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*TB 9-6625-1957-35
SUPERSEDED COPY DATED 18 JULY 1988 DEPARTMENT OF THE ARMY TECHNICAL BULLETIN CALIBRATION PROCEDURE FOR DIGITAL MULTIMETER, TEKTRONIX TYPES DM 501 AND DM 501A WITH DC HIGH VOLTAGE PROBE, BALLANTINE, MODEL 10800C; JOHN FLUKE, MODEL 80K-40;AND TEKTRONIX, TYPE 010-0277-00
Headquarters, Department of the Army, Washington, DC 22 February 1993
Approved for public release; distribution is unlimited REPORTING OF ERRORS You can help improve this publication by calling attention to errors and by recommending improvements and stating your reasons for the recommendations. Your letter or DA Form 2028, Recommended Changes to Publications, should be mailed directly to Commander, U.S. Army Aviation and Missile Command, ATTN: AMSAM-TMD-EP, Redstone Arsenal, AL 35898-5000. FAX to DSN 788-2313 (commercial 205-842-2313). A reply will be furnished directly to you. Paragraph SECTION I. IDENTIFICATION AND DESCRIPTION Test instrument identification ............................ Forms, records, and reports ................................ Calibration description........................................ EQUIPMENT REQUIREMENTS Equipment required ............................................ Accessories required............................................ CALIBRATION PROCESS FOR DIGITAL MULTIMETER, TEKTRONIX, TYPE DM 501 Preliminary instructions ..................................... Equipment setup ................................................. Dc voltage ............................................................ Resistance............................................................ Dc current............................................................ Ac voltage ............................................................ Power supply ....................................................... Final procedure ................................................... 1 2 3 4 5 Page 2 2 3 4 4

SECTION

II.

III.

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__________ *This bulletin supersedes TB 9-6625-1957-35, dated 18 July 1988, including all changes.

TB 9-6625-1957-35
Paragraph SECTION IV. CALIBRATION PROCESS FOR DIGITAL MULTIMETER, TEKTRONIX, TYPE DM 501A Preliminary instructions ................................... Equipment setup Dc voltage .......................................................... Ac voltage .......................................................... Ac dBm/dBV ...................................................... Dc current.......................................................... Resistance.......................................................... Final procedure ................................................. V CALIBRATION PROCESS FOR DC HIGH VOLTAGE PROBE, BALLANTINE, MODEL 10800C, JOHN FLUKE, MODEL 80K-40, AND TEKTRONIX, TYPE 010-0277-00 Preliminary instructions ..................................... Equipment setup ............................................... Dc probe check................................................... Final procedure ................................................. 14 15 16 17 18 19 20 21 10 10 11 12 13 14 14 15 Page

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SECTION I IDENTIFICATION AND DESCRIPTION 1. Test Instrument Identification. This bulletin provides instructions for the calibration of Digital Multimeter, Tektronix, Types DM 501 and DM 501A with DC High Voltage Probe, Ballantine, Model 10800C; John Fluke, Model 80K-40; and Tektronix, Type 010-0277-00. The manufacturer's manuals were used as the prime data sources in compiling these instructions. The equipment being calibrated will be referred to as the TI (test instrument) throughout this bulletin. a. Model Variations. The John Fluke, Model 80K-40 is the same as the Tektronix, Type 010-0277-00 probe and is nonadjustable. b. Time and Technique. The time required for this calibration is approximately 1.5 hours, using the dc and low frequency technique. 2. Forms, Records, and Reports a. Forms, records, and reports required for calibration personnel at all levels are prescribed by TB 750-25. b. Adjustments to be reported are designated (R) at the end of the sentence in which they appear. When adjustments are in tables, the (R) follows the designated adjustment. Report only those adjustments made and designated with (R). 2

TB 9-6625-1957-35 3. Calibration Description. TI parameters and performance specifications which pertain to this calibration are listed in table 1.
Test instrument parameters Dc voltage Dc current Resistance Table 1. Calibration Description Performance specifications Tektronix, Type DM 501 Range: 0 to 1000 V (in 4 ranges) Accuracy: ą(0.1% of reading + 2 digits) Range: 0 to 2000 mA (in 4 ranges) Accuracy: ą(0.2% . of reading + 10 digits) Range: 0 to 20 M (in 5 ranges) Accuracy: ą(% of reading + digits) Range: 2 k through 2.0 M ............ 0.3 + 2 20 M 0.5 + 2 Range: 0 to 500 V ( in 4 ranges) Frequency: 20 Hz to 20 kHz Accuracy: ą(% of reading + digits) Range: 20 to 40 Hz ............................ 1.2 + 2 40 Hz to 10 kHz..................... 0.7 + 2 10 to 20 kHz .......................... 1.2 + 2 Tektronix, Type DM 501A Range: 0 to 1000 V ( in 5 ranges) Accuracy: ą(% of reading + % of FS) Range: 200 mV .05 + .015 2, 20, and 200 V..................... .05 + .01 1000 V .05 + .02 Range: 0 to 500 V (in 5 ranges) Frequency: 20 Hz to 20 kHz Accuracy: ą(% of reading + % of FS) 200 mV through 200 V ranges: 20 to 40 Hz ............................ 1.0 + .05 40 Hz to 10 kHz..................... 0.6 + .05 10 to 20 kHz .......................... 1.0 + .05 500 V range: 20 to 40 Hz ............................ 1.0 + 0.2 40 Hz to 10 kHz..................... 0.6 + 0.2 10 to 20 kHz .......................... 1.0 + 0.2 Range: -40 to +40 dB (in 5 ranges) Frequency: 20 Hz to 10 kHz Accuracy: ą(dB)1 +20 to -15 dB: 20 Hz to 20 kHz.................. 0.5 -15 to -20 dB: 20 Hz to 2.0 kHz................. 0.5 2.0 to 10 kHz ...................... 1.5

Ac voltage

Dc voltage

Ac voltage

Ac dBm/dBV

See footnote at end of table.

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TB 9-6625-1957-35
Table 1. Calibration Description - Continued Test instrument parameters Performance specifications Tektronix, Type DM 501A - Continued Resistance Range: 0 to 20 M (in 5 ranges) Accuracy: ą(% of reading + % of FS) Range: 200 through 200 k (LO) ................... 0.15 + .015 2 k through 2000 k (HI)................... 0.15 + .015 2000 k (LO) ........................................ 0.3 + .015 20 M (HI) .......................................... 0.5 + .015 Dc current Range: 0 to 2000 mA (in 5 ranges) Accuracy: ą(0.2% of reading + .015% of FS) Dc High Voltage Probes (All Models) Dc voltage Range: 1 to 40 kV2 Accuracy: 4.00% at 1 and 40 kV 3.0% at 10 kV 2.0% at 20 and 30 kV ą1.0% at 25
1Accuracy applies to TI display value. To obtain correct dB reading, algebraically add the range selected to the display reading. Dynamic range is -60 to +56.2 dBrn. 2Verified at 1000 V only.

SECTION II EQUIPMENT REQUIREMENTS 4. Equipment Required. Table 2 identifies the specific equipment to be used in this calibration procedure. This equipment is issued with Secondary Transfer Calibration Standards Set AN/GSM-286. Alternate items may be used by the calibrating activity. The items selected must be verified to perform satisfactorily prior to use and must bear evidence of current calibration. The equipment must meet or exceed the minimum use specifications listed in table 2. The accuracies listed in table 2 provide a four-to-one ratio between the standard and TI. 5. Accessories Required. The accessories required for this calibration are common usage accessories, issued as indicated in paragraph 4 above, and are not listed in this calibration procedure.
Table 2. Minimum Specifications of Equipment Required Manufacturer and model Minimum use specifications (part number) Dc voltage: John Fluke, Model 5700A/CT (p/o Range: .19 to 1000 V MIS-35947); w/power amplifier Accuracy: ą0.14% John Fluke, Model 5215A/CT Ac voltage: (5215A/CT); w/transconductance Range: 100 mV to 500 V amplifier, John Fluke, Model Frequency: 20 Hz to 20 kHz 5220A/CT (5220A/CT); w/ac divider, John Fluke, Model 7405AAccuracy: ą(%) 4207 (7405A-4207) 1.0 to 10 kHz ...................... 0.16 20 Hz and 20 kHz ............... 0.26

Common name CALIBRATOR

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TB 9-6625-1957-35
Table 2. Minimum Specifications of Equipment Required - Continued Manufacturer and model Common name Minimum use specifications (part number) John Fluke, Model 5700A/CT (p/o CALIBRATOR (cont) Resistance: MIS-35947); w/power amplifier Range: 190 to 19 M John Fluke, Model 5215A/CT Accuracy: ą(%) (5215A/CT); w/transconductance Resistance: amplifier, John Fluke, Model 190 through 1.9 M................. 0.04 5220A/CT (5220A/CT); w/ac 0.3 dividier, John Fluke, Model dBm (6000 reference) (Type DM501A only) 7405A-4207 (7405A-4207) Range: -20 to +45 dBm Frequency: 20 Hz to 20 kHz Accuracy: 0.125 dBm (l.4%) Dc current: Range: 190 ľA to 1.9 A Accuracy: ą0.054%

SECTION III CALIBRATION PROCESS FOR DIGITAL MULTIMETER TEKTRONIX, TYPE DM 501 6. Preliminary Instructions a. The instructions outlined in paragraphs 6 and 7 are preparatory to the calibration process. Personnel should become familiar with the entire bulletin before beginning the calibration. b. Items of equipment used in this procedure are referenced within the text by common name as listed in table 2. c. Unless otherwise specified, verify the result of each test and, whenever the test requirement is not met, take corrective action before continuing with the calibration. Adjustments required to calibrate the TI are included in this bulletin. Additional maintenance information is contained in the manufacturer's manuals for this TI. d. When indications specified in paragraphs 8 through 11 are not within tolerance, perform power supply check prior to making adjustments. After adjustments are made, repeat paragraphs 8 through 11. Do not perform power supply check if all other parameters are within tolerance. e. Unless otherwise specified, all controls and control settings refer to the TI.

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TB 9-6625-1957-35 7. Equipment Setup WARNING HIGH VOLTAGE is used or exposed during the performance of this calibration. DEATH ON CONTACT may result if personnel fail to observe safety precautions. REDUCE OUTPUT(S) to minimum after each step within the performance check where applicable. a. Remove TI protective cover from TI only to make adjustments and replace upon completion. b. Connect T1 to power module using an extender. Connect power module to a 115 V ac source. Pull power module PWR switch to ON and allow at least 30 minutes for stabilization. 8. Dc Voltage a. Performance Check (1) Set RANGE/FUNCTION switch to 2 DC VOLTS and set INPUT INT to OUT: EXT (out). (2) Short INPUT HI and LO terminals. If TI does not indicate .0000, perform b below. (3) Remove short and connect calibrator OUTPUT terminals to TI INPUT HI and LO terminals. (4) Set TI RANGE/FUNCTION switch and set calibrator output as specified in table 3. If TI does not indicate within the specified limits, perform corresponding adjustment procedure.
Table 3. Dc Voltage Test instrument RANGE/FUNCTION switch (DC VOLTS) 2 2 2 20 200 1 k Calibrator Test instrument output indications (V) Min Max 1.8 1.7980 1.8020 -1.8 -1.7980 -1.8020 .5555 .5548 .5562 18 17.980 18.020 180 179.80 180.20 900 898.9 901.1 SET CALIBRATOR OUTPUT TO MINIMUM Adjustments (fig. 1) (R) R182+DC CAL R202 - DC CAL

b. Adjustments. zeros. 6

Adjust R155 INTEGRATOR ZERO (fig. 1) until TI indicates all

TB 9-6625-1957-35

Figure 1. Tektronix, Type DM 501 - left side view.

9. Resistance a. Performance Check (1) Connect calibrator OUTPUT to TI INPUT HI and LO terminals. (2) Set RANGE/FUNCTION switch to 200K OHMS. (3) Set calibrator for a 190 k output. Adjust calibrator's output adjustment control for a calibrator control display reading equal to the TI's indication. The calibrator's control display ERROR indication will be ą0.31 percent; if not, perform b below. (4) Repeat technique of (2) and (3) above using values listed in table 4. Calibrator's ERROR display will be within the limits specified. b. Adjustments. Adjust R35 CAL (fig. 1) for a T1 indication equal to calibrator's displayed value for 190 k (R).

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TB 9-6625-1957-35
Test instrument RANGE/FUNCTION switch settings 2 k 20 k 2 M 20 M Table 4. Resistance Calibrator Output nominal ERROR display resistance values indications ą(%) .31 1.9 k .31 19 k .31 1.9 M .51 19 M

10. Dc Current a. Performance Check (1) Connect calibrator OUTPUT to TI INPUT HI and LO terminals. (2) Set TI RANGE/FUNCTION switch to 2 DC mA. If TI does not indicate .0000, perform b below. (3) Set TI RANGE/FUNCTION switch and calibrator output as listed in table 5. TI will indicate within the limits specified. b. Adjustments. Adjut R50 CURRENT ZERO (fig. 1) until TI indicates .0000 (R).
Test instrument RANGE/FUNCTION switch settings (Dc mA) 2 20 200 2000 Table 5. Dc Current Test instrument indications Calibrator output (dc current) 1.8 mA 18 mA 180 mA 1.8 A Min 1.7954 17.954 179.54 1795.4 Max 1.8046 18.046 180.46 1804.6

11. Ac Voltage a. Performance Check (1) Connect calibrator OUTPUT to TI INPUT HI and LO terminals. (2) Set TI RANGE/FUNCTION switch and calibrator output as listed in table 6. TI will indicate within the specified limits; if not, perform adjustments indicated. b. Adjustments. No other adjustments can be made.

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TB 9-6625-1957-35
Table 6. Ac Voltage Test instrument RANGE/FUNCTION switch settings (AC VOLTS) 2 20 200 500 500 500 500 200 200 200 20 20 20 2 2 2
1Power

Calibrator output voltage frequency Voltage Frequency 1.8 V 1.0 kHz 18 V 8.0 kHz 180 V 8.0 kHz 450 V1 8.0 kHz 450 V1 20 kHz 450 V1 20 Hz 450 V 1.0 kHz 180 V 20 Hz 180 V 1.0 kHz 180 V 20 kHz 18 V 20 Hz 18 V 1.0 kHz 18 V 20 kHz 1.8 V 20 Hz 1.8 V 1.0 kHz 1.8 V 20 kHz

Test instrument indications Min Max 1.7872 1.8128 17.872 18.128 178.72 181.28 446.65 453.35 444.58 455.42 444.58 455.42 446.65 453.35 177.82 182.18 178.72 181.28 177.82 182.18 17.782 18.218 17.872 18.128 17.782 18.218 1.7782 1.8218 1.7872 1.8128 1.7782 1.8218

Adjustments (fig. 1) (R) R70 AC CAL C42 20 V AC COMP C45 200 V AC COMP C48 500 V COMP -------------------------

amplifier required.

12. Power Supply NOTE Do not perform power supply check if all other parameters are within tolerance. a. Performance Check (1) Connect digital multimeter between TP 1 PIN 24 +5V (fig. 1) and chassis ground. If digital multimeter does not indicate between 4.9 and 5.1 V dc, perform b below. (2) Connect digital multimeter positive lead to TP 2 VR 410 +12 V (fig. 1). Digital multimeter will indicate between 11.0 and 13.0. V dc. (3) Connect digital multimeter positive lead to TP 3 PIN 15 -12 V (fig. 1). Digital multimeter will indicate between -11.4 and -12.6 V dc. (4) Connect digital multimeter positive lead to TP 6 +12 V FLOATING (fig. 1) and negative lead to TP 5 FLOATING GROUND. Digital multimeter will indicate between +11.4 and +12.6 V dc. (5) Move digital multimeter positive lead to TP4 -12 V FLOATING. multimeter will indicate between -11.4 and -12.6 V dc. (6) Move digital multimeter positive lead to TP 7 +5 V FLOATING. multimeter will indicate between +4.5 and +5.5 V dc. Digital Digital

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TB 9-6625-1957-35 b. Adjustments. Adjust R420 5 V ADJ (fig. 1) until digital multimeter indicates +5.00 V dc (R). 13. Final Procedure a. Deenergize and disconnect all equipment and reinstall protective cover on TI. b. Annotate and affix DA label/form in accordance with TB 750-25.

SECTION IV CALIBRATION PROCESS FOR DIGITAL MULTIMETER TEKTRONIX, TYPE DM 501A 14. Preliminary Instructions a. The instructions outlined in paragraphs 14 and 15 are preparatory to the calibration process. Personnel should become familiar with the entire bulletin before beginning the calibration. b. Items of equipment used in this procedure are referenced within the text by common name as listed in table 2. c. Unless otherwise specified, verify the result of each test and, whenever the test requirement is not met, take corrective action before continuing with the calibration. Adjustments required to calibrate the TI are included in this bulletin. Additional maintenance information is contained in the manufacturer's manuals for this TI. d. Unless otherwise specified, all controls and control settings refer to the TI. 15. Equipment Setup WARNING HIGH VOLTAGE is used or exposed during the performance of this calibration. DEATH ON CONTACT may result if personnel fail to observe safety precautions. REDUCE OUTPUT(S) to minimum after each step within the performance check where applicable. a. Remove protective cover from TI only to make adjustments and replace upon completion. b. Connect TI to power module using an extender. Connect power module to a 115 V ac source. Pull power module PWR switch to ON and allow at least 30 minutes for stabilization.

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TB 9-6625-1957-35 16. Dc Voltage a. Performance Check (1) Press pushbuttons as listed in (a) through (c) below: (a) VOLTS DC (in). (b) 2 V range (in). (c) INPUT EXT/INT (out) (EXT). and (2) Short VOLTS/ and LOW terminals. If TI does not indicate between -.0002 +.0002, perform b(l) below.

(3) Press 200 mV range pushbutton. If TI does not indicate between -00.02 and +00.02, perform b(2) below. (4) Remove short and connect calibrator OUTPUT terminals to TI VOLTS/ and LOW terminals. (5) Press TI range pushbutton and set calibrator output as specified in table 7. If TI does not indicate within the specified limits, perform adjustments indicated. b. Adjustments (1) Adjust 2 V DC 0 R1405 (fig. 2) until TI indicates all zeros (R). (2) Adjust 200 mV DC 0 R1415 (fig. 2) until TI indicates all zeros (R).
Test instrument range pushbuttons 2 V 2 V 200mV 20V 200V 1000 V dc Table 7. Dc Voltage Calibrator Test instrument output indications (V dc) Min Max 1.9 1.8989 1.9011 -1.9 -1.8989 -1.9011 .190 189.88 190.12 19 18.989 19.011 190 189.89 190.11 1000 999.3 1000.7 SET CALIBRATOR OUTPUT TO MINIMUM Adjustments (fig. 1) (R) 2VDC R1505 --200 mV DC R1504 20 VDC R1104 200 VDC R1110 1000VDC R1114

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TB 9-6625-1957-35

Figure 2. Tektronix, Type DM 501 A - left side view.

17. Ac Voltage a. Performance Check (1) Connect calibrator OUTPUT to TI VOLTS/ and LOW terminals and press TI VOLTS AC TRUE RMS pushbutton. (2) Press TI range pushbutton and set calibrator output as listed in table 8. TI will indicate within the specified limits; if not perform adjustments indicated. NOTE In the following table, interaction adjustments of R1525 and R1537. may occur in the

WARNING In the following table, use an insulated adjustment tool when adjusting capacitors C1114, C1128 and C1129. The input potential is connected to the metal top of these capacitors. b. Adjustments. No other adjustments can be made.

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TB 9-6625-1957-35
Test instrument range pushbuttons 2 V 2 V 200 mV 20 V 20 V 20 V 20 V 200 V 500 V
1Power

Table 8. Ac Voltage Calibrator output Test instrument voltage frequency indications Voltage Frequency Min Max 100 mV 10 kHz 0.0984 0.1016 1.9 V 10 kHz -1.8876 1.9124 190 mV 1.0 kHz 188.76 191.24 19 V 20 Hz 18.800 19.200 19 V 1.0 kHz 18.876 19.124 19 V 10 kHz 18.876 19.124 19 V 20 kHz 18.800 19.200 190 V 10 kHz 188.76 191.24 500 V1 10 kHz 496.0 504.0

Adjustments (fig. 2) (R) LO VACR1525 2 VAC R1537 ------20 VAC C1114 --200 VAC C1128 500 VAC C1129

amplifier required.

18. Ac dBm/dBV a. Performance Check (1) If necessary place dBm/dBV jumper J1435 P1435 (fig. 2) in dBm position. (2) Connect calibrator OUTPUT to TI VOLTS/ and LOW terminals. Press TI AC TRUE RMS and dB pushbuttons. (3) Press dB range pushbutton and set calibrator output as listed in table 9. TI will indicate within the specified limits; if not, perform adjustments indicated. NOTE In the following table, interaction may occur in the adjustments of R1535 and R1528. Also, a flashing display with the upper segment of the 1 in the most significant digit followed by a "+" or '-", indicates upper or lower limits of range. b. Adjustments. No other adjustments can be made.
Table 9. Ac dBm Test instrument range pushbuttons -20 dB -20 dB -20 dB -40 dB 0 dB 0 dB 0 dB 0 dB +20 dB +40 dB Calibrator output dBm Frequency -20 10 kHz 0.0 10 kHz -40 10 kHz -40 1.0 kHz +10 20 Hz +10 20 kHz -17 1.0 kHz -17 5.0 kHz +22 1.0 kHz +45 1.0 kHz Test instrument indications Min Max -0.5 +0.5 +19.5 +0.5 -18.5 -1.5 -0.5 +0.5 +9.5 +10.5 +9.5 +10.5 -16.5 -17.5 -15.5 -18.5 +1.5 +2.5 +4.5 +5.5 Adjustments (fig. 2) (R) dB R1535 dB GAIN R1528 -----------------

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TB 9-6625-1957-35 19. Dc Current a. Performance Check (1) Connect calibrator OUTPUT to TI mA and LOW terminals. (2) Press TI range pushbutton and set calibrator output as listed in table 10. TI will indicate within the limits specified. b. Adjustments. No adjustments can be made.
Table 10. Dc Current Test instrument range pushbuttons 200 ľA 2 mA 20 mA 200 mA 2000 mA Calibrator output (dc current) 190 ľA 1.9 mA 19 mA 190 mA 1.9 A Test instrument indications Min Max 189.59 190.41 1.8959 1.9041 18.959 19.041 189.59 190.41 1895.9 1904.1

20. Resistance a. Performance Check (1) Connect calibrator OUTPUT to TI input VOLTS/ and LOW terminals. (2) Press TI 20 k pushbutton and release HI-LO pushbutton (HI). (3) Set calibrator for a nominal 19 k output. Adjust calibrator's output adjustment control for a calibrator control display reading equal to the TI's indication. The calibrator's control display ERROR indication will be ą0.166 percent; if not, perform b below. (4) Press TI HI-LO pushbutton (LO) and repeat technique of (3) above. (5) Repeat technique of (2) and (3) above using settings and values listed in table 11. Calibrator's ERROR display will be within the limits specified. b. Adjustments (1) Release HI-LO pushbutton (HI) and set calibrator for a nominal 19 k output. (2) Adjust HI R1426 (fig. 2) for a TI indication equal to calibrator's displayed value for 19 k (R). 14

TB 9-6625-1957-35 (3) Press HI-LO pushbutton (LO); then adjust LO R1412 (fig. 2) for a TI indication equal to calibrator's displayed value for 19 k (R).
Table 11. Resistance Test instrument Range pushbuttons 200 2 2 200 200 2000 2000 20 HI-LO pushbuttons LO LO HI HI LO LO HI HI Calibrator Output normal ERROR resistance display values indications ą(%) .166 190 .166 1.9 k .166 1.9 k .166 190 k .166 190 k .316 1.9 M .166 1.9 M .516 19 M

k k k k k k M

21. Final Procedure a. Deenergize and disconnect all equipment and reinstall protective cover on TI. b. Annotate and affix DA label/form in accordance with TB 750-25.

SECTION V CALIBRATION PROCESS FOR DC HIGH VOLTAGE PROBE, BALLANTINE, MODEL 10800C, JOHN FLUKE, MODEL 80K-40, AND TEKTRONIX, TYPE 010-0277-00 22. Preliminary Instructions a. The instructions outlined in paragraphs 22 and 23 are preparatory to the calibration process. Personnel should become familiar with the entire bulletin before beginning the calibration. b. Items of equipment used in this procedure are referenced within the text by common name as listed in table 2. c. Unless otherwise specified, verify the result of each test and, whenever the test requirement is not met, take corrective action before continuing with the calibration. Adjustments required to calibrate the TI are included in this bulletin. Additional maintenance information is contained in the manufacturer's manuals for this TI d. Unless otherwise specified, all controls and control settings refer to the TI. 15

TB 9-6625-1957-35 23. Equipment Setup WARNING HIGH VOLTAGE is used or exposed during the performance of this calibration. DEATH ON CONTACT may result if personnel fail to observe safety precautions. REDUCE OUTPUT(S) to minimum after each step within the performance check where applicable. a. Connect digital multimeter to power module and connect power module to a 115 V ac source. b. Pull power module PWR switch to ON and allow at least 15 minutes for stabilization. c. Set digital multimeter to 2 V dc range. 24. Dc Probe Check a. Performance Check (1) Connect TI probe terminals to VOLTS/ and LOW connectors on digital multimeter (Type DM 501A), ensuring RED or positive terminal at banana plug mates with VOLTS/ terminal on digital multimeter. (On Type DM 501, ensure that RED or positive terminal of banana plug mates with HI terminal on digital multimeter). (2) Connect ground-lead clip of TI to OUTPUT LO and PROBE tip to OUTPUT HI terminal of calibrator. (3) Set calibrator for 1000 V dc output. between 0.9600 and 1.0400 V, perform b below. If digital multimeter does not indicate

NOTE There is no adjustment for John Fluke, Model 80K-40 or Tektronix, Type 010-0277-00. b. Adjustments (1) Set calibrator to STANDBY; then press RESET pushbutton. (2) Remove 4 screws from cover of TI termination box and remove cover. (3) Set calibrator for a 1000 V dc output. Adjust R1 in TI termination box for a reading of 1.000 V dc on the digital multmeter (R).

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TB 9-6625-1957-35 (4) Set calibrator to STANDBY; then press RESET pushbutton. (5) Replace cover and screws on termination box. 25. Final Procedure a. Deenergize and disconnect all equipment and reinstall protective cover on TI. b. Annotate and affix DA label/form in accordance with TB 750-25.

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TB 9-6625-1957-35 By Order of the Secretary of the Army: Official: GORDON R. SULLIVAN General, United States Army Chief Of Staff

MILTON H. HAMILTON Administrative Assistant to the Secretary of the Army
03650

Distribution: To be distributed in accordance with DA Form 12-34-E, Block No. 2155, requirements for calibration procedure TB-9-6625-1957-35.

US GOVERNMENT PRINTING OFFICE: 1993-733 - 161/60195

PIN: 047997-000