Triplett 360PL Instruction Manual

Bluffton, Ohio

made a worthwhile investment, not only in a fine instrument, but backed up by a company which has been making instruments for more than hall a century. The Triplett Company stands behind your 630-PL and will give all possible assistance in its use and maintenance. TRIPLETT WARRANTY AND CONDITIONS OF SALE The Triplett Electrical Instrument Company warrants instruments manufactured by ii lo be free from defective material or factory workmanship and agrees to repair or replace such instruments which under normal use and service, disclose the defect lo be the fault of our manufacturing. Our obligation under this warranty is limited to repairing or replacing any instrument or test equipment which proves to be defective, when returned to us transportation prepaid, within ninety (90) days lrom the date of otiginal purchase. This warranty does not apply to any ol our products which have been repaired or altered by unauthorized persons or service stations in any way so as, in our judgment, to injure their stability or reliability or which have been subject to misuse, negligence or accident or which have had the serial number altered, effaced, or removed. Neither does this warranty apply to any of our products which have been connected, installed, or adjusted otherwise than in accordance with the instructions lumished by us. Accessories including all vacuum tubes and batteries not of our manulacture used with this product are not covered by this warranty. · The Triplett Electrical Instrument Company reserves the right to discontinue models al any time, or change specifications or design, w.ithout notice and without incurring any obligation. Upon acceptance of the material covered by this invoice the purchaser agrees to assume all liability for any damages and bodily injury which may result from the use or misuse of the material by the purchaser, his employees, or others, and that The Triplett Electrical Instrument Company shall incur no liability for direct or consequential damage of any kind. Parts will be made available for a maximum period of five (5) years after the manufacture of this equipment has been discontinued. Parts include all materials, charts, instructions, diagrams, accessories, et cetera, whic~ were furnished in the standard or special models. This warranty and conditicns of sale are in lieu of all others expressed or implied and no representative or person is authorized to assume for us any other liability in co-:.:1ection with the sale ol our products. The Triplett Electrical Instrument Company Bluffton, Ohio Printed in Part o. 84-89-011764-15 (For abov erial o. 29,500 and after April 30, 1963) TABLE OF CONTENTS 3 Page Familiarization . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......... • • • 4 Operation Measuring DC Volts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Measuring AC Volts ................. ........ .. ...... 8 Measuring DC Resistance ... ......................... 10 Measuring DC Current . .... . ...... ............... . ... 12 Measuring Output Volts (DB) ........................ 14 Operation Chart ............... . ... . ............. ... . 16 Measuring Capacity .......... .. ........ . .. ........ . .. 18 Additional Measurements Measuring Kilovolts ... . . ... .. ... ....... ... ...... ..... 20 Measuring High DC Current ....... ........... . ....... 21 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • • • • • 21 Additional Applications .... .. .......................... 22 Maintenance ...... . .... ..... .... .... .. ...... .. ... • • • • • 25 Interior View - Parts Location ................. .. .... ... 26 Replaceable Parts .... ... ........................... • • . 27 Circuit Diagram ..... ..... . ... .. .. ............. .... . • . • 28 Data DB Chart ........ ... ..... ..... ...................... 29 EIA Condenser Color Code .... . ... ...... .. ........... 30 EIA Resistor and Speaker Color Code .......... ...... . 31 EIA Wiring Color Code . ... .. ..... ... ...... . ... ... .... 31 EIA Transformer Color Code .. . ................. .. ... 32

long scale multi-range instrument in a compact portable case. Remove the test leads from the small envelope and notice the two alligator clips enclosed. The clips slide over the ends of the test prods and make very handy connectors. Plug the small ends of the test leads into the panel jacks marked COM and V-n-A. The jacks and plugs are espe- cially made for trouble-free, low resistance connections. Scales Notice there are five scales on the meter. The top scale (red) is used when measuring ohms. This scale is marked from 0 to lK (at left side). With the switch knob turned to nx 1, the ohms scale is read just as it is marked. With the switch knob turned to nX 10, the numbers on ohms scale must all be multiplied by 10. Likewise nx lK and OX lO0K mean to multiply by 1000 and 100,000 respectively. The second scale from the top (black) is used to read all DC currents and voltages. The third from the top (red) is used for all AC voltages except the 3 volt range-the latter is read on the bottom red scale (marked 3 at full scale). The lowest scale (black) is used for all decibel measure- men ts. Notice the chart near the lower right hand corner of the dial. This is used in conjunction with the DB scale as explained on page 14. P anel Just below the meter is a small plastic screw. This is rotated with a small coin or screw driver to adjust the meter pointer to zero. This need be adjusted only occasionally but for best accuracy the pointer should always be on zero before making a measurement. The large knob in the lower center of the panel is used to select aH ranges. The markings are self explanatory. Left of the knob is a recessed n ADJ control used when making resistance measurements. To the right of the knob is a recessed switch used for reversing polarity on DC ranges. Observe the jacks and note carefully the marking for 5 each. You will use the COM and V-n-A, jacks for most measurements. The polarity reversing switch must be in the "DC+, n, ACV" position !or all ohm and ACV measurements. P R O T E C T I O N: A one ampere {use Is incorporated in the ohm circuits for protectinq the ohm circuit when it is accidentally placed across high voltage. A spare fuse is attached to unit inside the tester. Accuracy Your 630-PL is accurate to within 3 % of full scale reading on all DC ranges except the 5000 volt range which 1s within 5 % , 4 % on all AC ranges except 5000 volts which is 5 % , and 3 % of the scale length on all resistance ranges. Precision, non-aging resistors insure lasting accuracy. All units are calibrated at 77° F. AC ranges are calibrated on a 60 cycle sine wave. In choosing ranges always endeavor to have the readings fall in the upper (or right hand) half of the scale for greatest accuracy. Ranges The following ranges are self contained in your 630-PL: DC Volts 2.5-10-50-250-1000-5000 at 20,000 Ohms AC Volts DC Microamperes DC Milliamperes DC Amperes Ohms Megohms Output Volts(AC) Decibels per Volt/ 0-.250 at 10,000 Ohms per volt 0-3-10-50-250-1000-5000 at 5,000 Ohms per Volt 0-100 at 250 Mv. 0-10-100-1000 at 250 Mv. 0-10 at 250 Mv. 0-1000-10,000 ..... ( 4.4-44 at center scale) 0-1-100 . . . . (4400-440,000 at center scale) 0-3-10-50-250-1000 at 5,000 Ohms per Volt -20 to + 11, 21, 35, 49, 61, 75 on 600 Ohm line Your 630-PL is well constructed but like any instrument should be handled carefully. You will also want to keep the panel clean as cleanliness and carefulness go hand in hand.

Rotate the selector switch to the appropriate range for DC volts. Always start with the highest range if in doubt as to the approximate voltage. In choosing ranges, endeavor to have the readings fall in the upper, or right hand, half of the scale for greatest accuracy. Plug the black test lead into the COM jack and the red lead into the V-n-A jack as shown in Figure 1. CAUTION: When measuring up to 5000 volts set the selector switch on the 5000/ 1000 range, plug the red lead into the jack marked 5000 DCV, and leave the black lead in COM. Connect the test prods ACROSS the voltage source. The red lead is positive. Where polarity is difficult to determine, the meter may read backwards. No damage will be done if this occurs. Simply reverse the polarity switch. The V-n-A jack will be positive when the polarity switch is in the "DC+ " position. Read all DC voltages on the top black meter scale. Notice that the scales are not all marked exactly the same as the range indicated by the knob position. Thus 0-2.5 volts is read on the 0-250 scale (i. e. + by 100) on all readings, the 0-1000 range is read on the 0-10 scale by adding two zeros, and the 0-5000 range is read on the 0-50 scale by adding two zeros. The high sensitivity of 20,000 ohms per volt will allow you to take measurements in low current circuits such as grid and discriminator circuits. Voltages as low as .005 volts, ( .250 volts full sc~e al 10,000 ohms per volt) may be read by using 100 uA DC current range. Simply place the range selector in the 100 uA position and read the voltage on the 0-250 scale (divide by 1000 for volts). CAUTION: For maximum safety do not handle tester or leads when connected to high voltages. Make certain that no condensers are charged to a high volta ge. NOTE: To measure above 1000 volts, the red lead must be plugged in o the 5000 DCV jack and selector switch set on the 5000/1000 DCV range. For handy operation chart see pages 16 and 17. 50 DC 0 5fc°v° ~ 0 ,i. A OUT Q PUT DC- COM- V-Il:A 0 Figure I - Measuring DC Volts 1

Rotate the Selector switch to the appropriate range for AC volts and set the polarity switch to ACV. Always start with the highest range if in doubt as to the approximate voltage. In choosing ranges, endeavor to have the readings fall in the upper, or right hand, half of the scale for greatest accuracy. Plug the black test lead into the COM jack and the red lead into the V-n-A jack as shown in Figure 2. CAUTION: When measuring up to 5000 volts set the selector switch on the 5000/1000 range, plug the red lead into the jack marked 5000 ACV, and leave the black lead in COM. Connect the test prods ACROSS the voltage source. As there is no polarity on AC, the red and black leads may be interchanged without causing the meter to read backwards. Use the two lower red scales for AC volt readings. Note that the bottom scale is to be used ONLY for one range, namely the 0-3. When using the 0-1000 AC volt range, read on the 0-10 scale by adding two zeros. When on the 5000 volt range use the 0-50 scale by adding two zeros. W i ih the special design of the two diodes in a modified full wave bridge circuit, the 630-PL gives a wide frequency response usable from 10 c p s to 500 Kc. CAUTION: For maximum safety do not handle tester or leads when connected to high voltages. NOTE: To measure above 1000 volts, red lead must be plugged into the 5000 ACV jack and the selector switch set on the 5000/1000 ACV range. For handy operation chart see pages 16 and 17. i~ 0 5fc°v° "f< 0 l'A OUT Q PUT =:JII Figure 2-Measuring AC Volts 9

Rotate the selector switch to the appropriate range for ohms determined from the following chart: To Read Set Switch to 0-100□- ohms ....... .. .. ... ........... nX 1 0-10,000 ............... .............. nx 10 0-1 Meg. . ................ .... ...... . nX lK 0-100 Meg ........................... nX l00K Set the polarity switch to n. Plug the black test lead into the COM jack and the red lead into the V-n-A jack as shown in Figure 3. Short the test prods together and adjust then ADJ knob until the meter pointer reads 0 on the top red (n) scale. (The 0 for the ohms scale is at the extreme right side of the scale.) Connect the test prods across the resistor as shown. If the resistor is wired in a circuit, disconnect one end of the resistor before taking the reading. Each time an ohm range is changed, it is well to check the 0 setting as outlined in paragraph 4 above. The basic scale 0-lK (0-1000) is used for reading on all ohm ranges. Simply multiply the scale numbers by 1, 10, 1000, or 100,000 as indicated by the selector switch setting. It should be kept in mind that in the measurement of resistance a current is passed through the unknown resistor. Generally this current is so small as to be negligible. How- ever on the 0-1000 range fairly high current is employed. CAUTION: On XI ohm position reading approximately center scale (4.4 ohms) the current drain from the J.S volt battery is 170 MA. It is desirable to make a practice of usinq one of the hiqher ohm ranges for general continuity or circuit testing. This will give you much longer battery life. NOTE: In the ohms circuit the battery polarity at the leads is as indicated. The red lead is positive. Since the scale of an ohmmeter is non-linear, the accuracy of the readinq cannot be expressed as a per cent of full scale. Ohmmeter accuracy is generally referred to a linear scale such as the DC volt scale. Thus ±3% ohmmeter accuracy means an allowable ± l.S divisions on the DC scale. For example 2 ohms could read from about 1.75 to 2.3 ohms and be within tolerance. NOTE: Do not touch any metal parts of the circuit when using the high ohm ranges. It is not dangerous but your body resistance can cause serious error. ,For handy operation chart see pages 16 and 17. 500 DC 0 5000 ~ ~V *A 0 A UNKNOWN RESISTOR OUT Q PUT Figure 3-Measuring DC Resistance 11

Rotate the selector switch to the appropriate range for DC current. Always start with the highest range if in doubt as to the approximate current. In choosing ranges, endeavor to have the readings fall in the upper, or right hand, half of the scale for greatesi accuracy. Plug the black test lead into the COM jack and the red lead into the V-0-A jack as shown in Figure 4. Connect the test prods in SERIES with the circuit to be measured. Do not test directly across any potential circuits as this may burn out the instrument and shunt. The red lead is positive. Where polarity is difficult to determine, the meter may read backwards. No damage will be done if this occurs. Simply reverse the polarity switch. Read all current ranges (including microamperes, mil- liamperes, and amperes) on the upper black scale. When on the 10 Ma. range use the 0-10 scale and read direct. On the 100 Ma. range again use the 0-10 scale by adding one zero. CAUTION: Turn off the power before connecting the meter to the circuit. Do not handle tester or leads in high voltage circuits. In using the 100 microampere range, the meter may read differently than calculations would indicate. This is some- times caused in low current circuits by a slight leakage of voltage due to moisture. Other times a slight potential is generated by soldering or joining of dissimilar metals. Even the proximity of fumes or liquid acids and alkalies may react with the metal parts of the circuit and generate slight cur- rents. The fingers should not be permitted to touch the metal parts of the prods or circuit as body resistance can also up- set some circuits. For handy operation chart see pages 16 and 17. 500 DC 0 5000 "!( ACV 0 p.A OUT Q PUT OPEN CIRCUIT RED Figure 4- Measuring DC Current 13

Output is generally measured in units called the decibel, a terminology used to indicate power levels in amplifiers or telephone work. Do not confuse the DB with the VU (Volume Unit). The VU is based on .001 watt dissipated in a 600 ohm line and is measured with a meter having special ballistic charac- teristics. Rotate the selector switch to the appropriate AC volt range and set the polarity switch to ACV. Refer to the small chart on the meter dial for the range to use. Always start with the highest range if in doubt as to the approximate number of decibels. Normally it is recommended to measure output by plug- ging the black lead into the COM jack and the red lead into the OUTPUT jack as shown in Figure 5. Oftentimes a DC voltage is present in the circuit where output is to be measured. The extra jack marked OUTPUT with a .1 mfd condenser in series is provided to block the DC. The condenser impedance is generally disregarded in most measurements. Where no DC is present, this output voltage can be read accurately by using the 630-PL as a regular AC voltmeter (i. e. by plugging the red lead into the V-n-A jack instead of OUTPUT.) Connect the test prods across the plate circuit or speaker voice coil. Read all DB ranges on the bottom black scale using the small chart on the meter dial. For example, when the selector switch is set on the 3 AC volt range, the DB scale is direct reading. When on the 10 AC volt range, add 10 to reading on the DB scale, thus with the meter reading -2, the ap- proximate DB reading is + 8 DB. For a reference level of .006 watt in 500 ohms, subtract ( + )7 DB from the reading to obtain the absolute value of decibels. For handy operation chart see pages 16 and 17. 500 DC 0 5000 :1 ACV •A-A 0 Jl.A OUT Q PUT 600 OHM LINE When using the 5000 AC voltage range for output measurements ii i1 necesaary to ::>lace a condenser capable of withstandini this high voltage extemal to the tuter and connected in series to the 5000 AC volt fack mung the COM lack to complete the circuit. This e'ICtemal condenser is not a furnished part of the equipment. Figure 5-Measuring Output Volts (DB) 15

DC 0-10 AMPS DC OHMS 0-1000 0- 10,000 0- 1 Meg 0-100 Meg DECIBELS -20 to +11 -10 to +21 + 4 to +35 +18 to +49 +30 to +61 +44 to +1s OPERATION CHART Set Switch To Selector Polarity Plug Red* Test Lead In Jack Marked Read On Each Scale Div. Equals 100 p.A 2.5 DCV 10 DCV 50 DCV 250 DCV 1000/5000 DCV 1000/5000 DCV 3 ACV 10 ACV 50 ACV 250 ACV 1000/5000 ACV 1000/ 5000 ACV 100 µ.a 10 DCMA 100 DCMA 1000 DCMA 10 AMP nxl nXlO nXIK nXlO0K 3 ACV 10 ACV 50 ACV 250 ACV 1000/5000 ACV 1000/5000 ACV either either either either either either either V-n-A V-n-A V-n-A V-n-A V-n-A V-n-A 5000 DCV BLACK SCALE 0-250 DC---;-1000 0-250 DC---;-100 0- 10 DCXI 0-50 DCXl 0-250 DCXl 0- 10 DCXlO0 0-50 DCXlO0 0.005 0.05 0.2 1.0 5.0 20.0 100.0 Volt Volt Volt Volt Volts Volts Volts - - - ------- ---------1-------- ACV ACV ACV ACV ACV ACV either either either either either n n n n ACV ACV ACV ACV ACV ACV V-l-A V-p-A V,h-A V-n-A V-n-A 5000 ACV V-n-A V-n-A V-n-A V-n-A V-n-A V-n-A V-n-A V-n-A V-n-A t O4tput O11Jput Output Output Output 5000 ACV RED SCALE 0-3V ACXl 0- 10 ACXl 0-50 ACXl 0- 250 ACXl 0- 10 ACXlO0 0-50 ACXlO0 BLACK SCALE 0-10 DCXlO 0- 10 DCXl 0- 10 DCXlO 0-10 DCXlO0 0- 10 DCXl 0.05 0.2 1.0 5.0 20.0 100.00 2.0 0.2 2.0 20.0 0.2 Volt Volt Volt Volts Volts Volts µ.a Ma Ma Ma Amp Each Scale Division Equals (in ohms} RED SCALE I 0-4 I 4-5 I 5-10 I 10-20 I ?.0-50 I 50-200 OX ! OXIO j . I I .2 I .5 I 1 I 5 I ~- I 1 I 2 I s I 10 I so I soo I 100 I 200 I 500 I lK I SK I SOK OXIK OXIOOK I lOK I 20K I SOK I IOOK I SOOK I SMea BLACK SCALE DB plus 0 DB plus 10 DB plus 24 DB plus 38 DB plus 50 DB plus 64 * Black test lead plugged in "COM" jack for all measurements 17

Your 630-PL can be used to measure capacity by the arrangement shown in Figure 6. It is set up as an AC volt- meter. See page 8. Use the following chart to determine the AC voltage range to use. ALWAYS start with the selector switch on the 250 volt range since, if the condenser is shorted, serious damage may result to the meter when on a low range. To Measure MFD .0021 .004 I .006 ~ .oos I .010 J Set Selector Switch to 3 ACV Deflection in AC Volts f .45 I .83 ~ 1.25 I 1.65 t 2.10 CAUTION: Do not attempt to use this test on electrolytic condensers. 500 DC X 0 5000 ':"( ACY V·Il:A 0 /lA OUT Q PUT IIOV 60~ UNKNOWN CAPACITOR .5MFD Figure 6-Measuring Capacity 19

applications, an external probe is available. See Figure 7. Probes for DC are made in three ranges 0-10,000, 0-25,000, and 0-50,000 volts. Probes for AC are also available in the lower ranges. To use the Kilovolt probe set range selector switch on 2.5 volt DC position if the DC probe is to be used. When the AC probe is used set range selector switch on 3 Volt AC position and set the polarity switch to ACY. Pluq the Kilovolt probe lead into the V-0-A jack on bottom riqht comer of the front panel. Use the black standard lead for negative or common lead with it connected in the COM jack located on the lower right side of front panel. Kilovolt Set Selec- Probe tor Switch 0-IOKV DC 2.5V DC 0-25KV DC 2.5V DC 0-50KV DC 2.5V DC 0-IOKV AC 3V AC 0-25KV AC 3V AC Figure 7 Read on Range 0-IOV DC 0-250V DC 0-50V DC 0-IOV AC 0-250V AC Multiply by 1000 100 1000 1000 100 USE EXTREME CAUTION in measuring the high voltages such as found in television receivers. Clip the common lead to the circuit so you will have only one probe in your hand. 21 Measuring High DC Current External plug-in shunts are available to extend the DC current ranges of your 630-PL from the self-contained 0-10 to 0-25 amps. External portable shunts up to 100 amperes are also available. (See paragraph on accessories.) Set the 630-PL selector switch to the 10 Ma. position and plug the desired external shunt into the COM and V-n-A jacks. Connect the line to be measured to the binding posts on top of the shunts. The external portable shunts are too large to plug into the panel and must be connected to the panel jacks by the leads furnished with the shunts. Accessories The following accessories for your 630-PL are available from your distributor. Item DC Hi-Voltage probe 0-10 Kv AC Hi-Voltage probe 0-10 Kv DC Hi-Voltage probe 0-25 Kv AC Hi-Voltage probe 0-25-Kv DC Hi-Voltage probe 0-50 Kv Carrying cases 639, 639-N and 639-P Plug-in external shunt 0-25 DC Amp. Portable external shunt 0-50 DC Amp. Portable external shunt 0-100 DC Amp. Clamp-on Ammeter Adapter, Model 10 (Ranges 6 to 300 AC Amps) Lead Assembly, No. 611 (Used in conjunction with Model 10) Line Separator, Model 101 (Used in conjunction with Model 10) Part No. T-79-83 79-165 T-79-130 79-166 T-79-92 T-91-243 T-91-244 T-91-191 60A-211 79A-160 60A-218

When your refrigerator motor fails to "kick out" the starting winding, use the 630-PL, to measure the AC line voltage. If the voltage is below about 100 volts, notify your power company. If your electric stove does not seem to heat quickly enough, measure the voltage input to the stove with all burners turned on and again with all burners turned off. If the difference between these two voltages is 10 or 15 volts, the power cable to the stove has defective connections or is not of large enough current carrying capacity. Blown fuses sometimes do not visibly indicate they are burned out. With your 630-PL measure the voltage ahead and behind the fuse. Voltage ahead of the fuse but no voltage following indicates a blown, defective, or loose fuse. Sometimes it is easier to remove the fuse and measure its resistance. This should be substantially zero. Your 630-PL is handy for locating trouble in desk and floor lamps. Pull the plug from the wall socket and check for a faulty cord, plug, switch, socket, or bulb by measuring resistance on the n X 1 range. 100 watt 120 volt bulbs should read 10 to 20 ohms. 50 watt 120 volt bulbs should read 20 to 40 ohms. For the Radio Man In addition to all common voltage, current, and resist- ance measurements used in servicing radios, the high sensi- tivity of your 630-PL is well adapted to measuring AFC, A VC, bias, and FM discriminator voltages. Measurements of the high voltage up to 27,000 volts D. C. used in some television receivers for the picture tube can be effected with the special high voltage probe shown on page 20. Considerable trouble is had with leakage in automobile radio antennas (due to moisture). Your 630-PL with the h~gh ohm range 0-100 meg. is ideal to check this leakage. Disconnect the antenna from the receiver before making this check. High frequency measurements are possible since the 23 630-PL has a wide frequency response-usable from 10 cps to 500 Kc. In The Industrial Plant Your 630-PL will be a big help in checking voltage drop caused by adding that extra machine on the already overloaded line. Correcting this will often save time later when a rush comes and the line "just happens" to burn up. Measure the voltage at the machine first with the ma- chine turned off and again with the machine in operation. If the voltage is proper with the machine off but low with the machine in operation, the circuit wiring or transformers have too small a capacity. If the voltage is low even with the machine off, the circuit is probably already overloaded and the machine should be wired into another circuit. Equipment using automatic electric controls can be checked with the 630-PL. Faulty relay or control action is often caused by low voltage applied to the relay or control. This low voltage in turn, may be caused by burned or dirty contacts on the control device. Use the nX 1 range to check for high or unstable contact resistance. When a phone on your dial telephone system fails, measure the line current and the voltage to the particular relay in question. If the voltage is proper, measure the con- tact resistance of the relay contacts using the nX 1 scale on your 630-PL. If this resistance is over a fraction of an ohm or if the resistance seems to waver, clean and adjust the relay contacts. In The Garage Fuses in the automobiles have a tendency to look per- fectly good and yet not function due to corrosion under the metal end cap. Measure voltage ahead and behind the fuse to determine a defective unit. Or remove the fuse and measure its resistance. Anything over a fraction of an ohm is too high. . Checking automobile wiring, light switches, heaters, radios, etc., can be speeded up by simple use of your 630-PL.

Your 630-PL is built with all prec1s1on, non-aging resistors. The specially designed switch and special banana type plugs insure lasting accuracy. The meter with specially finished and selected pivots and jewels and a well designed stable magnet further makes the 630-PL a must for the laboratory. Special Applications The unusually high range ohmmeter in your 630-PL permits some indication of condenser leakage resistance. Measure as a resistor, see page 10, using the highest range. A good paper or mica condenser under 1 mfd. will indicate at the 100 Meg mark or above. If a steady reading (taken after the initial surge required to charge the condenser) of less than 100 megohms is obtained, the condenser probably has defective insulation. Good paper condensers over 1 mfd. may read somewhat less than 100 megohms. Electrolytic condensers should read above .1 megohm. In checking electrolytic condensers, the black test lead ("com" jack) should be connected to the positive terminal of the condenser. Checks of insulation resistance for motors, generators, telephone cables, power cables, etc., can be made on the high ohmmeter range of your 630-PL. The actual value of resistance may vary from a few megohms to over 100 meg, depending on weather conditions and quality of insulation. The best method, therefore, is to make periodic checks on important cables or equipment and observe the trend in readings. As the readings tend to be lower and lower, it is time to start drying out the equipment or determine the cause of deterioration. Dirt, mice, or foreign matter can sometimes cause excessive leakage. MAINTENANCE 25 :Battery Replacement Two batteries are used for the ohmmeter circuits, a 1.5 volt Eveready No. 950 or equivalent and a 30 volt Eveready No. 413 or equivalent. When the meter pointer can no longer be adjusted to zero (see page 10)' ohms on the nx 1, nx 10, or nx 1000 ranges, replace the 1.5 volt battery. When the meter pointer can no longer be adjusted to zero ohms on the nx 100,000 range, replace the 30 volt battery. To replace batteries, remove the four screws in the bot- tom of the case and lift panel from the case. Simply remove the old, and replace with a new battery being careful to observe polarity. Care A little precaution in handling and caring for your 630-PL can pay big dividends in satisfaction. Treat your tester like you would a fine watch. Avoid placing your tester on a bench where machine tools are used or severe vibration is encountered. Do not place your 630-PL near the edge of a shelf or bench where it can easily be knocked off. When possible keep your 630-PL in a place of moder- ate temperatures. A void places with extreme temperatures or severe temperature changes. In .ise, don't take chances on overloading the meter. If in doubt as to the approximate reading always start with the highest range. Get in the habit of double checking the position of the switch before making a measurement. The meter can be burned out by applying voltage when the switch is set on the current or ohms scale. If the unit has not been in use for a long period of time, rotating the switch in both directions several times will wipe the contacts clean for good contact. Turn the selector switch to OFF when the unit is to be carried. The meter is damped in this position to prevent wild swinging of the pointer.

R9 10 DC MA. RS 100 DC MA. R7 1000 DC MA. X AC RECTIFIER ASSEM. R5 R6 REdTIFIER CIRCUIT R4 10 ACV R3 50 ACV R2 250 ACV RI 1000 ACV R3O 5000 DCV Ref. No. Rl R2 R3 R4 R6, R6 R7 R8 R9 Rll RlO R12 R13 R14 R16 R16 R17 R18 R19 R20 R21 R22} R23 f R27 R28 R29 R30 R31 C B2 Bl M X Sl s2 Fl REPLACEABLE PARTS 630-PL 27 DESCRIPTION Part No. Req, Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resigtor Resistor Resistor Resistor 3.75 Meg., 1 Meg., 200K, 35K, 6K, .25 ohms, 2.5 ohms, 25.12 ohms 423K, 5K, 13.6K, 4690 37.2, 3.7 ohms, 732, 6.5 ohms, 45K, 150K, SOOK, 4 Meg., 7.5 Meg., ±1%, 1hW, film type T-15-2842 ±1%, ½W, film type T-15-1358 ±1%, ½W, film type T-15-1061 ±1%, ½W, film type T-15-2843 ±1%, ½W, film type T-15-1009 ±1 %, Wire type T-16-1528 ±1 %, Wire type T-15-1976 ± 1 % Wire type 15-2850 ±1%, ½W, film type T-16-4120 ±1 %, ½ W, film type T-16-1009 ± 1 %, film type T-15-1768 ± 1%, ½W, film type 15-4118 ± 1%, ½W, film type T-15-4116 ±1%, Wire type T-15-3223 ± 1 %, ½ W, film type T-15-4119 ±1 %, Wire type T-15-4117 ±1 %, ½ W, film type T-15-1060 ± 1 %, ½ W, film type T-15-1763 ±1%, ½W, film type T-15-1137 ±1%, 1hW film type T-16-1138 ±1 %, ½ W, film type T-15-1262 Resistor 20K, ±20%, Variable 16-31 (with mtg. nuts & knob) Shunt Assem. 10 Amp Resistor 20 Meg., Resistor 60 Meg., Resistor 5100, Capacitor .1 mfd., 400WV ±1%, 2W ±1%, 2W ±5%, ½W Battery 1.5 Burgess No. 2, NEDA No. 13 Battery 30V, Burgess, U20E, Eveready 413, or NEDA No. 210 Meter 60 Micro-Amps, 250 Millivolts Rectifier assembly Switch 20 Pos., 3 deck, without resistors Switch 20 pos., 3 deck, with resistors Switch Slide, DPDT (Wirt SW726) Knob Scarlet, 2 5/16 long with clip Case with handle Jack contact Clip shunt retainin_g- No. C2416-012-27 Bumper rubber Leads Banana Type Front Clear plastic with zero adj. Fuse 1 Amp. Littlefuse, 3AG, 312001 90A-449 15-1674 15-2844 15-1411 T-43-69 f Available } Locally 52-1294 2250A 30 22A 319 22-320 T-22-152 34 B-62 T-10-784 8944 T-2451-6 T-3236-10 T-79-127 T-10-1225 3207-15

1121 DC 5000 AC V-A-A COM 11000 1000 250 110 10 2.11 XI XIO )CIK XIOOK D C V 0 M M s 100 ) ~ 100 ~ ,o l 1000 10 ) A 0 3 0 10 0 50 o 2110 0 1000 11000 0,, A C V RESISTORS R58R6 ARE PART OF RECTIFIER CIRCUIT BUT MOUNTED ON SWITCH Figure 8-Circuit Diagram DATA 29 DB CHART 0 DB at 1 Mw RMS Volts with Decibels with Line Power line Imped. of 500 ohm line Mw 600 ohms -20 .01 .0775 -10 .l .245 -5 .316 .436 0 1.00 .775 +10 10.0 2.45 + 15 31.6 4.36 + 20 100 7.75 + 30 1000 24.5 + 40 10,000 7'1.5 + so 100,000 245. + 60 1,000,000 775. + 70 10,000,000 2450 Note: The range of audibility can be considered to lie from 70 db below the normal speech level to 70 db above the same level, or a total range of 140 db.

MOLDED PAPER MOLDED MICA CERAMIC Color Multiplier Tolerance Multiplier Tolerance Multipler Tolerance Black I 20% I 20% l 20% or 2.0µµfd . • Brown 10 10 10 l o/c Red 100 100 20% EIA 100 2i Orange 1000 1000 3% EIA 1000 2. % EIA Yellow 10,000 5% 10,000 10,000 or 0.5µµfd .• Green 5% EIA 5% Blue Violet 0.01 0.25µµld .• Gray 1001, 0.1 10% or l.0µµfd . • White Gold 0.1 0.1 Silver So/co 10% 0.01 5% (JAN) 10% • Capacitance None 20% less than lOµµfd . MOLDED PAPER MOLDED MICA CE"RAMIC TUBULAR .!!!!!.!.. .!.£Q!. ~ 6 COLOR RAOIAL LCAO @aonoe 0 ,1~11 ~I r ~ 8LACK A B -mJ} l JABCO .aecD EF 0 5 COLOR ~AOIAL LEAO FLAT JAlf TYPE G D C G D C @aaoa 0 ~ SUTTON SILVER MICA ~- H ABC D G e 5 COLOR AXIAL LEAD 0 -m~n~ ~ G O C C 3•dOIGIT FLAT COM1L. TYPES OBSOLETE RMA SYSTEMS HA II CO 5 COLOR STANO-OFF BLACK BODY E A B 3rd0tGIT ~ ~ ~ 6rfm} AB C DOT o o O iW ABC H4 8 CD E O C . ~ SCOLOR 3 COLOR A 8 C 4w 0 DISC DISC [ DOT~ SLANI( FRONT "~ 8 -{coo9>~] A 8 C ED REAR 'O' o~~ ~ -B- E 0 A 8 C 0 A 8 C A BC, (Courtesy Popular Electronics) Ca}Xlcitance is given in µµId . Colors-$ame value as on resistors except as indicated in tables. COLORS INDICATES A Brat iligit B Second digit C Multiplier D Tolerance E & F Voltage Rating in hundreds of volts ( (E) Rati!}gs less than 1000 volts. (E) & (F) Firat two digits of ratings lCXXJ volts or more. Values of colors for (E) & (F) are same as in resistance values. (q) ii class or characteristics of caJXJcitor. (H). (I) & (J) give temperature coefficient. (G), (H). (I) & (J) are not listed in the tables.] Color Black Brown Red Oranqe Yellow 3reen Blue Example: DATA 31 EIA RESISTOR COLOR CODE A 8 C 0 Color A B C D Number 0 I 2 3 4 5 6 8 A C Indicates First number Second number Number of zeros Tolerance Color Violet Gray White Gold Silver None Number 7 8 9 5°1,, tolerance 10°1,, tolerance 20°/,, tolerance The resu)tinq value is in ohms. A 250,000 ohm 200/n resistor. A red B green C yellow D no color EIA SPEAKER COLOR CODE Voic- Coil: Gr;,en-finish Black-start Field Coils: Black and red-start Yellow and red-finish Slate and red-tap (if any) EIA WIRING COLOR CODE B+ Ground Plate Grid Cathode High Heater Low Heater Screen Grid AVC Red Black Blue Green Yellow Brown - Black Orange White

I. F. Transformers: Blue- plate lead Red-"B" + lead Green-grid (or diode) lead Black- grid (or diode) return NOTE: If the secondary of the i. f. t. is center-tapped, the second diode plate lead is green-and-black striped, and black is used for the center-tap lead. Power Transformers: 1. Primary Leads .... Black If tapped: Common .... . .... Black Tap-Black and Yellow Striped Finish-Black and Red Striped 2. High-Voltage Plate Wind- ing . ............... Red Center-Tap - Red and Yellow Striped 3. Rectifier Fil. Winding ... Yellow Center-Tap-Yellow and Blue Striped 4. Fil. Winding No.I. Green Center-Tap - Green and Yellow Striped 5. Fil. Winding No. 2. Brown Center-Tap- Brown and Yellow Striped 6. Fil. Winding No. 3. Slate Center-Tap - Slate are Yellow Striped A. F. Transformers: Blue-plate (finish) lead of primary Red-"B" + lead (this ap- plies whether the primary is plain or center-tapped). Brown- plate (start) lead on center tapped primaries (Blue may be used for this lead if polarity is not important.) Green- grid (finish) lead to secondary Black-grid return ( this ap- plies whether the second- ary is plain or center- tapped.) Yellow-grid (start) lead on center tapped second- aries. ( Green may be used for this lead if polarity is not important.) Note: These marking ap- ply also to line-to-grid, and tube-to-line transformers.