TPI 270 Instruction Manual

A. INTRODUCTION 1. Congratulations ..........................3 2. Product Description....................3 3. Declaration of Conformity ..........4 B. SAFETY CONSIDERATIONS ..............5 C. TECHNICAL DATA 1. Features and Benefits..................6 2. Product Applications ..................7 3. Specifications..............................8 D. MEASUREMENT TECHNIQUES 1. Controls and Functions ............12 2. Step by Step Procedures: ........14 E. OTHER FEATURES ..........................24 F. APPLICATION NOTES ......................29 G. TROUBLE SHOOTING GUIDE ..........34 H. MAINTENANCE ................................35 I. ACCESSORIES ................................36 2

to use and is built to last. It is backed by a 3 year limit- ed warranty. Please remember to complete and return your product warranty registration card. 2. Product Description The slim design 270 is a hand-held, autoranging clamp-on DMM. Extra large numerals, min/max, capaci- tance, DC microamps and duty cycle are just a few of the features of the 270. An affordable choice, the 270 offers measurements in all basic electrical functions with addi- tional advanced features like non-contact voltage. The 270 comes complete with the following accessories: Carrying Pouch Test Lead Set Temperature Probe Instruction Manual Battery & Fuse .3 .3 .4 .5 .6 .7 .8 2 4 24 29 34 35 36 3

This is to certify that TPI Model 270 conforms to the protection requirements of the council directive 89/336/EEC, in the approximation of laws of the member states relating to Electromagnetic compatibility and 73/23/EEC. The Low Voltage Directive by application of the following standards: EN 50081-1 1992 Emissions Standard EN 50082-1 1992 Immunity Standard EN 61010-1 1993 Safety Standard EN 61010-2-031 1995 Safety Standard EN 61010-2-032 1995 Safety Standard To ensure conformity with these standard, this instru- ment must be operated in accordance with the instruc- tions and specifications given in this manual. CAUTION: Even though this instrument complies with the immunity standards, it’s accuracy can be affected by strong radio emissions not covered in the above standards. Sources such as hand-held radio trans- ceivers, radio and TV transmitters, vehicle radios and cellular phones generate electromagnetic radiation that could be induced into the test leads of this instru- ment. Care should be taken to avoid such situations or alternatively, check to make sure that the instrument is not being influence by these emissions. CAUTION: Please follow manufacturers test proce- dures whenever possible. Do not attempt to measure unknown voltages or components until a complete understanding of the circuit is obtained. 4

WARNING: Please follow manufacturers test procedures whenever possible. Do not attempt to measure unknown voltages or components until a complete understanding of the circuit is obtained. GENERAL GUIDELINES ALWAYS • Test the 270 before using it to make sure it is operating properly. • Inspect the test leads before using to make sure there are no breaks or shorts. • Double check all connections before testing. • Have someone check on you periodically if working alone. • Have a complete understanding of the circuit being measured. • Disconnect power to circuit, then connect test leads to the 270, then to circuit being measured. NEVER • Attempt to measure unknown high voltages. • Attempt to measure DC microamps with the meter in parallel to the circuit. • Connect the test leads to a live circuit before setting up the instrument. • Touch any exposed metal part of the test lead assembly. e mber of u- uc- with ted e and n stru- ns or ent is - sure 5

AC (Alternation Current) DC (Direct Current) REFER TO INSTRUCTION MANUAL GROUND DOUBLE INSULATION EITHER DC OR AC C. TECHNICAL DATA 1. Features and Benefits Agency Meets CE and IEC 1010. Analog Bar Displays rapidly changing input Graph signals. NCV Non-contact voltage detection. Detect the presence of voltage without con- tacting the circuit. P-H Captures min / max peak. MAX/MIN Records Min/Max readings for all functions and ranges. REL Measurements made are displayed relative to a stored value. Auto Off Automatically powers off after 30 minutes of inactivity. 2. Perf the HVA DCm ACA ACV ACV DCm OHM OHM CAP ACA Hz TEM ALL ELE ACV ACA OHM DCV ACA ELE ACV ACA OHM 6

Perform the following tests and/or measurements with the 270 and the appropriate function: HVAC/R DCmV • Thermocouples in furnaces. ACA • Heat anticipator current in thermostats. ACV • Line voltage. ACV or DCV • Control circuit voltage. DCmA • Flame safegaurd control current. OHMS • Compressor winding resistance. OHMS • Continuity of wiring. CAP • Motor start and run capacitors. ACA • Motor and compressor start up current. Hz • Frequency on controls and line voltage. TEMP • Air duct temperatures. ALL • Bar graph to indicate rapid fluctuations. ELECTRICAL ACV • Measure line voltage. ACA • Measure line current. OHMS • Continuity of circuit breakers. DCV • Voltage of direct drive DC motors. ACA • Start up current of motors, relays, contactors and transformers. ELECTRONIC ACV • Measure power supply voltage. ACA • Measure power supply current. OHMS • Continuity of circuit breakers and fuses. 7

CAT II - 1000V CAT III - 600V Pollution Degree 2 Temperature for gauranteed accuracy: 23ºC +5ºC DC VOLTS Range Res. Accuracy 400mV 0.1mV Impedance: 4V 0.001V +/-(0.5% of reading + 2 digits) 10MW 40V 0.01V Overload Protection: 400V 0.1V 600VDC or AC RMS 600V 1V (45Hz to 100Hz Frequency Response 400mV Range) AC VOLTS (45Hz to 450Hz Frequency Response All Other Ranges) Range Res. Accuracy 400mV 0.1mV +/-(1.2% of reading + 5 digits) Impedance: 4V 0.001V +/-(1.2% of reading + 3 digits) 10MW 40V 0.01V Overload Protection: 400V 0.1V +/-(1.5% of reading + 3 digits) 600VDC or AC RMS 600V 1V 8 DC M Range 40uA 400uA *DC mic the circu OHM Range 400W 4kW 40kW 400kW 4MW 40MW Frequ Range 4.000kH 40.00kH 400.0kH 4.000MH 40.00MH 400.0MH UL 3111 Pending (45Hz to 100Hz Frequency Response 200A to 400A) AC AMPS (45Hz to 450Hz Frequency Response Below 200A) Range Res. Accuracy 40A 0.01A +/-(3.0% of reading + 5 digits) 400A 0.1A e

ange) Ranges) nce: d Protection: C or AC RMS DC Microamps Range Res. Accuracy 40uA 0.01mA +/-(0.8% of reading + 2 digits) Overload Protection: 400uA 0.1mA 0.5A / 600V Fusee *DC microamps are measured with the test leads in series with the circuit under test. OHM (Resistance, W) Range Res. Accuracy 400W 0.1W ±(1% of reading +5 digits) 4kW 0.001kW ±(1% of reading +2 digits) Overload Protection: 40kW 0.01kW 250VDC or AC RMS 400kW 0.1kW 4MW 0.001MW ±(3% of reading +5 digits) 40MW 0.01MW ±(3% of reading +10 digits) Frequency (Hz) Range Res. Accuracy 4.000kHz 0.001kHz ±(1% of reading +2 digits) 40.00kHz 0.01kHz 400.0kHz 0.1kHz Overload Protection: 4.000MHz 0.001MHz 250VDC or AC RMS 40.00MHz 0.01MHz 400.0MHz 0.1MHz nding 400A) 0A) Warning: Use only correct type and overvoltage category rated test leads. Remove the temperature probe when using the test leads or amp clamp.

1.5mA MAX 250 V DC or AC RMS Continuity Buzzer Test Voltage Threshold Over Load Protection 3V <35W 250 V DC or AC RMS Non-Contact Voltage (NCV) Detection Range: 24VAC and above Temperature (K-Type thermocouple) Range Res. Accuracy -40ºF to 399.9ºF 0.1ºF +(1ºF) 32.0ºF to 120.0ºF + (1%+1.5ºF) -4.0ºF to 31.9ºF + (1%+1.5ºF) -120.1ºF to 399.9ºF + (2%+4ºF) -40.0ºF to -3.9ºF -40ºF to 1000ºF 1ºF +(2ºF) 32.0ºF to 120ºF + (1%+2ºF) -3ºF to 749ºF + (2%+1.5ºF) 750ºF to 1000ºF + (2%+4ºF) -40ºF to -4ºF Overload Protection: 60VDC or 30VAC RMS **Celsius version of the 270 is available 10 Ca Ran 4nF 40nF 400n 4mF 40m 400m 4mF 40m nF= Ge Max inpu Fuse Disp Ope Stor Rela Pow Batt Size Wei Warning: Use only correct type and overvoltage category rated test leads. Remove the temperature probe when using the test leads or amp clamp.

40nF 0.01nF 400nF 0.1nF Overload Protection: 4mF 0.001mF 500VDC or AC RMS 40mF 0.01mF 400mF 0.1uF 4mF 0.001mF 40mF 0.01mF ±(3% of reading +5 digits) nF= nanofarad, mF= microfarad, mF= millifarad General Max Voltage between any 600V input and ground Fuse Protection (mA range) 0.5A/600V Display Type 4000 Count 41 seg. bargraph Operating Temperature 32ºF to 104ºF (0ºC to 40ºC) Storage Temperature 14ºF to 122ºF (-10ºC to 50ºC) Relative Humidity 80% non-condensing Power Supply 9V (MN1604) Battery Life 80 hrs. typical Size (H x L x W) 32.5mm x 255mm x 65mm (1.3in x 10in x 2.5in) Weight 363g (0.8lbs) e e st Warning: Use only correct type and overvoltage category rated test leads. Remove the temperature probe when using the test leads or amp clamp.

1. Controls and Functions: Push Buttons REL Activates Relative mode. Press and hold for 2 seconds to deacti- vate. D-H Holds the reading on the display until the button is pushed a second time. R-H Activates manual ranging. Press and hold for 2 seconds to return to auto ranging. MAX MIN Activates record mode. Press to cycle between maximum and min- imum recorded reading. Press and hold for 2 seconds to return to normal mode. P-H Activates peak hold mode. Used to capture in-rush current. NCV Activates the non-contact voltage detection feature. Press and hold while holding the jaw close to electrical wires.

Rotary Switch OFF Turns the 270 completely off. V Used to measure DC volts. V Used to measure AC volts. W Used to measure resistance. Used to measure continuity. Selects diode test function. Selects capacitance test function. Hz Selects frequency test function. mA Selects DC microamp function. Used to measure AC amperage. TEMP Selects the temperature function. Input Jacks COM Black test lead connection for all tests except temperature, non-con- tact voltage and AC Amps. V/W/mA Red test lead connection for all tests except temperature, non-con- tact voltage and AC Amps. ti- ay s rn o min- and d to ge ld

Measuring DC Voltage WARNING! Do not attempt to make a voltage measurement of more than 600V or of a voltage level that is unknown. Make sure the temperature probe is NOT plugged in during this test. Instrument set-up: FUNC. BLACK RED MIN MAXI TEST LEAD TEST LEAD READING READING COM V/W 0.1mV 600V Measurement Procedure: 1. Disconnect power to circuit to be measured. 2. Plug black test lead into the COM input jack. 3 Plug red test lead into the V/W input jack. 4. Set rotary switch to the V range. 5. Connect test leads to circuit to be measured. 6. Reconnect power to circuit to be measured. 7. Read the voltage on the 270. Optional Modes (See Other Features Section) • D-H: Freezes the reading on the LCD. • MAX/MIN: Records minimum a. • P-H: Displays peak voltage. 14

WARNING! Do not attempt to make a voltage measurement of more than 600V or of a voltage level that is unknown. Make sure the tem- perature probe is NOT plugged in during this test. Instrument set-up: FUNC. BLACK RED MIN MAX TEST LEAD TEST LEAD READING READING COM V/W 0.1mV 600V Measurement Procedure: 1. Disconnect power to circuit to be measured. 2. Plug black test lead into the COM input jack. 3 Plug red test lead into the V/W input jack. 4. Set rotary switch to the V range. 5. Connect test leads to circuit to be measured. 6. Reconnect power to circuit to be measured. 7. Read the voltage on the 270. Optional Modes (See Other Features Section) • D-H: Freezes the reading on the LCD. • MAX/MIN: Records minimum and maximum measurements. • P-H: Displays peak voltage. more ke sure s test. G 15

energized. For best results, remove the resistor completely from circuit before attempting to measure it. Make sure the tempera- ture probe is NOT plugged in during this test. NOTE: To make accurate low ohm measurements, short the ends of the test leads together and press the REL button to store the reading. This will deduct the stored value from subsequent measurements eliminating the test lead resistance from the reading. Instrument set-up: FUNC. BLACK RED MIN MAX TEST LEAD TEST LEAD READING READING W COM V/W 0.1W 40.00MW Measurement Procedure: 1. Disconnect power to circuit to be measured. 2. Plug black test lead into the COM input jack. 3. Plug red test lead into V/W input jack. 4. Set the rotary switch to the W function. 5. Connect test leads to circuit to be measured. 6. Read the resistance value on the 270. Optional Modes (See Other Features Section) • D-H: Freezes the reading on the LCD.

CAUTION! Do not attempt to make a current measurement with the test leads. The 270 measures the current by clamping the jaw around one conductor (wire). Clamping around more than one wire will result in erroneous readings. Make sure the temperature probe is NOT plugged in during this test. Instrument set-up: FUNC. BLACK RED MIN MAX TEST LEAD TEST LEAD READING READING NOT USED NOT USED 0.01A 400A Measurement Procedure: 1. Disconnect power to circuit to be measured. 2. Set rotary switch to function. 3. Clamp the jaws around one conductor of the circuit to be measured. For best results, center the wire in the jaw. 4. Reconnect power to circuit to be measured. 5. Read the current on the 270. Optional Modes (See Other Features Section) • D-H: Freezes the reading on the LCD. • MAX/MIN: Records minimum and maximum measure- ments • P-H: Displays peak amperage. 17 rcuit tely from mpera- s of the reading. rements

energized. Make sure the temperature probe is NOT plugged in during this test. Instrument set-up: FUNC. BLACK RED TEST LEAD TEST LEAD COM V/W Measurement Procedure: 1. Disconnect power to circuit to be measured. 2. Plug black test lead into the COM input jack. 3. Plug red test lead into V/W input jack. 4. Set the rotary switch to the position. 5. Connect test leads to circuit to be measured. 6. The 270 will beep and the LED will illuminate at resistances of 35W or lower. Optional Modes (See Other Features Section) • D-H: Freezes the reading on the LCD.

energized. For accurate tests, remove the diode completely from the circuit prior to measuring it. Make sure the tempera- ture probe is NOT plugged in during this test. Instrument set-up: FUNC. BLACK RED TEST LEAD TEST LEAD COM V/W/mA Measurement Procedure: 1. Disconnect power to circuit to be measured. 2. Plug black test lead into the COM input jack. 3. Plug red test lead into V/W input jack. 4. Set the rotary switch to the 5. Connect the black test lead to the banded end of the diode (cathode) and the red test lead to the non-banded end of the diode (anode). 6. For a good diode, the reading on the display should be between 0.5V and 0.8V. The reading will be lower for a germanium diode. 7. Reverse the leads on the diode. 8. For a good diode, the reading on the display should be OL (overload). Optional Modes (See Other Features Section) • D-H: Freezes the reading on the LCD. 19 position. circuit ugged at

circuits with all capacitors discharged only. Failure to de-energize and discharge capacitors prior to measuring them could result in instrument damage and/or personal injury. Make sure the temper- ature probe is NOT plugged in during this test. Instrument set-up: FUNC. BLACK RED TEST LEAD TEST LEAD COM V/W/mA Measurement Procedure: 1. Disconnect power to circuit to be measured. 2. Plug black test lead into the COM input jack. 3. Plug red test lead into V/W input jack. 4. Set the rotary switch to the 5. Remove the capacitor from the circuit and discharge it. 6. Connect test leads to the capacitor to be measured. Observe polarity on polarity sensitive capacitors. 7. Read the capacitor value on the LCD. Optional Modes (See Other Features Section) • D-H: Freezes the reading on the LCD. 20 Meas W Nev gre que mo dur Ins FUN Hz Meas 1. Dis 2. Plu 3. Plu 4. Set 5. Re 6. Re Optiona • D-H • MA me position.

greater than 500V. Determine the voltage of any unknown fre- quency source before connecting the instrument in frequency mode. Make sure the temperature probe is NOT plugged in during this test. Instrument set-up: FUNC. BLACK RED TEST LEAD TEST LEAD Hz COM V/W/mA Measurement Procedure: 1. Disconnect power to the circuit to be measured. 2. Plug black test lead into the COM input jack. 3. Plug red test lead into V/W input jack. 4. Set the rotary switch to the Hz position. 5. Reconnect power to the circuit to be measured. 6. Read the frequency on the LCD. Optional Modes (See Other Features Section) • D-H: Freezes the reading on the LCD. • MAX/MIN: Records minimum and maximum measure- ments

CAUTION! Do not attempt to make a current measurement with the test leads connected in parallel with the circuit to be tested. Test leads must be connected in series with the circuit. Do not attempt to make a current measurement of circuits with more than 600V present. Instrument damage and/or personal injury may result. Make sure the temperature probe is NOT plugged in during this test. Instrument set-up: FUNC. BLACK RED MINIMUM MAXIMUM TEST LEAD TEST LEAD READING READING COM V/W /mA 0.01mA 400.0mA Measurement Procedure: 1. Disconnect power to circuit to be measured. 2. Plug black test lead into the COM input jack. 3. Plug red test lead into the V/W/mA input jack. 4. Set the rotary switch to the mA function. 5. Connect the test leads in series to the circuit to be measured. 6. Reconnect power to circuit to be measured. 7. Read the current on the 270. Optional Modes (See Other Features Section) • D-H: Freezes the reading on the LCD. • MAX/MIN: Records minimum and maximum measure- Measu CA Do tes ins Instrum FUNC. 400ºF 1000ºF Measu 1. 2. 3. 4. 5 N Optiona • D-H • MAX/ • REL 22

re- 23 Measuring Temperature CAUTION! Do not attempt to make a temperature measurement with the test leads connected to the 270. Remove the test leads and insert the K-type temperature probe. Instrument set-up: FUNC. BLACK RED MINIMUM MAXIMUM TEST LEAD TEST LEAD READING READING 400ºF N/A N/A -40.0ºF 399.9ºF 1000ºF N/A N/A -40ºF 1000ºF Measurement Procedure: 1. Remove the test leads from the input jacks. 2. Observing polarity, insert the temperature probe into the Type K input jack. 3. Set the rotary switch to the appropriate function for the temperature being measured. 4. Touch the temperature probe to the item to be measured. 5 . Read the temperature on the LCD. Note:The 270 will beep when no probe is connected to the temperature input. Optional Modes (See Other Features Section) • D-H: Freezes the reading on the LCD. • MAX/MIN: Records minimum and maximum measure ments. • REL: Enables temperature differential tests to be per formed. See Application Notes section.

Non-Contact Voltage (NCV) WARNING! Never rely on the non-contact voltage function only. If a volt- age is not detected, confirm there is no voltage by performing a voltage measurement with the test leads. Failure to do this could result in injury. The non-contact voltage feature works best when testing single wires. Make sure the test leads and temperature probe are disconnected while using the NCV fea- ture. Instrument set-up: FUNC. BLACK RED TEST LEAD TEST LEAD NCV N/A N/A Measurement Procedure: Remove the test leads and temperature probe prior to using the NCV feature. 1. Turn the meter on to any range. 2. Press and hold the NCV button. 3. Put the arrow marked on the jaw close to the wire under test. 4. If voltage is present the 270 will beep and the NCV LED will illuminate. 5. If voltage is not detected, confirm the result by perform- ing a voltage measurement as outlined earlier in this manual.

Relative mode (REL) The Relative mode (REL) takes the reading on the dis- play at the time the REL button is pressed and uses it as a reference value that is deducted from all subsequent measurements. This can be very helpful in deducting the resistance of test leads in low ohm measurements. 1. To use Relative mode manually select the range for the function. 2. Depress the REL button to store the reading on the display. The “REL” indicator will illuminate con- firming the 270 is in relative mode. 3. Now when making a measurement the value stored will be deducted from the actual reading. 4. To see what the stored value is, depress the REL button again and the “REL” indicator will flash and the reading on the display will show the stored value. Depress the REL button again to return to REL mode. 5. To clear or exit relative mode, press and hold the REL button for approximately two seconds and the 270 will beep and return to normal operation. Note: Differential temperature measurements can be made using relative mode. See the application note on page 33 for more information. volt- orming do this works s and CV fea- the under V LED rform- is

Record Mode (MAX / MIN) Record mode allows you to record the maximum and minimum readings measured during a test. 1. Manually select the range for the function and set the meter up to perform a measurement as outlined earlier in this manual. 2. Depress the MAX/MIN button and “MAX” will be displayed along with the maximum reading record- ed. Press the MAX/MIN button again and the display will show MIN and the minimum reading recorded. 3. Press the MAX/MIN button again and MAX MIN will blink and the 270 will display the measured value in real time. Steps 2 and 3 can be repeated to read the maximum and minimum recorded values. If REL was activated and is being used with MAX/MIN, REL and MAX MIN will blink and the dis- play will show the REL value instead of the real time reading. 5. To exit record mode, press and hold the MAX/MIN button for approximately two seconds and the 270 will beep and return to normal operation.

Peak Hold Mode (P-H) The Peak hold function allows the 270 to display the the maximum and minimum peak voltage or current. This is helpful when measuring inrush current. NOTE: Peak mode can display up to 70 counts on the dis- play when first activated. For example, if the 270 is set to the ACA function and manually ranged to the 40A range, when P-H is activated the display can read up to 0.70. This is normal for this function. 1. Manually select the range for the function and set the meter up to perform a measurement as outlined earlier in this manual. 2. Depress and hold the P-H button until CAL is dis- played. Once CAL clears from the display you may make a measurement. Press P-H repeatedly to cycle through the maximum and minimum peak readings. Press and hold the P-H button for two seconds to return to normal operation. For inrush current, after CAL clears press the P-H button and then supply power to the device under test. The 270 will capture the maximum and mini- mum peak inrush. and d set outlined l be ecord- display orded. MIN will value in ead the the dis- eal time X/MIN he 270

Manual Ranging (R-H) The range hold button (R-H) activates manual ranging. Press the R-H button to cycle through available ranges. Pressing and holding the R-H button for approximately two seconds returns the meter to autorange mode and “auto” will be displayed in the upper left corner of the display. Data Hold (D-H) Press the D-H button at any time to freeze the reading on the LCD display. This function is useful when measuring in locations where the display is difficult to read. LED Indicators The 270 is equipped with three LED indicators at the top near the jaw. HI-V This indicator flashes and the 270 beeps when the test leads are in contact with a voltage of 30V AC/DC or more. NCV This indicator illuminates when the non- contact voltage detector senses a voltage. This is the visual indicator of continuity. This LED also flashes anytime the buzzer beeps.

Disconnect power from the terminal block, find the fuse or circuit breaker that con- trols the block and turn it off. Set up the meter following the steps under “Measurement Procedure” on page 15. Then proceed with the following: •Connect the red test lead to the hot side of the block and the black lead to the neutral side of the block. Reconnect power to the block and read the voltage on the meter. The reading should be approximately 110V to 130V. • Disconnect power from the block and move the red wire to ground. Reconnect power to the block and read the voltage on the meter. Typically less than 20V should exist from neutral to ground. If 110V or above exists, the block may be wired incorrectly. two o” will on the p near s

The 270 will accurately measure rectified DC Voltages like those encountered in furnaces and other appliances even though many of these devices do not have output filtering or other signal conditioning. When measuring DC Voltage of a bat- tery, the most accurate reading can be attained by testing the battery under load. To accomplish this, follow steps 1 through 4 shown on page 14 and the following (with the battery in holder and device turned on): • Connect the red test lead from the meter to the positive (+) terminal of the battery. • Connect the black test lead to the negative (-) terminal of the battery. Applic

sure the power is disconnected prior to testing. Set up meter following steps under “Measurement Procedure” on page 16, and proceed with the following: • Connect the red test lead to one power input line of the motor and the black test lead to the other power input line of the motor. In most applications if the reading is OFL, the motor winding is open. • Connect the red test lead to the frame of the motor and the black test lead to the winding. In most applications if a reading of 0 Ohms is displayed, the winding is shorted to the motor frame (ground). ages like es even filtering at- be r ps he al e ry. Application Notes (Resistance)

When measuring AC Amps of a motor there are two types of measurements that can be made, running current and in-rush or start-up current. Start-up current will usually be much higher than running current. Set up the meter following the steps under “Measurement Procedure” on page 17, and then proceed with the following: • Clamp the meter around a single wire and reconnect power to the device. Read the current displayed on the meter. This is the running current of the motor. • Disconnect power to the motor and put the meter in PEAK HOLD mode. Reconnect the power and read the current displayed on the meter. This is the in-rush or start-up current of the motor.

When measuring temperature there may be applica- tions when knowing the differential between two mea- surements is required. This can be accompished by following these steps. • Remove the test leads from the input jacks. Insert the K-type thermocouple probe into the input jack on the 270. Set the 270 to the desired TEMP function. • Touch the temperature probe sensor to the device under test (T1). • When the reading stabilizes, press the REL but- ton. The display will read “0” and T1 will be stored as the reference value that the next mea- surement will be made relative to. • Touch the temperature probe sensor to the device under test (T2). • The 270 will display the differential temperature T2-T1. p h d s

Problem Probable Causes Does not power up • Dead or defective battery • Broken wire from battery snap to PCB Won’t display DC • Open fuse microamp readings • Open test lead • Improperly connected to circuit under test All functions except • Very weak battery that will ohms read high not turn on the low battery indicator on the LCD AC Volts do not read • Very weak battery that will not turn on the low battery indicator on the LCD Non-Contact Voltage • The non-contact voltage feature does not work works best when used to test a single wire. Make sure the arrow on the jaw is pointed at the wire. The meter beeps when • This is a reminder to remove the set on TEMP test leads and insert the temper- ature probe. If a probe is insert- ed, this is an indication the probe is open. AC Amps does not read • Make sure the jaw is clamped around a single wire and the device connected to the wire is turned on.

tery symbol when the internal 9 Volt battery needs replacement. If DC microamps does not operate correct- ly the 0.5A / 600V fuse needs to be replaced. The battery or fuse is replaced as follows: a. Disconnect and remove all test leads from live circuits and from the 270. b. Loosen the screw from the back of the 270 battery / fuse cover. c. Remove the battery / fuse compartment cover. d. Remove old battery or fuse and replace with new battery or fuse. Observe the correct polarity on the battery. Only install the correct value fuse (0.5A/600V). Failure to do so can result in instru- ment damage. e. Reassemble the instrument in reverse order from above. 2. Cleaning your 270: Use a mild detergent and slightly damp cloth to clean the surfaces of the 270. ature est a arrow e wire. ve the mper- nsert- e probe ped he re is

A009A Test Lead Set (1000V CATIII 10A) A085 0.5A / 600V Fuse A107 Soft Carrying Pouch A270 Optional Accessories Part Number Fused Test Lead Kit FTLK3 Deluxe Test Lead Set TLS2000RB Carbon Monoxide Adapter A771 Pressure Adapter A620

0.1ºF / 1ºF 270 SPECIFICATIONS (PARTIAL LIST) ±0.5% Basic DCV Accuracy (also see pages 8-11) Test Products International, Inc. 9615 SW Allen Blvd., Ste. 104 Beaverton, OR USA 97005 503-520-9197 • Fax: 503-520-1225 [email protected] L270M • 1/25/05 copyright © 2005 Test Products International, Inc.