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TB 9-4931-383-50
Change 4 DEPARTMENT OF THE ARMY TECHNICAL BULLETIN

CALIBRATION PROCEDURE FOR VOLTAGE STANDARAD, JOHN FLUKE, MODELS 332A, 332B, AND 332B/AF
Headquarters, Department of the Army, Washington, DC 9 March 1988 TB 9-4931-383-50, 26 July 1976, is changed as follows: 1. Remove old pages and insert new pages as indicated below. New or changed material is indicated by a vertical bar in the margin of the page. Remove pages 3 through 8 11 and 12 Insert pages 3 through 8 11 and 12

2. File this change sheet in front of the publication for reference purposes. By Order of the Secretary of the Army: CARL E. VUONO General, United States Army Chief of Staff Official: R. L. DILWORTH Brigadier General, United States Army The Adjutant General Distribution: To be distributed in accordance with Std. IDS No. RLC-1500, 17 Jun 85.

PIN NO: 009048-004

TB 9-4931-383-50
Change 3 DEPARTMENT OF THE ARMY TECHNICAL BULLETIN

CALIBRATION PROCEDURE FOR VOLTAGE STANDARAD, JOHN FLUKE, MODELS 332A, 332B, AND 332B/AF
Headquarters, Department of the Army, Washington, DC 18 February 1983 TB 9-4931-383-50, 26 July 1976, is changed as follows: 1. Remove old pages and insert new pages as indicated below. New or changed material is indicated by a vertical bar in the margin of the page. Remove pages 19 and 20 Insert pages 19 and 20

2. File this change sheet in front of the publication for reference purposes. By Order of the Secretary of the Army: E. C. MEYER General, United States Army Chief of Staff Official: ROBERT M. JOYCE Major General, United States Army The Adjutant General Distribution: To be distributed in accordance with Std. IDS. No. RLC-1500, 9 September 1982.

PIN NO: 009048-003

This is a reprint, including Changes 1 and 2.

*TB 9-4931-383-50
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN

CALIBRATION PROCEDURE FOR VOLTAGE STANDARD, JOHN FLUKE MODELS 332A, 332B, AND 332B/AF
Headquarters, Department of the Army, Washington, DC 26 July 1976
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, A1 35898-5400. You may also contact this office electronically. E-mail address is [email protected]. FAX to DSN 788-2313 (commercial 256-842-2313). A reply will be furnished directly to you. Paragraph 1 2 3 4 5 Page 2 2 2 3 3

SECTION

I.

IDENTIFICATION AND DESCRIPTION Test instrument identification............................ Calibration data card, DA Form 2416 ................ Calibration description ....................................... EQUIPMENT REQUIREMENTS Equipment required ........................................... Accessories required ........................................... CALIBRATION PROCESS FOR MODEL 332A Preliminary instructions .................................... Regulation........................................................... Zero voltage ........................................................ Linearity ............................................................. Output accuracy and tracking............................ Panel meter, voltage trip, and current limit ...... Power supply ...................................................... Final procedure...................................................

II.

III.

6 7 8 9 10 11 12 13

4 7 9 10 12 16 17 18

_____________ *This bulletin supersedes TB 9-4931-383-50, 31 January 75, including all changes.

TB 9-4931-383-50
IV. CALIBRATION PROCESS FOR MODELS 332B AND 332B/AF Preliminary instructions .................................... Regulation........................................................... Zero voltage ........................................................ Linearity (model 332B)....................................... Linearity (model 332B/AB)................................. Output accuracy and tracking............................ Panel meter (voltage).......................................... Voltage trip ......................................................... Panel meter (current) and current limit ............ Power supply (model 332B) ................................ Power supply (model 332B/AF) .......................... Final procedure...................................................

14 15 16 17 18 19 20 21 22 23 24 25

18 21 22 23 26 27 30 31 32 33 34 34

SECTION I IDENTIFICATION AND DESCRIPTION 1. Test Instrument Identification. This bulletin provides instructions for the calibration of Voltage Standard, John Fluke Models 332A, 332B, and 332B/AF. The manufacturers instruction manuals were used as the prime data source in compiling these instructions. The equipment being calibrated will be referred to as the "TI" (test instrument) throughout this bulletin. a. Model Variations. On model 332A with serial numbers 123 through 332, the X position of voltage dials 2 through 7 is labeled 10. b. Time and Technique. The time required for this calibration is approximately 4 hours, using the dc and low frequency technique. 2. Calibration Data Card, DA Form 2416 a. Forms, records, and reports required for calibration personnel at all levels are prescribed by TM 38-750. DA Form 2416 must be annotated in accordance with TM 38-750 for each calibration performed. b. Adjustments to be reported on DA Form 2416 are designated (R) at the end of the sentence in which they appear. When adjustments are in tables, the (R) will follow the designated adjustment. Report only those adjustments made and designated with (R). 3. Calibration Description. TI parameters and performance specifications which pertain to this calibration are listed in table 1.

2

TB 9-4931-383-50
Table 1. Calibration Description Test Instrument Parameters Performance Specifications1 Voltage range 10-v range; 0 to 11.111110 v (1-ľv steps) 100-v range; 0 to 111.11110 v (10-ľv steps) 1000-v range; 0 to 1111.1110 v (100-ľv steps) Resolution Accuracy 0.1 ppm of range (1 ľv max) 10-v range; ą(0.003% of setting +10 ľv) 100-v range; ą(0.003% of setting +20 ľv) 1000-v range; ą(0.003% of setting +40 ľv) Over-voltage protection Automatically disables output voltage if level exceeds selected value (10 to 110% of selected range). Output current 0 to 50 ma (any voltage setting) Over-current protection Automatically limits output current to present level; between 1 and 60 ma. Line and load regulation 0.0005% of setting or 25 ľv for 10% change in line voltage from nominal.
1The

specifications for models 332B and 332B/AF have been derated to the same as model 332A which are, reflected in this calibration description.

SECTION II EQUIPMENT REQUIREMENTS 4. Equipment Required. Table 2 identifies the specific equipment used in this calibration procedure. This equipment is issued with secondary reference standards calibration set NSN 4931-00-621-7878, and is to be used in performing this procedure. Alternate items may be used by the calibrating activity when the equipment listed in table 2 is not available. 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. When accuracies listed in table 2 provide a four-to-one accuracy ratio between the standard and TI. Where the four-to-one ratio cannot be met, the accuracy of the equipment selected is shown in parenthesis. 5. Accessories Required. The accessories listed in table 3 are issued as indicated in paragraph 4 above and are to be used in this calibration procedure. When necessary, these items may be substituted by equivalent items unless specifically prohibited.
Table 2. Minimum Specifications of Equipment Required Manufacturer, Model, and Common Name Minimum Use Specifications Part Number AUTOTRANSFORMER Range: 105 to 125 vac General Radio, Model Accuracy: ą1% WI0MT3AS3 (7910809) DC TRANSFER Range: 1 and 10 vdc John Fluke, Model 730A/AB (MISSTANDARD 10358, type 2) Accuracy: ą0.0005% when transferred from saturated cells DECADE RESISTOR Range: 20 to 200 ohms Biddle-Gray, Model 601147-1 Accuracy: ąl (7910328) NULL DETECTOR Range: 0 to 1000 vdc John Fluke, Model 845AB Accuracy: N/A (8205517)

Item A1 A2

A3 A4

3

TB 9-4931-383-50
Item A5 A6 A7 A8 A9 Table 2. Minimum Specifications of Equipment Required - Continued. Minimum use Manufacturer, Model, Common name specifications and Part Number John Fluke, Model 332A OPERATING VOLTAGE Range: 999 to 1000 vdc (7911393) or 332B/AF (6625SOURCE. Stability: 0.0015% of setting 150-6994) +20ľv STANDARD CELL Test report specifications Guildline, Model 9154B (MIS10364) VOLTAGE DIVIDER Range: 0 to 1.000000 ESI, Model RV726 (MIS-10295) Accuracy: ą0.25 ppm FS VOLTAGE REGULATOR Range: 115 vac Superior Electric Co., Model EM Accuracy: ą0.75% 4102 (8616523) VOLTMETER Range: 6 to 16 vdc John Fluke, Model 887 ABAN (P/0 Accuracy: ą0.0025% MIS-10216) Table 3. Accessories Required Common Name Description And Part Number SENSITIVITY SWITCH Sensitivity and reversing switch; galvanometer key (7913207) WIRE Shielded pair, No. 18 AWG, solid copper conductor (MIS-10312) ADAPTER Power cord adapter, T210 (7912356) LEAD 1 18-in., spade lug terminations (black) (791129213)

Item B1 B2 B3 B4
1Four

required.

SECTION III CALIBRATION PROCESS FOR MODEL 332A 6. Preliminary Instructions a. The instructions outlined in this paragraph are preliminary to the calibration process. Personnel should become familiar with the applicable sections before beginning the calibration. b. Items of equipment used in this procedure are referenced within the text by common name and item identification number as listed in tables 2 and 3. For the identification of equipment referenced by item numbers prefixed with A, see table 2 and for prefix B, see table 3. WARNING HIGH VOLTAGE is used during the performance of this calibration. DEATH ON CONTACT may result if personnel fail to observe safety precautions. NOTE Unless otherwise specified, verify the results of each test and take corrective action whenever the test requirement is not met before continuing with the calibration. 4

TB 9-4931-383-50 NOTE Unless otherwise specified, all controls and control settings refer to the TI. c. When indications specified in paragraph 10 are not within tolerance, perform the power supply check prior to making adjustments. After adjustments are made, repeat paragraph 10. Do not perform power supply check if all other parameters are within tolerance. d. Position TI controls as listed in (1) through (5) below: (1) VOLTAGE RANGE switch to 10. (2) Voltage dials to 1.000000. (3) METER switch to VOLTAGE. (4) VOLTAGE TRIP control fully clockwise. (5) CURRENT LIMIT control fully clockwise. e. Connect TI to autotransformer (A1) and leave connected throughout procedure. NOTE The sensitivity switch (B1) has been included in equipment setup for safety and to allow reversal of connections to null detector (A4). Detailed operation of the switch is not included in step-by-step procedure. f. Connect autotransformer to a 115-volt ac source and adjust for a 115-volt output. g. Turn POWER switch to STANDBY/RESET and allow at least 1 hour for warm-up. h. Connect operating voltage source (A5) to voltage regulator (A8), set its POWER switch to STANDBY/ RESET, and allow to warm-up until called for. i. It is necessary to know actual value of 1.018 +E output of dc transfer standard (A2) to complete this calibration. If calibration of dc transfer standard is no more than 10 days old, the value recorded at time of calibration is sufficient. If calibration is more than 10 days old, determine the value by performing (1) through (11) below: (1) Connect equipment as shown in figure 1.

5

TB 9-4931-383-50

Figure 1. Measurement of 1.018 + E output of dc transfer standard - equipment setup.

NOTE When adjusting for a null indication on null detector, always start on highest range of null detector and proceed down range to required sensitivity. When reading is complete, return null detector to high range. (2) Adjust dc transfer standard (A2) for 1.1018 + E mean output and set E dials to last three digits of standard cell (A6) certificate value. 6

TB 9-4931-383-50 (3) Set voltage divider (A7) to one-tenth of value of dc transfer standard setting. (4) Adjust TI for a nominal 10-volt output and set its POWER switch to ON. (5) Adjust TI voltage dials for a null indication on null detector (A4). Do not change TI voltage dials until instructed. (6) Set TI POWER switch to STANDBY/RESET. (7) Replace dc transfer standard with standard cell in equipment setup. (8) Set TI POWER switch to ON. (9) Adjust voltage divider for a null indication on null detector. Record the voltage divider indication. (10) Set TI POWER switch to STANDBY/RESET. (11) Compute the actual value of the dc transfer standard output as follows. If in step (9) above the voltage divider setting was increased, subtract the amount of change multiplied by 10 from the standard cell value. If the setting was decrease add the amount of change multiplied by 10 to the standard cell value. Record the value for future use. 7. Regulation a. Performance Check (1) Connect equipment as shown in figure 2. (2) Set decade resistor (A3) to 20 ohms. (3) Set voltage divider (A7) to .999999X. (4) Adjust dc transfer standard (A2) for a 1-volt mean output. ON. (5) Adjust TI voltage dials for a nominal 1-volt output and turn POWER switch to

(6) Adjust TI voltage dials for a null indication on null detector (A4). Record voltage dial indication. (7) Adjust autotransformer (A1) output to 105 volts and wait 1 minute. (8) Adjust TI voltage dials for a null indication on null detector.

7

TB 9-4931-383-50

Figure 2. Regulation - equipment setup.

8

TB 9-4931-383-50 above. (9) TI voltage dials will indicate within ą25 microvolts of value recorded in (6)

(10) Adjust autotransformer output to 125 volts and wait 1 minute. (11) Adjust TI voltage dials for a null indication on null detector. (12) TI voltage dials will indicate within ą25 microvolts of value recorded in (6) above. (13) Adjust autotransformer output to 115 volts. (14) Remove decade resistor from equipment setup and wait 1 minute. (15) Adjust TI voltage dials for a null indication on null detector. (16) TI voltage dials will indicate within ą25 microvolts of value recorded in (6) above. (17) Turn POWER switch to STANDBY/RESET. b. Adjustments. No adjustments can be made. 8. Zero Voltage a. Performance Check 000. (1) Set dc transfer standard (A2) for (supply number 1) E output and E control to (2) Position TI controls as listed in (a) through (c) below: (a) VOLTAGE RANGE switch to 1000. (b) Voltage dials to 0000000. (c) POWER switch to ON. (A4). (3) Adjust E control of dc transfer standard for a null indication on null detector

(4) If E control of dc transfer standard does not indicate 0ą40 microvolts, perform b(1) below. NOTE If reading is negative, reverse leads at OUTPUT of dc transfer standard. 9

TB 9-4931-383-50 (5) Set VOLTAGE RANGE switch to 100. (6) Repeat (3) above. (7) If E control of dc transfer standard does not indicate, 0 ą20 microvolts, perform b(2) below. (8) Set VOLTAGE RANGE switch to 10. (9) Repeat (3) above. (10) If E control of dc transfer standard does not indicate 0 ą10 microvolts, perform b(3) below. (11) Set POWER switch to STANDBY/RESET. b. Adjustments WARNING Dangerous potentials exist between chassis and ground. Exercise extreme caution. (1) Set E control of dc transfer standard to 000 and adjust R112 (fig. 3) for a null indication on null detector (R). (2) Set E control of dc transfer standard to 000 and adjust R110 (fig. 3) for a null indication on null detector (R). (3) Set E control of dc transfer standard to 000 and adjust R108 (fig. 3) for a null indication on null detector (R). 9. Linearity a. Performance Check (1) Set voltage divider (A7) to .1000000. (2) Set dc transfer standard (A2) for a 1-volt mean output. (3) Position TI controls as listed in (a) through (c) below: (a) VOLTAGE RANGE switch to 1000. (b) Voltage dials to 00X.0000. (c) POWER switch to ON.

10

TB 9-4931-383-50 (4) Adjust voltage divider for a null indication on null detector (A4) (within ą10 microvolts). Record null detector indication. (5) Set TI voltage dials to 010.0000. (6) If null detector indication is not within ą1 microvolt of value recorded in (4) above, perform b(1) and (2) below. (7) Repeat the technique of (1) through (6) above, using settings, indications, and adjustments listed in table 4.
Table 4. Linearity Test Instrument Switch Settings. Voltage Dial Step (3) Step (5) (B) 01X.0000 020.0000 03X.0000 05X.0000 07X.0000 09X.0000 0X.00000 1X.00000 3X.00000 5X.00000 7X.00000 9X.00000 040.0000 060.0000 080.0000 0X0.0000 10.00000 20.00000 40.00000 60.00000 80.00000 100.00000 Voltage Divider Initial Setting. .5000000 .2500000 .1666666 .1250000 .1000000 .1000000 .5000000 .2500000 .1666666 .1250000 .1000000 Dc Transfer Standard Output. 10-volt mean 10-volt mean 10-volt mean 10-volt mean 1-volt mean 10-volt mean 10-volt mean 10-volt mean 10-volt mean 10-volt mean 10-volt mean Maximum Difference Allowed (ľV) 1 10 10 20 20 20 1 10 10 20 20 20

Voltage Range 1000 1000 1000 1000 1000 100 100 100 100 100 100
1If 2Report

Adjustments (fig. 3) 2 R908 (R) R909 (R) R910 (R) R911 (R) R912 (R) R901 (R)3 R902 (R) R903 (R) R904 (R) R905 (R) R906 (R)

difference exceeds this value, perform adjustment. adjustments only if difference is greater than 100 microvolts. 3Report this adjustment if difference is greater than 30 microvolts.

(8) Set POWER switch to STANDBY/RESET. b. Adjustments WARNING Dangerous potentials exist between chassis and ground. Exercise extreme caution. (1) Adjust R907 (fig. 3) for same indication on null detector (R). (Report only if difference is greater than 30 microvolts.) 11

TB 9-4931-383-50

Figure 3. Model 332A top view - adjustment locations.

(2) Repeat a above until no further adjustments are required. 10. Output Accuracy and Tracking a. Performance Check (1) Set voltage divider (A7) to one-tenth of actual value of dc transfer standard (A2) output determined in paragraph 6i above. (2) Set dc transfer standard for 1.018 + E, mean output and set E dials to last three digits of standard cell value. (3) Position TI controls as listed in (a) through (c) below: (a) VOLTAGE RANGE switch to 10. (b) Voltage dials to 10.000000. (c) POWER switch to ON. (4) Adjust TI voltage dials for a null indication on null detector (A4). 12

TB 9-4931-383-50 (5) If TI voltage dials do not indicate between 9.999690 and 10.000310, perform b(1) and (2) below. below. (6) If TI voltage dials are within tolerance but not exactly 10.000000, perform b(3) (7) Set dc transfer standard for a 10-volt mean output. (8) Set voltage divider to .999999X. (9) Adjust TI voltage dials for a null indication on null detector. (10) Record TI dial indication for future use. output of dc transfer standard. This is the actual value of 10-volt

(11) Set dc transfer standard for 1.018 + E, mean output and sets E dial to 000. (12) Set TI voltage dials to 8.888888. (13) Adjust voltage divider for a null indication on null detector. (14) Voltage divider will indicate between .1145215 and .1145286. (15) Repeat technique of (12) through (14) above, using settings and indications listed in table 5. Set TI POWER switch to STANDBY/RESET.
Table 5. Tracking Test Instrument Voltage Dial Settings 6.666666 5.555555 4.444444 2.222222 Voltage Divider Initial Settings .1527000 .1832400 .2290500 .4581000 Voltage Divider Indications Min Max .1526952 .1527048 .1832342 .1832459 .2290427 .2290574 .4580842 .4581159

(16) Set voltage divider to one-hundredth of value recorded in (10) above. (17) Set dc transfer standard for a 10-volt mean output. (18) Position TI controls as listed in (a) through (c) below: (a) VOLTAGE RANGE to 100. (b) Voltage dials to 100.000000. (c) POWER switch to ON. (19) Adjust TI voltage dials for a null indication on null detector. 13

TB 9-4931-383-50 (20) If TI voltage dials do not indicate between 99.99698 and 100.00302, perform b(4) and (5) below. below: (21) If TI voltage dials are within tolerance but not exactly 100.00000, perform b(6) (22) Set TI POWER switch to STANDBY/RESET. (23) Connect equipment as shown in figure 4. (24) Set voltage divider to .1000000. (25) Set operating voltage source (A5) VOLTAGE RANGE switch to 1000 and voltage dials to 1000.0000. (26) Set TI and operating voltage source POWER switches to ON. (27) Adjust operating voltage source voltage dials for a null indication on null detector. (28) Set TI and operating voltage source POWER switches to STANDBY/RESET. (29) Set voltage divider to .999999X. (30) Set TI VOLTAGE RANGE switch to 1000 and voltage dials to 1000.0000. (31) Set TI and operating voltage source POWER switches to ON. (32) Adjust TI voltage dials for a null indication on null detector. (33) If TI voltage dials do not indicate between 999.9699 and 1000.0300, perform b(1) and (8) below. (34) Set TI and operating voltage source POWER switches to STANDBY/RESET. b. Adjustments WARNING Dangerous potentials exist between chassis and ground. Exercise extreme caution. NOTE Due to interaction of RANGE adjustments, adjustment of one range will require checking and, if necessary, readjustment of other ranges.

14

TB 9-4931-383-50

Figure 4. High voltage - equipment setup.

15

TB 9-4931-383-50 (1) Set TI voltage dials to 10.000000. (2) Adjust R804 (fig. 3) for a null indication on null detector (R). (3) Perform (1) and (2) above, but do not report adjustments. (4) TI voltage dials to 100.00000. (5) Adjust R806 (fig. 3) for a null indication on null detector (R). (6) Perform (4) and (5) above, but do not report adjustment. (7) Set TI voltage dials to 1000.0000. (8) Adjust R808 (fig. 3) for a null indication on null detector (r). 11. Panel Meter, Voltage Trip, and Current Limit a. Performance Check (1) Disconnect TI from equipment setup. (2) Set VOLTAGE RANGE switch to 10, POWER switch to ON, and voltage dials for indication of 10 on 0-to-12 scale of panel meter. (3) If voltage dials do not indicate between 9.700000 and 10.300000, perform b(1) and (2) below. (4) Set voltage dials to 6.000000. (5) Slowly turn VOLTAGE TRIP control counter clockwise until voltage trip circuit actuates. If the VOLTAGE TRIP control is not an approximately midrange, perform b(3) through (7) below. (6) Set POWER switch to STANDBY/RESET. (7) Connect decade resistor (A3) to OUTPUT terminals and adjust to 100 ohms. (8) Position TI controls as listed in (a) through (d) below: (a) METER switch to CURRENT. (b) Voltage dials to 0000000. (c) VOLTAGE TRIP control fully clockwise. (d) POWER switch to ON. 16

TB 9-4931-383-50 (9) Adjust voltage dials for indication of 60 milliamperes on panel meter. (10) If voltage dials do not indicate between 5.820000 and 6.180000, perform b(8) through (11) below. (11) Set POWER switch to STANDBY/RESET. b. Adjustments WARNING Dangerous potentials exist between chassis and ground. Exercise extreme caution. (1) Set voltage dials to 10.000000. (2) Adjust R210 (fig. 3) for null indication on null detector (R). (3) Set VOLTAGE TRIP control fully clockwise. (4) Set POWER switch to STANDBY/RESET and back to ON. (5) Adjust R213 (fig. 3) fully counterclockwise. (6) Set VOLTAGE TRIP control to midrange. (7) Slowly adjust R213 clockwise until voltage trip circuit actuates (R). (8) Set voltage dials to 6.000000. (9) Adjust R617 (fig. 3) fully counterclockwise then clockwise until LIMIT ON lamp comes on. Panel meter should indicate 60 milliamperes (R). (10) Turn CURRENT LIMIT control to 0 (zero). (11) Adjust R615 (fig. 3) for indication of 1 milliampere on panel meter (R). 12. Power Supply a. Performance Check NOTE Do not perform power supply checks if all other parameters are within tolerance.

17

TB 9-4931-383-50 WARNING Dangerous potentials exist between chassis and ground. Exercise extreme caution. (1) Connect voltmeter (A9) to -TEST POINT and +TEST POINT (fig. 3). (2) Position TI controls as listed in (a) through (g) below: (a) METER switch to VOLTAGE. (b) VOLTAGE RANGE switch to 1000. (c) Voltage dials to 00X.0000. (d) VOLTAGE TRIP switch to 1000. (e) VERNIER control fully clockwise. (f) CURRENT LIMIT control fully clockwise. (g) POWER switch to OPR. below. (3) If voltmeter does indicate between 6.01999 and 6.02001 volts dc perform b Adjust R802 (fig. 3) for an indication of 6.02000 volts dc on

b. Adjustments. voltmeter. 13. Final Procedure

a. Deenergize and disconnect all equipment. b. In accordance with TM 38-750, annotate and affix DA label 80 (US Army Calibration System). When TI cannot be adjusted within tolerance, annotate and affix DA Form 2417 (Unserviceable or Limited Use) tag.

SECTION IV CALIBRATION PROCESS FOR MODELS 332B AND 332B/AF 14. Preliminary Instructions a. The instructions outlined in this paragraph are preparatory to the calibration process. Personnel should become familiar with the applicable sections before beginning the calibration.

18

TB 9-4931-383-50 b. Items of equipment used in this procedure are referenced within the text by common name and item identification number as listed in tables 2 and 3. For the identification of equipment referenced by item numbers prefixed with A, see table 2, and for prefix B, see table 3. WARNING HIGH VOLTAGE is used during the performance of this calibration. DEATH ON CONTACT may result if personnel fail to observe safety precautions. NOTE Unless otherwise specified, verify the results of each test and take corrective action whenever the test requirement is not met before continuing with the calibration. NOTE Unless otherwise specified, all controls and control settings refer to the TI. c. When indications specified in paragraph 19 are not within tolerance, perform the power supply check prior to making adjustments. After adjustments are made, repeat paragraph 19. Do not perform power supply check if all other parameters are within tolerance. d. Position TI controls as listed in (1) through (5) below: (1) VOLTAGE RANGE switch to 10. (2) Voltage dials to 1.000000. (3) METER switch to VOLTAGE. (4) VOLTAGE TRIP control fully clockwise. (5) CURRENT LIMIT control fully clockwise. e. Connect TI to autotransformer (A1) and leave connected throughout procedure. NOTE The sensitivity switch (B1) has been included in equipment setups for safety and to allow reversal of connections to null detector. Detailed operation of the switch is not included in step-by-step procedure. f. Connect autotransformer to 115-volt source and adjust for 115-volt output. g. Turn POWER switch to STDBY/RESET and allow at least 1 hour for warm-up. 19

TB 9-4931-383-50 h. Connect operating voltage source (A5) to voltage regulator (A8), set its POWER switch to STDBY/ RESET, and allow to warm up until called for. i. It is necessary to know actual value of 1.018 + E output of dc transfer standard (A2) to complete this calibration. If calibration of dc transfer standard is no more than 10 days old, the value recorded at time of calibration is sufficient. If calibration is more than 10 days old, determine the value by performing (1) through (11) below: NOTE When adjusting for a null indication on null detector (A4), always start on highest range of null detector and proceed down range to required sensitivity. When reading is complete, return null detector to high range. (1) Connect equipment as shown if figure 1. (2) Adjust dc transfer standard (A2) for 1.018 + E mean output and set E dials to last three digits of standard cell (A6) certificate value. (3) Set voltage divider (A7) to one-tenth of value of dc transfer standard setting. (4) Adjust TI for a nominal 10-volt output and set its POWER switch to OPR. (5) Adjust TI voltage dials for a null indication on null detector (A4). Do not change TI voltage dials until instructed. (6) Set TI POWER switch to STDBY/RESET. (7) Replace dc transfer standard with standard cell in equipment setup. (8) Set TI POWER switch to OPR. (9) Adjust voltage divider for a null indication on null detector. divider indication. (10) Set TI POWER switch to STDBY/RESET. (11) Compute the actual value of the dc transfer standard output as follows. If in step (9) above the voltage divider setting was increased, subtract the amount of change multiplied by 10 from the standard cell value. If the setting was decreased, add the amount of change multiplied by 10 to the standard cell value. Record the value for future use. Record voltage

20

TB 9-4931-383-50 15. Regulation a. Performance Check (1) Connect equipment as shown in figure 2. (2) Set decade resistor (A3) to 20 ohms. (3) Set voltage divider (A7) to .999999X. (4) Adjust dc transfer standard (A2) for a 1-volt mean output. OPR. (5) Adjust TI voltage dials for a nominal 1-volt output and turn POWER switch to Record

(6) Adjust TI voltage dials for a null indication on null detector (A4) . voltage dial indication. (7) Adjust autotransformer (A1) output to 105 volts and wait 1 minute. (8) Adjust TI voltage dials for a null indication on null detector. above.

(9) TI voltage dials will indicate within ą25 microvolts of value recorded in (6)

(10) Adjust autotransformer output to 125 volts and wait 1 minute. (11) Adjust TI voltage dials for a null indication on null detector. (12) TI voltage dials will indicate within ą25 microvolts of value recorded in (6) above. (13) Adjust autotransformer output to 115 volts. (14) Remove decade resistor from equipment setup and wait 1 minute. (15) Adjust TI voltage dials for a null indication on null detector. (16) TI voltage dials will indicate within ą25 microvolts of value recorded in (6) above. (17) Turn POWER switch to STDBY/RESET. b. Adjustments. No adjustments can be made.

21

TB 9-4931-383-50 16. Zero Voltage a. Performance Check (1) Set dc transfer standard (A2) for (supply number 1) E output and set E control to 000. (2) Position TI controls as listed in (a) through (c) below: (a) VOLTAGE RANGE switch to 1000. (b) Voltage dials to 0000000. (c) POWER switch to OPR. (A4). (3) Adjust E control of dc transfer standard for a null indication on null detector

(4) If E control of dc transfer standard does not indicate 0ą40 microvolts, perform b(1) below. NOTE If reading is negative, reverse leads at OUTPUT of dc transfer standard. (5) Set VOLTAGE RANGE switch to 100. (6) Repeat (3) above. (7) If E control of dc transfer standard does not indicate 0 ą20 microvolts, perform b(2) below. (8) Set VOLTAGE RANGE switch to 10. (9) Repeat (3) above. (10) If E control of dc transfer standard does not indicate 0 ą10 microvolts, perform b(3) below. (11) Set POWER switch to STDBY/RESET. b. Adjustments

22

TB 9-4931-383-50 WARNING Dangerous potential exists between chassis and ground. Exercise extreme caution. (1) Set E control of dc transfer standard to 000 and adjust R6, 1000V ZERO OUTPUT ADJUST (fig. 5 or 6) for a null indication on null detector (R). (2) Set E control of dc transfer standard to 000 and adjust R4, 100V ZERO OUTPUT ADJUST(fig. 5 or 6) for a null indication on null detector (R). (3) Set E control of dc transfer standard to 000 and adjust R2, 10V ZERO OUTPUT ADJUST (fig. 5 or 6) for a null indication on null detector (R). 17. Linearity (Model 332B) a. Performance Check (1) Set voltage divider (A7) to .1000000. (2) Set dc transfer standard (A2) for a 1-volt mean output. (3) Position TI controls as listed in (a) through (c) below: (a) VOLTAGE RANGE switch to 1000. (b) Voltage dials to 00X.0000. (c) POWER switch to OPR. (4) Adjust voltage divider for a null indication on null detector (A4) (within ą10 microvolts). Record null detector indication. (5) Set TI voltage dials to 010.0000. (6) If null detector indication is not within ą1 microvolt of value recorded in (4) above, perform b(1) and (2) below. (7) Repeat the technique of (1) through (6) above, using settings, indications, and adjustments listed in table 6. (8) Set POWER switch to STDBY/RESET. NOTE Dangerous potentials exist between chassis and ground. Exercise extreme caution.

23

TB 9-4931-383-50

Figure 5. Model 332B, top view - adjustment location.

24

TB 9-4931-383-50

Figure 6. Model 332B/AF, top view - adjustment location.

25

TB 9-4931-383-50
VOLTAGE RANGE Test Instrument Switch Settings. Voltage Dial Step Step (5) (3)(B) 01X.0000 020.0000 03X.0000 040.0000 05X.0000 060.0000 07X.0000 080.0000 09X.0000 0X0.0000 0X.00000 10.00000 1X.00000 20.00000 3X.00000 40.00000 5X.00000 60.00000 7X.00000 80.00000 9X.00000 100.00000 Table 6. Linearity Dc Transfer Voltage Standard Divider Output. Initial Setting .5000000 .2500000 .1666666 .1250000 .1000000 .1000000 .5000000 .2500000 .1666666 .1250000 .1000000 10-volt mean 10-volt mean 10-volt mean 10-volt mean 10-volt mean 1-volt mean 10-volt mean 10-volt mean 10-volt mean 10-volt mean 10-volt mean Maximum Difference Allowed (ľV)1 10 10 20 20 20 1 10 10 20 20 20 Adjustment s (fig. 5)2 B2 (R) B4 (R) B6 (R) B8 (R) BX (R) A1 (R)3 A2 (R) A4 (R) A6 (R) A8 (R) A10 (R)

1000 1000 1000 1000 1000 100 100 100 100 100 100
1If 2Report

difference exceeds this value, perform adjustment. adjustments only if difference is greater than 100 microvolts. 3Report this adjustment if difference is greater than 30 microvolts.

(1) Adjust DECK B adjustment 1 (fig. 5) for same indication on null detector (R). (Report only if difference is greater than 30 microvolts.) (2) Repeat a above until no further adjustments required. 18. Linearity (Model 332B/AF) a. Performance Check (1) Set voltage divider (A7) to .999999X. (2) Set dc transfer standard (A2) for a 1-volt mean output. (3) Position TI controls as listed in (a) through (c) below: (a) VOLTAGE RANGE switch to 1000. (b) Voltage dials to 000.X000. (c) POWER switch to OPR. NOTE If null indication cannot be obtained at a 000.X000 dial setting, adjust R1, CAL 1000V (fig. 6) to obtain a null indication. (4) Adjust voltage divider for a null indication on null detector (A4) (within ą10 microvolts). Record null detector indication. (5) Set voltage dials to 001.0000. 26

TB 9-4931-383-50 (6) If null detector indication is not within ą10 microvolts of value recorded in (4) above, perform b(1) and (2) below. (7) Repeat the technique of (1) through (6) above using settings, indications, and adjustments listed in table 7.
VOLTAGE RANGE 1000 1000 1000 1000 100 100 100 100 10 10 10
1If 2Report

Test Instrument Switch Setting Voltage Dials Step (5) Step (3)(B) 001X.000 002.0000 003.X000 004.0000 007.X000 008.0000 00X.0000 010.0000 01.X0000 02.00000 03.X0000 04.00000 07.X0000 08.00000 0X.00000 10.00000 1.X00000 2.000000 3.X00000 4.000000 7.X00000 8.000000

Table 7. Linearity Voltage Divider Dc Transfer Initial Standard Settings. Output. .5000000 1-volt mean .2500000 1-volt mean .1250000 1-volt mean .1000000 1-volt mean .5000000 1-volt mean .2500000 1-volt mean .1250000 1-volt mean .1000000 1-volt mean .5000000 1-volt mean .2500000 1-volt mean .1250000 1-volt mean

Maximum Difference Allowed 1 (ľV). 1 1 1 1 1 1 1 1 1 1 1

Adjustments (Fig. 6)2 C2 (R) C4 (R) C8 (R) B1 (R) B2 (R) B4 (R) B8 (R) A1 (R) A2 (R) A4 (R) A8 (R)

difference exceeds this value, perform adjustment. adjustments only if difference is greater than 30 microvolts.

(8) Set POWER switch to STDBY/RESET. b. Adjustments WARNING Potential exist between chassis and ground. Exercise extreme caution. (1) Adjust DECK C adjustment 1 (fig. 6) for same indication on null detector (R). (Report only if (difference is greater than 100 microvolts.) (2) Report a above until no further adjustments are required. 19. Output Accuracy and Tracking a. Performance Check (1) Set voltage divider (A7) to one-tenth of actual value of dc transfer standard (A2) output determined in paragraph 14i above. (2) Set dc transfer standard for 1.018 + E, mean output and set E dials to last three digits of standard cell value. (3) Position TI controls as listed in (a) through (c) below: 27

TB 9-4931-383-50 (a) VOLTAGE RANGE switch to 10. (b) Voltage dials to 10.000000. (c) POWER switch to OPR. (4) Adjust TI voltage dials for a null indication on null detector (A4). (5) If TI voltage dials do not indicate between 9.999690 and 10.000310, perform b(1) and (2) below. below. (6) If TI voltage dials are within tolerance but not exactly 10.000000, perform b(3) (7) Set dc transfer standard for a 10-volt mean output. (8) Set voltage divider to .999999X. (9) Adjust TI voltage dials for a null indication on null detector. (10) Record TI dial indication for future use. output of dc transfer standard. This is the actual value of 10-volt

(11) Set dc transfer standard for 1.018 + E, mean output and set E dial to 000. (12) Set TI voltage dials to 8.888888. (13) Adjust voltage divider for a null indication on null detector. (14) Voltage divider will indicate between .1145215 and .1145286. (15) Repeat technique of (12) through (14) above, using settings and indications listed in table 8. Set TI POWER switch to STDBY/RESET.
Table 8. Voltage Dial Tracking Test Instrument Voltage Dial Settings 4.444444 2.222222 1.111111 Voltage Divider Initial Settings. .2290500 .4581005 .9162001 Voltage Divider Indications. Min Max .2290427 .2290574 .4580842 .4581159 .9161644 .9162358

(16) Set voltage divider to one-hundredth of value recorded in (10) above. (17) Set dc transfer standard for a 10-volt mean output. (18) Position TI controls as listed in (a) through (c) below: 28

TB 9-4931-383-50 (a) VOLTAGE RANGE switch to 100. (b) Voltage dials to 100.00000. (c) POWER switch to OPR. (19) Adjust TI voltage dials for a null indication on null detector. (20) If TI voltage dials do not indicate between 99.99698 and 100.00302, perform b(4) and (5) below. below. (21) If TI voltage dials are within tolerance but not exactly 100.00000, perform b(6) (22) Set POWER switch to STDBY/RESET. (23) Connect equipment as shown in figure 4. (24) Set voltage divider to .1000000. (25) Set operating voltage source (A5) VOLTAGE RANGE switch to 1000 and voltage dials to 1000.0000. (26) Set TI and operating voltage source POWER switches to OPR. (27) Adjust operating voltage source voltage dials for a null indication on null detector. (28) Set TI and operating voltage source POWER switches to STDBY/RESET. (29) Set voltage divider to .999999X (30) Set TI VOLTAGE RANGE switch to 1000 and voltage dials to 1000.0000. (31) Set TI and operating voltage source POWER switches to OPR. (32) Adjust TI voltage dials for a null indication on null detector. (33) If TI voltage dials do not indicate between 999.9699 and 1000.0300, perform b(7) and (8) below. (34) Set TI and operating voltage source POWER switches to STDBY/RESET. b. Adjustments

29

TB 9-4931-383-50 WARNING Dangerous potentials exist between chassis and ground. Exercise extreme caution. NOTE Due to interaction of range adjustments, adjustment of one range will require checking and, if necessary, readjustment of other ranges. (1) Set TI voltage dials to 10.000000. (2) Adjust R9, CAL 10V (fig. 5 or 6) for a null indication on null detector (R). (3) Perform (1) and (2) above but do not report adjustment. (4) Set TI voltage dials to 100.00000. (5) Adjust R5, CAL 100V (fig. 5 or 6) for a null indication on null detector (R). (6) Perform (4) and (5) above but do not report adjustment. (7) Set TI voltage dials to 1000.0000. (8) Adjust R1, CAL 1000V (fig. 5 or 6) for a null indication on null detector (R). 20. Panel Meter (Voltage) a. Performance Check (1) Disconnect TI from equipment setup. (2) Set VOLTAGE RANGE switch to POWER switch to OPR. (3) Adjust voltage dials for indication of 1.0 on 0-to-1.0 scale of panel meter. below. (4) If voltage dials do not indicate between 9.700000 and 10.300000, perform b (5) Set POWER switch to STDBY/RESET. b. Adjustments WARNING Dangerous potentials exist between chassis and ground. Exercise extreme caution. (1) Set voltage dials to 10.000000. 30

TB 9-4931-383-50 (2) Adjust OUTPUT VOLTMETER adjust (fig. 5 or 6) for indication of 1.0 on 0-to1.0 scale of panel meter (R). 21. Voltage Trip a. Performance Check (1) Position TI controls as listed in (a) through (d) below: (a) Voltage dials to 10.X00000. (b) VOLTAGE TRIP to 10. (c) VERNIER fully clockwise. (d) POWER switch to OPR. (2) Turn VERNIER control counterclockwise until trip circuit actuates. If VERNIER control is not approximately 30 degrees from fully clockwise, perform b below. (3) Repeat technique of (1) and (2) above, using settings listed in table 9.
Table 9. Voltage Trip Test Instrument Switch Settings VOLTAGE TRIP VOLTAGE RANGE Voltage Dials 100 100 10X.X0000 10000 1000 10XX.X000

(4) Position TI controls as listed in (a) through (d) below: (a) VOLTAGE RANGE switch to 10. (b) Voltage dials to 4.000000. (c) VOLTAGE TRIP switch to 10. (d) VERNIER control to 12 o'clock. (5) Turn VOLTAGE RANGE switch to 100. Voltage trip circuit will actuate. (6) Turn VOLTAGE TRIP switch to 100 and reset TI. (7) Turn VOLTAGE RANGE switch to 1000. Voltage trip circuit will actuate. (8) Turn VOLTAGE TRIP switch to 1000 and VERNIER control fully clockwise. Reset TI. (9) Turn VOLTAGE RANGE switch to 100. Voltage trip circuit will not actuate. 31

TB 9-4931-383-50 (10) Turn VOLTAGE RANGE switch to 10. Voltage trip circuit will not actuate. (11) Set POWER switch to STDBY/RESET. b. Adjustments (1) Position TI controls as listed in (a) through (d) below: (a) VOLTAGE RANGE switch to 1000. (b) Voltage dials to 125.0000. (c) VOLTAGE TRIP switch to 100. (d) VERNIER control fully clockwise. (2) Turn VOLTAGE TRIPOUT ADJUST (fig. 5 or 6) fully counterclockwise. (3) Set POWER switch to OPR. (4) Adjust VOLTAGE TRIPOUT ADJUST clockwise until voltage trip circuit actuates (R). (5) Repeat a(1) and (2) above. 22. Panel Meter (Current) and Current Limit a. Performance Check (1) Adjust decade resistor (A3) for 100 ohms and connect to OUTPUT terminals. (2) Position TI controls as listed in (a) through (f) below: (a) METER switch to CURRENT. (b) VOLTAGE RANGE switch to 10. (c) VOLTAGE TRIP switch to 1000. (d) VERNIER control fully clockwise. (e) Voltage dials to 0000000. (f) POWER switch to OPR. (3) Adjust voltage dials for indication of 55 milliamperes on panel meter. If voltage dials do not indicate between 5.335000 and 5.665000, perform b(1) and (2) below. 32

TB 9-4931-383-50 (4) Adjust voltage dials to 6.000000. If CURRENT LIMIT lamp is not on, perform b(3) below. (5) Adjust CURRENT LIMIT control fully counterclockwise. If panel meter does not indicate .5 milliampere and CURRENT LIMIT lamp is not on, perform b(4) below. (6) Set POWER switch to STDBY/RESET. b. Adjustments (1) Set voltage dials to 5.500000. (2) Adjust R2, OUTPUT CURRENT METER ADJUST (fig. 5 or 6) for indication of 55 milliamperes on panel meter (R). (3) Adjust R23 (fig. 5 or 6) until CURRENT LIMIT lamp comes on, then back off until lamp just goes out (R). (4) Adjust R24 (fig. 5 or 6) for indication of .5 milliampere on panel meter (R). 23. Power Supply (Model 332B) a. Performance Check NOTE Do not perform power supply checks if all other parameters are within tolerance. WARNING Dangerous potentials exist between chassis and ground. Exercise extreme caution. (1) Connect voltmeter (A9) to MASTER REF TEST points (fig. 5) (2) Position TI controls as listed in (a) through (g) below: (a) METER switch to VOLTAGE. (b) VOLTAGE RANGE switch to 1000. (c) Voltage dials to 00X.0000. (d) VOLTAGE TRIP switch to 1000. (e) VERNIER control fully clockwise. (f) CURRENT LIMIT control fully clockwise. (g) POWER switch to OPR. 33

TB 9-4931-383-50 below. (3) If voltmeter does not indicate between 6.01999 and 6.02001 volts dc, perform b

b. Adjustments. Adjust R9, MASTER REF ADJUST (fig. 5) for an indication of 6.02000 volts dc on voltmeter (R) 24. Power Supply (Model 332B/AF) a. Performance Check NOTE Do not perform power supply check if all other parameters are within tolerance. (1) Connect equipment as shown in figure 1, except connect TI from MASTER REF TEST points (fig. 6), observing polarity. (2) Set voltage divider (A7) to .0666667. (3) Set dc transfer standard (A2) for 1 V mean output. (4) Position TI controls as listed in (a) through (g) below: (a) METER switch to VOLTAGE. (b) VOLTAGE RANGE switch to 1000. (c) Voltage dials to 00X.0000. (d) VOLTAGE TRIP switch to 1000. (e) VERNIER control fully clockwise. (f) CURRENT LIMIT control fully clockwise. (g) POWER switch to OPR. (5) If null detector (A4) does not indicate null, perform b below. b. Adjustments. Adjust R9 REF VOLTAGE ADJUST (fig. 6) for a null indication on null detector (R). 25. Final Procedure a. Deenergize and disconnect all equipment. b. In accordance with TM 38-750, annotate and affix DA Label 80 (US Army Calibration System). When TI cannot be adjusted within tolerance, annotate and affix DA Form 2417 Unserviceable or Limited Use) tag.

34

TB 9-4931-383-50 By Order of the Secretary of the Army: FRED C. WEYAND General, United States Army Chief Of Staff Official: PAUL T. SMITH Major General, United States Army The Adjutant General Distribution: To be distributed in accordance with Std. IDS No. RLC-1500, 13 March 1974.

PIN NO: 009048-000