returns each range unit of measure to the first of six available (see
Section 3.2.2).
•
Returns measurement mode to the RPT mode (A or G) (see Section 3.2.2).
•
Range to H3 (see Section 3.2.1).
•
Head settings to 0 cm and Nitrogen (see Section 3.2.7).
•
Automated pressure control parameters to defaults (see Section 3.1.2.3).
•
All upper limit values to defaults (see Section 3.2.4).
•
Pressure display resolution to 0.001 % FS (see Section 3.3.2).
•
Control mode to dynamic (see Section 3.1.2.3).
•
COM ports and IEEE-488 settings (see Section 3.4.4.3).
•
Purge disabled (see Section 3.4.4.8).
•
Autozero enabled (see Section 3.4.1).
4cal 5all
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 70
•
Control Ref to auto (see Section 3.3.1).
•
Screen saver to 10 minutes (see Section 3.4.4.9).
Reset - Units
m PURPOSE
Sets the six pressure units available under the UNIT function to the SI or US
default selections depending on whether the PPC2+ has been factory set for SI
or US.
See Sections 3.2.2 and 3.4.3.
Reset - Seq
m PURPOSE
•
Clears all of the user defined file and quick sequences. See Sections 3.2.5
and 3.3.3.
•
Sets user level control configuration to factory defaults. See Sections 3.4.4.1
and 5.5.
Reset - Cal
m PURPOSE
>RO \O]O^ MKV P_XM^SYX aSVV NOVO^O <:> MKVSL\K^SYX MYOPPSMSOX^] MRKXQSXQ ^RO
::- MKVSL\K^SYX
Clears all user values affecting the calibration of RPTs and the on-board
barometer including:
•
Sets all user RPT PA/PM values to 0 and 1 (see Section 5.2).
•
Sets user on-board barometer PA/PM to 0 and 1 (see Section 5.3).
•
Sets all ZNATERR values back to zero (see Section 5.2.6).
•
Sets all ZOFFSET values back to zero (see Section 3.4.1).
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©2001 DH Instruments, Inc.
Reset - All
m PURPOSE
>RO \O]O^ KVV P_XM^SYX aSVV MVOK\ KXN NOVO^O VK\QO KWY_X^] YP _]O\ NOPSXON
SXPY\WK^SYXSXMV_NSXQM\S^SMKVMKVSL\K^SYXNK^K
Combines all resets in one global reset command that clears the entire user
section of non-volatile memory. These include:
•
Reset - sets (see Section 3.4.4.5.1).
•
Reset - units (see Section 3.4.4.5.2).
•
Reset - seq (see Section 3.4.4.5.3).
•
Reset - cal (see Section 3.4.4.5.4).
•
Reset - Com1, Com2 and IEEE-488 interface to defaults (see
Section 3.4.4.3).
>RO\O S] XY \O]O^ ^cZO ^RK^ KPPOM^] ^RO _]O\ VO`OV Z\Y^OM^SYX ]O^^SXQ] ]OO
=OM^SYX
3.4.4.6
LEVEL
m PURPOSE
To set user protection levels to restrict access to certain functions and to edit the
password required for changing user levels.
m PRINCIPLE
PPC2+’s front panel user interface provides the means to access all PPC2+ user
defined
data,
settings
and
functions
including
calibration
data.
Inadvertent, uninformed or unauthorized altering or deleting of data, settings and
functions could require extensive reconfiguration by the user and might cause
invalid readings and behavior. For these reasons, depending upon the
application in which PPC2+ is being used, it may be desirable to restrict access to
certain functions for certain users. The user level function provides a means of
restricting access to certain functions. Four different levels of security
are available.
Access to changing security levels can be left open, or be protected by
a password.
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 72
Security Levels
The security levels are structured to support typical operating environments
as follows:
None
This level is intended for use only by the system manager and/or
calibration facility. It allows access and editing in all areas including
critical metrological information.
Low
This level of security is designed to protect the specific metrological
information and system diagnostic and maintenance functions of
the system. It is intended for an advanced operator performing many
different tasks.
Medium
This level of security is designed to protect specific metrological
information in the system and to assure that the PPC2+ is operated using
consistent operational parameters.
High
This level of security is designed to protect all operating parameters. It is
intended to minimize operator choices, for example to perform repeated
identical calibrations under consistent conditions.
::- S]NOVS`O\ONaS^R^RO]OM_\S^cVO`OV]O^K^VYa^YK`YSNSXKN`O\^OX^KV^O\SXQYP
M\S^SMKV SX^O\XKV ]O^^SXQ] L_^ aS^R KMMO]] ^Y MRKXQSXQ ]OM_\S^c VO`OV] _X\O]^\SM^ON
3^S]\OMYWWOXNON^RK^^ROVYa]OM_\S^cVO`OVLOWKSX^KSXONK^KVV^SWO]3P^RO\OS]K
\S]U YP _XK_^RY\SdON MRKXQSXQ YP ^RO ]OM_\S^c VO`OV MRKXQSXQ K_^RY\S^c ]RY_VN LO
ZK]]aY\NZ\Y^OM^ON]OO9:/<+>398YP^RS]]OM^SYX
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©2001 DH Instruments, Inc.
The security levels are structured to support typical levels of operation as shown in
Table 9.
Specifically, the security levels prevent execution of the X’d functions:
Table 9. Security Levels
FUNCTION
LOW
MEDIUM
HIGH
[RANGE] key
X
[UNIT] key
X
[CONTROL] key
X
[UPPER LIMIT] key
X
[SEQ] key, Run current quick sequence, <2No>
X
[CUSTOM CONTROL] key
X
X
[HEAD] key
X
[SETUP] menu, <1ControlRef>
X
[SETUP] menu, <1ControlRef>, change status
X
X
[SETUP] menu, <2Resltn>
X
X
[SETUP] menu, <3Sequence>, <2Edit>
X
[SETUP] menu, <4Drivers>
X
[SPECIAL] menu
X
X
[SPECIAL] menu, <1AutoZ>
X
X
[SPECIAL] menu, <1AutoZ>, edit
X
X
X
[SPECIAL] menu, <2Head>
X
X
[SPECIAL] menu, <3PresU>
X
X
[SPECIAL] menu, <4Internal>
X
X
[SPECIAL] menu, <1Config>
X
X
X
[SPECIAL] menu, <4Internal>, <2Cal>
X
X
X
[SPECIAL] menu, <4Internal>, <4Time>, edit
X
X
X
[SPECIAL] menu, <4 Internal>, <5Reset>, <4cal>
X
X
X
[SPECIAL] menu, <4Internal>, <5Reset>, <5all>
X
X
X
m OPERATION
PPC2+ is delivered with no active password and access to the User Level
menu is open. The user level is set to 1Low. User levels can be changed
freely until a password has been created.
To access the User Level function, press
[SPECIAL] and select <4Internal>,
<6Level>. If no password yet exists or if
the correct password has been entered.
The display is:
Selecting <1change> user level brings
up the restriction menu:
You can then select the current restriction level, or [ESC] back to the
RUN screen.
0 disables password
2low 3medium 4high
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 74
The second selection
displays the user password and allows it
to be edited. Passwords can be up to
six numbers in length and cannot start
with a zero.
9XMOKZK]]aY\NRK]LOOXOX^O\ON^RO_]O\VO`OVMKXXY^LOMRKXQONaS^RY_^
\OOX^O\SXQ^ROZK]]aY\N
If <0> is entered, then the password is made inactive and the user will not be
required to enter a password to access the user level menu. This is the
factory default with a security level of <2low>.
If there is an active password, the
PPC2+ password entry screen will
appear. The user must enter the user
defined
password
or
the
factory
secondary
password
to
proceed
any further:
The first field is the serial number of the PPC2+, followed by a
second field that represents the number of times that a secondary
password has been used. This second field increments each time a
secondary password is used. The third field is where the user enters
the password.
>ROPKM^Y\c]OMYXNK\cZK]]aY\NS]K`KSVKLVOSXMK]O^RO_]O\]ZK]]aY\NRK]
LOOX WS]ZVKMON Y\ PY\QY^^OX 3^ MKX LO YL^KSXON Lc MYX^KM^SXQ .23
-_]^YWO\=O\`SMO >RO PKM^Y\c ]OMYXNK\c ZK]]aY\N S] NSPPO\OX^ PY\ KVV
::- ]KXNMRKXQO]OKMR^SWOS^S]_]ON
3.4.4.7
ATM
m PURPOSE
To view the value of atmospheric pressure as measured by the on-
board barometer.
In the PPC2+ BG0002 model, the on-board barometer measures the pressure on
the TEST(-) port (see the PPC2+ BG0002 Operation and Maintenance Manual).
m PRINCIPLE
PPC2+ has an independent on-board barometer. The atmospheric pressure
measurements made by the on-board barometer are used only for dynamic
compensation of atmospheric pressure when using an absolute reference
pressure transducer to make gauge pressure measurements (see Sections 3.4.1,
PRINCIPLE and 1.2.6).
2edit password
Password: pppppp
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©2001 DH Instruments, Inc.
>RO YXLYK\N LK\YWO^O\ S] K VYa KMM_\KMc ]OX]Y\ _]ON YXVc PY\ WOK]_\SXQ
MRKXQO] SX K^WY]ZRO\SM Z\O]]_\O Y`O\ ]RY\^ ZO\SYN] YP ^SWO ]OO
=OM^SYX :<38-3:6/::- WOK]_\OWOX^KMM_\KMcNYO]XY^NOZOXNYX^RO
KL]YV_^OKMM_\KMcYP^ROYXLYK\NLK\YWO^O\
m OPERATION
To view the current reading of the on-board barometer press [SPECIAL] and
select <4Internal>, <7Atm>. The display is in the pressure units of the current
PPC2+ range.
3.4.4.8
PURGE
m PURPOSE
To enable and disable the purge function which makes automated use of the
optional SPLT (see Section 3.2.8.3).
m OPERATION
To access the purge enable/disable function press [SPECIAL] and select
<4Internal>, <8Purge>. Select <1yes> to enable purge or <2no> to
disable purge.
AROX ^RO Z_\QO P_XM^SYX S] OXKLVON ::- aSVV WKUO LKMUQ\Y_XN _]O YP `KV`O
N\S`O\MRKXXOV
"SXNOZOXNOX^VcYP_]O\KM^SYX]]OO=OM^SYX
3.4.4.9
SCRSAV
m PURPOSE
To adjust the PPC2+ screen saver function.
m PRINCIPLE
PPC2+ has a screen saver function which causes the display to dim after a front
panel key is not pressed for a certain amount of time. This function is factory set
to activate after 10 minutes of inactivity but can be adjusted by the user.
m OPERATION
To
access
the
screen
saver
function
press
[SPECIAL]
and
select
<4Internal>, <9ScrSav>. Edit the screen saver on time in minutes as desired.
=O^^SXQ]M\OOX]K`O\^SWO^YdO\YOVSWSXK^O]^RO]M\OOX]K`O\P_XM^SYX]Y^RK^
^RONS]ZVKcaSVVZO\WKXOX^Vc\OWKSXK^P_VVL\SQR^XO]]
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©2001 DH Instruments, Inc.
/9:/<+>398
4.1 OVERVIEW
Most of the PPC2+ front panel functions can also be executed by commands from a
remote computer. The host computer can communicate to the PPC2+ using the PPC2+ COM1
RS-232 port or the IEEE-488 port.
Before writing test code which makes use of PPC2+ remote commands, familiarize yourself with its
operating principles by reading Section 3 of this manual.
4.2 INTERFACING
Sending a program message to the PPC2+ will place it into remote mode. The remote indicator in
the lower left hand corner of the PPC2+ front panel will light when the PPC2+ is in remote mode.
It will also flicker when a program message is received. The menus usually accessed from the
front panel are locked out while in remote. The [ESCAPE] key returns the PPC2+ to local
operation unless the program message was sent to the unit, which locks out all
keypad operation.
4.2.1
RS-232 INTERFACE
4.2.1.1
COM1
The PPC2+ COM1 RS-232 interface is located on the back of the unit. It is a 9-pin
male DB-9F connector configured as a DCE device. Data is transmitted out of the
unit using pin 2, and is received on pin 3. This allows a normal pin-to-pin DB-9M to
DB-9F RS-232 cable to be used to connect to a DTE host.
Handshaking is not required or supported. The COM1 receive buffer is
80 bytes deep. If you overflow the buffer by sending too much data, the data will
be lost. Because of this, you must send a single program message at a time and you
must wait for the PPC2+ to reply from the previous command before issuing
another command.
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©2001 DH Instruments, Inc.
Page 78
Table 10. Pin Designations and Connections
PPC2+ COM1 DB-9F PIN DESIGNATIONS
PIN #
FUNCTION
DESCRIPTION
2
TxD
This pin transmits serial data from the PPC2+ to the host.
3
RxD
This pin accepts serial data from the host computer.
5
Grn
This pin is the common return for the TxD and RxD signals.
IBM PC/XT DB-9F CONNECTIONS
IBM PC/XT DB-9M TO PPC2+ DB9F
CONNECTION
DB-25M
DB-9F
DB-9M
DB-9F
2
3
3
3
3
2
2
2
7
5
5
5
4.2.1.2
IEEE-488
The PPC2+ IEEE-488 interface is located on the back of the unit. The physical and
electrical interface conforms to IEEE Std 488.1-1987 Subset E2 and IEEE
Std. 488.2-1992. You should not attempt to communicate with the IEEE-488 interface
while using the COM1 interface. The IEEE-488 receive buffer is 250 bytes deep.
If you attempt to overflow the buffer, the PPC2+ will hold off release of the NRFD
handshake line until it can service and empty the receive buffer. This keeps the buffer
from overflowing.
4.2.1.3
COM2
The PPC2+ COM2 RS-232 interface is located on the back of the unit. It can be used
to allow the Host computer to communicate with another device through the PPC2+.
This allows the user to use one Host COM port to communicate with the PPC2+ and
an additional RS-232 device. Refer to the remote program message
for details.
COM2 is a 9-pin female DB-9F connector configured as a DTE device. Data is
transmitted out of the unit using pin 3, and is received on pin 2. This allows a normal
pin-to-pin DB-9M to DB-9F RS-232 cable to be used to connect to a DCE device.
Handshaking is not required or supported.
Table 11. List of PPC2+ COM2 DB-9F Pin Designations
PIN #
FUNCTION
DESCRIPTION
2
TxD
This pin transmits serial data from the PPC2+ to a device.
3
RxD
This pin accepts serial data from the external device.
5
Grn
This pin is the common return for the TxD and RxD signals.
4
DTR
This pin is Data Terminal Ready (DTR) (held at +5 V).
PPC2+™ Operation and Maintenance Manual
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©2001 DH Instruments, Inc.
4.3 PROGRAMMING FORMATS
The PPC2+ program message set is downward compatible with the previous PPC2 program
message set. PPC2+ also introduces a new enhanced program message format to support IEEE Std
488.2 syntax, format, and status reporting. The user must select whether to use either the original
“classic” program message format, or the new “enhanced” program message format. The enhanced
format is recommended when possible, as the classic format is obsolete. Selection can be
accomplished from the front panel (see Section 3.4.4.3) or remotely by using the “MSGFMT”
program message. The default is the classic program message format to allow downward
compatibility with existing host software. The basic commands are similar for both the classic and
enhanced formats, but the usage, syntax, format and status reporting are different.
The PPC2+ enhanced program message format also includes new additional common program
messages that are required in every device that complies with the IEEE Std 488.2. These addition
common program messages are covered separately in Section 4.6.1.
4.3.1
CLASSIC PROGRAM MESSAGE FORMAT
The classic program message format is downward compatible with the previous PPC2
program message set. However, several PPC2 functions are not supported by PPC2 and
neither are their corresponding commands (see DEVICE, DPG, ISO, PPC, HOLD, TOUT,
TS, CONFIG10). This format is recommended only if you need downward compatibility with
older PPC2 controllers. Each program message sent is also a query. You can only send one
program message to the PPC2+ at time. After sending any program message, you must wait
for the PPC2+ to reply before sending another program message. This reply will contain data,
or a numeric error message if the program message was invalid. You must wait for this reply
before issuing another program message to the PPC2+. This insures that the PPC2+ has
completed the program message. Most remote program messages will return a reply within
500 ms except:
PR, PRR, SR, ATM, RATE Up to 2.0 seconds to allow a new measurement.
The syntax and format used for each program message in the classic mode is listed next to
the keyword ‘Classic:’ in each program message summary in Section 4.4.4.
4.3.2
ENHANCED PROGRAM MESSAGE FORMAT
This enhanced program message format uses the IEEE Std. 488.2 format, syntax and status
reporting and is recommended for new applications. Errors are reported using the IEEE Std.
488.2 status reporting model. If an error is reported, the error is put into an Error Queue and
the “ERR?” query program message can be used to get a text description of the most
recent error. If you are using the IEEE-488 port, the service request line can be setup to be
asserted if this occurs (see Section 4.5.2). There are two possible program message types
for every program message. Each of these two types starts with the same basic text referred
to as the program message header.
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 80
4.3.2.1
ENHANCED PROGRAM MESSAGE USING THE COMMAND TYPE
The COMMAND type of program message executes a process and can additionally
send data to the PPC2+ in the form of comma delimited arguments. This data is
usually a setting of some sort that is stored in the PPC2+. If data is specified, it must
be preceded by at least one white space from the program message header and be
within the range and format described in the program message description.
The keyword “Command:” will appear to the left of the required syntax in each
program message description.
If you are using the IEEE-488 port, the Command type does not generate a reply so
you do not need to wait for a reply. You also may send multiple program messages at
once by separating each program message with a semicolon. The commands will be
queued and executed in as received order.
If you are using the RS-232 port COM1, the Command type will always generate a
reply so you must wait for a reply before issuing another program message.
Because of this, you can only send one Command program message at a time while
using the COM1 port.
4.3.2.2
ENHANCED PROGRAM MESSAGE USING THE QUERY TYPE
The Query type of program message just requests data from the PPC2+. You must
wait for a reply with a query. If you send any type of program message to the PPC2+
after a Query before receiving a reply, the program message will be discarded and an
error will be generated. Errors are reporting using the IEEE Std. 488.2 status
reporting model. A Query program message always ends with a question mark.
Most queries will return a reply within 200 ms except:
PR?, PRR?, SR?, ATM?, RATE? Up to 2.0 seconds to allow a new measurement.
The syntax for using a QUERY program message is listed next to the keyword
“Query:” in each program message summary in Section 4.4.4.
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©2001 DH Instruments, Inc.
4.4 COMMANDS
4.4.1
PROGRAM MESSAGES
Shown are the basic program messages for the classic and the enhanced formats. There are
also additional IEEE Std. 488.2 common commands (they start with an ‘*’) that are common in
all IEEE-488.2 compatible devices These commands and the enhanced format status
reporting model are covered in Sections 4.5 and 4.6.
Table 12. Program Message List
#
Send a command string out of the PPC2+ COM2 port.
ABORT
Stop pressure generation.
AINCAL
To set or retrieve the measurement modifiers for the current range.
AINR
To request the next available measurement of the analog inputs.
AINRNG
To set or retrieve the current analog input range.
ATM
Read the current atmospheric pressure (on-board barometer).
AUTOZERO
Read or set the status of the automatic zero function.
AUTOPURGE
Read or set the status of the automatic purge function.
AUTOVAC
Read or set the status of the control reference (EXHAUST port).
COM1
Read or set the configuration of the COM1 port.
COM2
Read or set the configuration of the COM2 port.
CONFIG
Obsolete PPC2 Command.
DATE
Read or set the current date.
DEVICE
Obsolete PPC2 Command.
DF
Decrease the pressure quickly.
DP
Decrease the pressure a given amount.
DPG
Obsolete PPC2 Command.
DRV
Read or set the status of an the external valve drivers.
DS
Decrease pressure slowly.
ERR
Read the last error message.
HEAD
Read or set the head settings.
HOLD
Obsolete PPC2 Command.
HS
Read or set the current control hold limit in pressure.
HS%
Read or set the current control hold limit in percent full scale.
IF
Increase the pressure quickly.
IP
Slowly increase the pressure a given amount.
IS
Increase the pressure slowly.
ISO
Obsolete PPC2 Command.
LL
Read or set the lower limit for the current range (PPC2+ BG0002 model only)
LOCAL
Returns control to the PPC2+ front panel.
MEM
Read the power-up memory test status.
MODE
Read or set the current pressure control mode.
MSGFMT
Read or set the type of program message format to use.
NVENT
Read or set the status of the lo vent valve (PPC2+ BG0002 model only)
PASSTHRU
Send a command string out of the PPC2+ COM2 port.
PCALd,LO
Read or set the user LO RPT calibration information.
PCALd,HI
Read or set the user HI RPT calibration information.
PPC
Obsolete PPC2 Command.
PR
Read the next PPC2+ pressure.
PRR
Read the next PPC2+ PRT pressure, rate, and ATM.
PS
Set a new target pressure and start automated pressure control.
PSF
Set a new target pressure and use only the fast speed to reach the target.
PSH
Obsolete PPC2 Command.
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 82
Table 12. Program Message List (Continued)
PSS
Set a new target pressure and use only the slow speed to reach the target.
QPRR
Read the last PPC2+ RPT pressure, rate and ATM.
RANGE
Read or set the active range of the PPC2+.
RATE
Read the next available rate of change of pressure.
READY
Obsolete PPC2 Command.
READYCK
Read or set a flag that is cleared by a Not Ready (<↑> or <↓>) condition.
REMOTE
Enable remote local lockout operation.
RES
Read or set the pressure display resolution for the current transducer and range.
RESET
Reset the PPC2+ to the default user parameters.
RETURN
Start a new automated pressure control set using the current target value.
SCRSAV
Read or set the front panel screen saver period.
SN
Read the serial number of the PPC2+.
SR
Read the next available pressure status.
SS
Read or set the stability required for a Ready (<*>) condition.
SS%
Read or set the stability required for a Ready (<*>) condition (% FS/ s).
STAT
Read the pressure generation status.
TIME
Read or set the current time of day.
TOUT
Obsolete PPC2 Command.
TP
Read the current target pressure.
TS
Obsolete PPC2 Command.
UCOEF
Convert a pressure in Pascal to pressure in the current units.
UDU
Read or set the user defined pressure unit.
UL
Read or set the upper limit for the current range.
UNIT
Read or set the pressure unit for the current range.
VAC
Read or set the exhaust reference status flag.
VENT
Read, execute or abort a vent process.
VER
Read the PPC2+ software version.
ZNATERRd,HI
Read or set the autozero natural error for Hi RPT.
ZNATERRd,LO
Read or set the autozero natural error for Lo RPT.
ZOFFSETd,HI
Read or set the autozero offset for Hi RPT.
ZOFFSETd,LO
Read or set the autozero offset for Lo RPT.
PPC2+™ Operation and Maintenance Manual
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©2001 DH Instruments, Inc.
4.4.2
ERROR MESSAGES
The PPC2+ will always reply to a program message while using the classic format. If the
program message is incorrect or contains invalid data, an error number will be returned in the
form where n is an integer number that represents a specific error. This allows for
easy error trapping by the host computer.
In the enhanced format, each error is placed into the Error Queue as it occurs. The
query can then be used to remove from the queue and reply the text description of each error
that has occurred. If you are using the COM1 port, the Error Queue is cleared each time a
program message (except ) is received. Section 4.5 explains the details of the
Error Queue. Table 13 is a list of the possible errors numbers and the error description
for each.
Table 13. Error #’s and Descriptions
REPLY
DESCRIPTION
ERR #0
“OK”
ERR #2
“Text argument is too long”
ERR #3
“User defined coefficient cannot be 0”
ERR #4
“External device not detected”
ERR #5
“External device improperly configured”
ERR #6
“Numeric argument missing or out of range”
ERR #7
“Missing or improper command argument(s)”
ERR #8
“External device time-out error”
ERR #9
“Unknown command”
ERR #11
“Command missing argument”
ERR #12
“System overpressured” or “overpressure may result”
ERR #13
“Text detected in numeric field”
ERR #14
“User unit not defined”
ERR #16
“Not available with gauge units”
ERR #18
“Command not yet available”
ERR #19
“Not available with absolute units”
ERR #20
“Not available with gauge transducer”
ERR #21
“User device not defined”
ERR #22
“Pressure is not stable”
ERR #23
“Option not available or installed”
ERR #24
“Unit must be vented”
ERR #25
“Transducer out of calibration”
ERR #26
“COM port failed to initialize”
ERR #27
“Internal device#1 time-out error”
ERR #28
“Internal device#2 time-out error”
ERR #30
“Must be on range H3”
ERR #31
“Upper limit is too low”
ERR #32
“Not stable enough”
ERR #33
“Failed to generate pressure”
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 84
4.4.3
PROGRAM MESSAGE DESCRIPTION OVERVIEW
Each program message description is separated into the following sections:
Purpose
A brief description of the programs message’s function.
Command
This is the Enhanced program message syntax to send data to the PPC2+ or to
execute a PPC2+ function. The PPC2+ must be set to use the enhanced format
(see Section 4.3). It may be sent alone, or followed by at least one white space and
additional argument(s) to show that arguments can be passed. If there are multiple
arguments, then commas must separate them. If you are using the IEEE-488 port,
multiple Command type program messages can be sent in one message if you
separate them with a semicolon. There will be no reply from the PPC2+ using the
IEEE-488 port. If you are using the COM1 port, the PPC1 will reply and you must
wait for this reply. If this field is not listed in the program message description, then
the Command type is not supported when using the Enhanced format.
Query
This is the Enhanced program message syntax to request data from the PPC2+.
The PPC2+ must be set to use the enhanced format (see Section 4.3.2). The
PPC2+ will always reply to a query. You must wait for this reply before issuing
another program message. If this field (Query) is not listed in the program message
description, then the Query type for the program message is not supported when
using the Enhanced format.
Classic
This is the Classic program message syntax to send data to the PPC2+, to execute a
PPC2+ function, or to query for data. This type of command is not recommended for
new applications. The PPC2+ must be set to use the classic format (see Section
4.3). It may be followed by a ‘(=)’ and additional argument characters to show that
argument(s) can be passed. If there are multiple arguments, then commas must
separate them. The PPC2+ will always reply to a Classic program message. You
must wait for this reply before issuing another program message. If this field is not
listed in the program message description, then it is not supported when using the
classic format.
Arguments
If the program message can be used to set data inside the PPC2+, then this section
will describe the arguments and their limits.
Default
If the program message can be used to set data inside the PPC2+, then this line will
show (using the enhanced format) the default setting from the factory.
Remarks
This field has the details and remarks about the command.
Example
Examples are given for the enhanced and classic methods.
Enhanced: An example of the use of an enhanced method program message to be
sent to the PPC2+ is shown. The message sent to the PPC2+ appears after the
“Cmd sent:” label. If only a Query type exists, the “Query sent:” label is shown
instead. Directly under this label, “Query reply” shows a typical reply to a query type.
“Reply:” shows that a query format does not exist. It may have a short description
next to it.
Classic: An example of the use of a classic program message to be sent to the
PPC2+ is shown. The command sent to the PPC2+ appears after the “Cmd sent:”
label. The “Reply” label shows a typical reply to the “Sent” example. It may have a
short description next to it.
Errors
If the program message can report an argument error, the types of errors are listed.
If using the classic format or the COM1 port, the error message will be replied after
receiving the program message. If using the enhanced format via the IEEE-488 port,
the error condition will be handled by the status reporting model which will store the
errors in an Error Queue and can be programmed to assert the IEEE-488 SRQ line
to signal an error has occurred. In either case, the “ERR” or “ERR?” program
message can be used to retrieve a text description of the error.
See Also
Indicates related program messages (“----“) and refers to manual sections giving
detail on PPC2+ operation corresponding to the program message.
PPC2+™ Operation and Maintenance Manual
Page 85
©2001 DH Instruments, Inc.
4.4.4
PROGRAM MESSAGE DESCRIPTIONS
#
Purpose
To allow the host PC to communicate with a device connected to the PPC2+ COM2
port. This program message is obsolete. You should instead use the “PASSTHRU”
program message. This command is not available when using the enhanced
command format. Instead, use the “PASSTHRU” command.
Classic
“#xx”
Arguments
xx:
The string to send out of the COM2 port. It must be less than
40 characters long.
Remarks
The PPC2+ COM2 port can be used to communicate to another RS-232 device
(such as another PPC2+). This allows the user to use one COM port or IEEE-488
port on the host computer to communicate with the PPC2+ and another device.
A carriage return and a line feed () are added to the string.
After this program message is issued, the PPC2+ will reply back the first string
received by the PPC2+ COM2 port that is terminated with a carriage return. Line
feeds are discarded. This will discontinue when the next program message is sent to
the PPC2+.
There is no other reply from this program message. Prior to using this program
message, you must ensure that the PPC2+ COM2 port is correctly set up to
communicate with the device on COM2. Refer to the “COM2=“ program message.
Example
(classic)
Sent:
Reply:
“#VER”
“DH INSTRUMENTS, INC PPC2+ us A1000/A0015 Ver2.00 ”
This example assumes that a second PPC2+’s COM1 port is connected to the
PPC2+ COM2 port. This example gets the version of the second PPC2+.
See Also
“PASSTHRU”, “COM2”
abort
Purpose
Stops an active pressure generation. All control valves are closed. The exhaust and
transducer isolation valves are not affected.
Command
Classic
“ABORT”
“ABORT”
Remarks
This program message has no effect if the PPC2+ is not using automated pressure
control. When using automated pressure control, it will abort the control.
Example
(enhanced)
Cmd sent:
Reply:
“ABORT”
“ABORT” (no reply if IEEE-488)
Example
(classic)
Sent:
Reply:
“ABORT”
“ABORT”
See Also
Sections 3.2.3, 3.1.2.3
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 86
aincal
Purpose
To set or retrieve the measurement modifiers (adder multiplier) for the current analog
input range.
Query
Classic
“AINCALn a,m”
“AINCALn?”
“AINCALn=a,m”
“AINRNG”
Default
“AINRNGn 0,1”
Arguments
n:
a:
m:
The input channel to modify (1 through 4).
The adder modifier in the current range units (V, mV or mA).
The multiplier modifier.
Remarks
These modifiers allow the user to adjust the measurement displayed. The Adder
value is normally set at 0, and the multiplier is set to 1 to display the actual measured
value. The displayed measurement is calculated as:
Disp = (Meas m) + a
Example
(enhanced)
Cmd sent:
Query reply:
“AINCAL1.012, 1.002”
“0.012, 1.002”
Example
(classic)
Cmd Sent:
Reply:
“AINCAL=.012, 1.002”
“0.012, 1.002”
Errors
ERR# 6:
The argument(s) are invalid.
See Also
Sections 3.2.9, 5.4
ainR
Purpose
To request the next available measurement of the analog inputs.
Query
Classic
“AINR”
“AINR?”
Remarks
The PPC2+ measures the analog inputs every 0.75 seconds. This command
requests the next measurement cycle results from the PPC2+. The results are
returned for all four analog inputs at once, Input #1 measurement is first, followed by
the measurement unit. Then a comma is used to separate the first measurement
from the next field. This is repeated for inputs #2, #3, and #4. If an auto-calibration
cycle is occurring, “BUSY” will be returned instead.
Example
(enhanced)
Cmd sent:
Query reply:
“AINR?”
“0.797 mV, 0.934 mV, -0.027 mV, 1.234 mV”
Example
(classic)
Sent:
Reply:
“AINR”
“0.797 mV, 0.934 mV, -0.027 mV, 1.234mV”
See Also
Section 3.2.9
PPC2+™ Operation and Maintenance Manual
Page 87
©2001 DH Instruments, Inc.
AINRNG
Purpose
To set or retrieve the current analog input range.
Query
Classic
“AINRNG n”
“AINRNG?”
“AINRNGn”
“AINRNG?”
Default
“AINRNG 3”
Arguments
n:
The input range index
1 for 100 mv range
2 for 5 Volt range
3 for 10 Volt range
4 for 4-20 ma range
Remarks
The analog input option has 4 ranges. The selected range affects all four of the
inputs at once. When a range is changed, an auto-calibration cycle occurs, which
takes about 10 seconds.
Example
(enhanced)
Cmd sent:
Query reply:
“AINRNG 2”
“2”
Example
(classic)
Cmd Sent:
Reply:
“AINRNG=2”
“2”
Errors
ERR# 6:
The argument(s) are invalid.
See Also
Section 3.2.9
ATM
Purpose
Reads the next measured internal ambient pressure.
Query
Classic
“ATM?”
“ATM”
Remarks
The atmospheric pressure as measured by the PPC2+ on-board barometer will be
returned in the current pressure units (always absolute). This measurement is
followed by the units text.
Example
(enhanced)
Query sent:
Query reply:
“ATM?
“97.123 kPaa”
Example
(classic)
Sent:
Reply:
“ATM
“97.123 kPaa”
See Also
Section 3.4.4.7
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 88
AUTOPURGE
Purpose
Read or set the status of the automatic purge function.
Command
Query
“AUTOPURGE n”
“AUTOPURGE?”
Classic
“AUTOPURGE=n”
“AUTOPURGE”
Default
“AUTOPURGE 0”
Arguments
n:
’0’ To disable AUTO mode.
’1’ To enable AUTO mode.
Remarks
The PPC2+ can automatically control the external SPLT functions if desired.
Example
(enhanced)
Cmd sent:
Query reply:
“AUTOPURGE 1”
“0” (if PURGE not enabled)
“1” (if PURGE enabled)
Example
(classic)
Sent:
Query reply:
“AUTOPURGE=1”
“AUTOPURGE=0” (if PURGE not enabled)
“AUTOPURGE=1” (if PURGE enabled)
Errors
ERR# 6:
The argument was other than a ‘0’ or a ‘1’.
See
Sections 3.4.4.8, 3.2.8
AUTOVAC
Purpose
Read or set the status of the automated Control Ref determination mode.
Command
Query
“AUTOVAC n”
“AUTOVAC?”
Classic
“AUTOVAC=n”
“AUTOVAC”
Default
“AUTOVAC 1”
Arguments
n:
’0’ To disable AUTO mode.
’1’ To enable AUTO mode. This will override the manual selection.
Remarks
The PPC2+ has an internal sensor that can be used to automatically determine if the
EXHAUST port is open to atmosphere or to a vacuum. You can disable it to
manually override it.
Example
(enhanced)
Cmd sent:
Query reply:
“AUTOVAC 1”
“0” (if not in AUTO mode)
“1” (if in AUTO mode)
Example
(classic)
Sent:
Query reply:
“AUTOVAC=1”
“AUTOVAC=0” (if not in AUTO mode)
“AUTOVAC=1” (if in AUTO mode)
Errors
ERR# 6:
The argument was other than a ‘0’ or a ‘1’.
See Also
Section 3.3.1, “VAC” program message
PPC2+™ Operation and Maintenance Manual
Page 89
©2001 DH Instruments, Inc.
AUTOZERO
Purpose
Read or set the status of the automatic zero function.
Command
Query
“AUTOZERO n”
“AUTOZERO?”
Classic
“AUTOZERO=n”
“AUTOZERO”
Default
“AUTOZERO 1”
Arguments
n:
’0’ Autozero OFF
’1’ Autozero ON
Remarks
The PPC2+ autozero function can be turned ON and OFF.
Example
(enhanced)
Cmd sent:
Query reply:
“AUTOZERO 1”
“0” If autozero OFF
“1” If autozero ON
Example
(classic)
Sent:
Query reply:
“AUTOZERO=1”
“AUTOZERO=0” If autozero OFF
“AUTOZERO=1” If autozero ON
Errors
ERR# 6:
The argument was other than a ‘0’ or a ‘1’.
See Also
Section 3.4.1
COM1
Purpose
Read or set the RS-232 settings for the COM1 port.
Command
Query
“COM1 baud, parity, data, stop”
“COM1?”
Classic
“COM1=baud, parity, data, stop”
“COM1”
Arguments
baud:
The baud rate. This may be ‘300’, ‘600’,’1200’,’2400’,’4800’, ‘9600’
or ‘19200’
parity:
The data parity. This may be ‘O’ for odd, ‘E’ for even, or ‘N’ for none.
data:
The number of data bits. This may be ‘7’ or ‘8’
stop:
The number of stop bits. This may be ‘1’ or ‘0’
Defaults
“COM1 2400,E,7,1”
Remarks
The COM1 port is used to communicate to the PPC2+. When the COM1 port
configuration of the PPC2+ is changed, the program message reply (COM1 use only)
will be sent at the old COM1 settings, but all subsequent communications will be
accomplished at the new COM1 settings.
Example
(enhanced)
Cmd sent:
Query reply:
“COM1 9600,N,8,1”
“9600,N,8,1”
Example
(classic))
Sent:
Reply:
“COM1=9600,N,8,1”
“9600,N,8,1”
Errors
ERR# 7:
Missing or improper program message argument(s).
See Also
Section 3.4.4.1, “PASSTHRU”
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 90
COM2
Purpose
Read or set the RS-232 settings for the COM2 port.
Command
Query
“COM2 baud,parity,data,stop”
“COM2?”
Classic
“COM2= baud,parity,data,stop”
“COM2”
Arguments
baud:
The baud rate. This may be ‘300’, ‘600’,’1200’,’2400’,’4800’, ‘9600’
or ‘19200’
parity:
The data parity. This may be ‘O’ for odd, ‘E’ for even, or ‘N’ for none.
Data:
The number of data bits. This may be ‘7’ or ‘8’
stop:
The number of stop bits. This may be ‘1’ or ‘0’
Defaults
“COM2 2400,E,7,1”
Remarks
The COM2 port can be used to allow the host computer to communicate through the
PPC2+ to an additional device connected to COM2. This can be useful if the Host
computer does not have 2 serial ports available.
Example
(enhanced)
Cmd sent:
Query reply:
“COM2 9600,N,8,1”
“9600,N,8,1”
Example
(classic)
Sent:
Reply:
“COM2=9600,N,8,1”
“9600,N,8,1”
Errors
ERR# 7:
Missing or improper program message argument(s).
See Also
Section 3.4.4.3, “PASSTHRU”
CONFIG
This is an obsolete PPC2 Command
Purpose
PPC2+ does not support a remotely activated configuration routine. The CONFIG
command from PPC2 will reply as if CONFIG had occurred.
See
Section 3.4.4.1
DATE
Purpose
Read or set the PPC2+ date.
Command
Query
“DATE yymmdd”
“DATE?”
Classic
“DATE=yymmdd”
“DATE”
Arguments
yymmdd:
The date in the numerical only format year-month-day with no
spaces.
Remarks
The PPC2+ has an internal real time calendar clock. It is used for date stamping
calibrations.
Example
(enhanced)
Cmd sent:
Query reply:
“DATE 961201”
“961201”
Example
(classic)
Sent:
Reply:
“DATE=961201”
“961201”
Errors
ERR# 7:
Missing or improper program message argument(s).
See Also
Section 3.4.4.4
PPC2+™ Operation and Maintenance Manual
Page 91
©2001 DH Instruments, Inc.
DEVICE
This is an obsolete PPC2 Command.
Purpose
PPC2+ does not support external devices so the “DEVICE” Command is not
supported. Will respond ERR# 9.
See
None
DF
Purpose
Decrease the pressure quickly.
Command
“DF n”
Classic
“DF=n”
Arguments
‘0’
‘1’
Closes the fast down valve.
Opens the fast down valve.
Remarks
Opening the fast down valve will cause the pressure to decrease quickly.
Example
(enhanced)
Cmd sent:
Reply:
“DF 1”
“1” (no reply if IEEE-488)
Example
(classic)
Sent:
Reply:
“DF=1”
“DF=1”
Errors
ERR# 6:
The n argument is a ‘0’ or a ‘1’.
See Also
Section 5.8.1.7
DP
Purpose
Decrease the pressure slowly a given amount using the slow speed.
Command
“DP n”
Classic
“DP=n”
Arguments
n
The decrease in pressure desired (current pressure units). This can
be from 0 to 2 % FS of the current RPT range.
Remarks
The slow speed will be used for a calculated amount of time (up to 5 seconds) to
create the desired change. The PPC2+ will not attempt to control the pressure to a
target, so the change in pressure will be approximate.
Example
(enhanced)
Cmd sent:
Reply:
“DP 2”
“2.000 kPa”(no reply if IEEE-488)
Example
(classic)
Sent:
Reply:
“DP=2”
“2.000 kPa”
Errors
ERR# 6:
The n argument is not within given limits.
See Also
None.
DPG
This is an obsolete PPC2 Command.
Purpose
PPC2+ does not support external devices so the “DPG” command is not supported.
Will respond ERR# 9.
See
None
PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 92
DRVN
Purpose
Read or set the status of the external electrical driver.
Command
Query
“DRVn x”
“DRVn?”
Classic
“DRVn=x”
“DRVn”
Arguments
n
x
The driver to operate. This can be from 1 to 8.
The state to change the driver to; ‘0’ to de-activate it, ‘1’ to activate it.
Remarks
The PPC2+ control has eight optional external drivers.
Example
(enhanced)
Cmd sent:
Query reply:
“DRV1 1”
“1”
Example
(classic)
Sent:
Reply:
“DRV1=1”
“DRV1=1”
Errors
ERR# 6:
The n or x arguments are not within given limits.
See Also
Section 3.3.4
DS
Purpose
Decrease the pressure slowly.
Command
“DS n”
Classic
“DS=n”
Arguments
n
‘0’ Closes the slow down valve.
‘1’ Opens the slow down valve.
Remarks
Opening the slow down valve will cause the pressure to decrease slowly.
Example
(Enhanced)
Cmd sent:
Reply:
“DS 1”
“1” (no reply if IEEE-488)
Example
(Classic)
Sent:
Reply:
“DS=1”
“DS=1”
Errors
ERR# 6:
The n argument is a ‘0’ or a ‘1’.
See Also
Section 5.8.1.7
ERR
Purpose
Read the new available error message from the Error Queue.
Query
“ERR?”
Classic
“ERR”
Remarks
This program message obtains additional details about an error that has occurred. If
the user receives an “ERR# nn” reply, or the enhanced mode is enabled using the
IEEE-488 interface and an error has been detected, the error is put into a FIFO Error
Queue. The “ERR” program message pulls and replies the oldest error message
available. “OK” will be replied if there are no error messages left.
Example
(enhanced):
Query sent:
Query reply:
“ERR?”
“Numeric argument missing or out of range”
Example
(classic)
Sent:
Reply:
“ERR”
“Numeric argument missing or out of range”
See Also
Section 4.4.2
