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Change 2 DEPARTMENT OF THE ARMY TECHNICAL BULLETIN CALIBRATION PROCEDURE FOR POWER METER, HEWLETT-PACKARD, MODELS 431B AND 431C (AN/USM-260)
Headquarters, Department of the Army, Washington, DC 2 August 1985 TB 9-6625-086-35, 12 December 1975, is changed as follows: Page 1, paragraph 2. In lines 4 and 5, change "TM 38-750" to read "750-25." Paragraph 3. In lines 7 and 8, changes address to read "Commander, US Army TMDE Support Group, ATTN: AMXTM-LPP, Redstone Arsenal, AL 35898-5400." Page 7, paragraph 12a(2) is superseded as follows; (2) Set resistance decade (A7) to 10 k. This 10 k value can be decreased as necessary to obtain full-scale indication on TI. Page 9, paragraph 15b is superseded as follows: b. When all parameters are within tolerance, annotate and affix DA Label 80 (US Army Calibration Instrument). When the TI receives limited or special calibration, annotate and affix DA Label 163 (US Army Limited or Special Calibration). When the TI cannot be adjusted within tolerance, repair the TI in accordance with the maintenance manual. When repair is delayed for any reason or the TI cannot be repaired with local resources, annotate and affix DA Form 2417 (US Army Calibration System Rejected Instrument) and inform the owner/user accordingly in accordance with TB 750-25. By Order of the Secretary of the Army: JOHN A. WICKHAM, JR. General, United States Army Chief of Staff Official: DON J. DELANDRO Brigadier General, United States Army The Adjutant General Distribution: To be distributed in accordance with DA Form 12-34C, Block No. 319, requirements for calibration publications.
US GOVERNMENT PRINTING OFFICE: 1985 - - 544-007/20156 Region #4

TB 9-6625-086-35

PIN: 010318-002

TB 9-6625-086-35
Change 1 DEPARTMENT OF THE ARMY TECHNICAL BULLETIN CALIBRATION PROCEDURE FOR POWER METER, HEWLETT-PACKARD MODELS 431B AND 431C (AN/USM-260)
Headquarters, Department of the Army, Washington, DC 29 August 1977 TB 9-6625-086-35, 12 December 1975, is changed as follows: Page 5, paragraph 10a(3) is superseded as follows: (3) Position the TI RANGE switch to the .01 MW position and adjust the zero controls for 0.00 V dc on the dc voltmeter. Page 8, figure 4 is superseded as follows:

Figure 4. Range and tracking check without power meter calibrator.

By Order of the Secretary of the Army: BERNARD W. ROGERS 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 DA Form 12-34A, Requirements for Calibration Procedures.

U.S. GOVERNMENT PRINTING OFFICE: 1977-765010/180

PIN NO: 010318-001

TB 9-6625-086-35
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN

CALIBRATION PROCEDURE FOR POWER METER, HEWLETT-PACKARD MODELS 431B AND 431C (AN/USM-260)
Headquarters, Department of the Army, Washington, DC 12 December 1975
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 256-842-2313). A reply will be furnished directly to you. Paragraph 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Page 2 2 2 2 3 4 4 5 7 7 9 11 12 13

SECTION

I.

II.

III.

IV.

IDENTIFICATION AND DESCRIPTION Test instrument identification............................ Calibration data card, DA Form 2416 ................ Calibration description ....................................... EQUIPMENT REQUIREMENTS Equipment required ........................................... Accessories required ........................................... PRELIMINARY OPERATIONS Preliminary instructions .................................... Equipment Setup................................................ CALIBRATION PROCESS Coarse null.......................................................... Zero and vernier ................................................. Range and tracking check with power meter calibrator.......................................................... Range and tracking without power meter calibrator.......................................................... Oscillator frequency............................................ Power supply ...................................................... Final procedure...................................................

_____________ *This bulletin supersedes TB 9-6625-086--35, 31 December 1974.

TB 9-6625-086-35

SECTION I IDENTIFICATION AND DESCRIPTION 1. Test Instrument Identification. This bulletin provides instructions for the calibration of Power Meter, Hewlett-Packard Models 431B and 431C (AN/USM-260). The manufacturer's instruction manual was 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. Variations among models are described in text. b. Time and Technique. The time required for this calibration is approximately 1 hour, using the microwave or dc low technique. 2. Calibration Data Card, DA Form 2416. Forms, records, and reports required for calibration personnel at all levels are prescribed by TB 750-25. DA Form 2416 must be annotated in accordance with T750-25 for each calibration performed. 3. Calibration Description. TI parameters and performance specifications which pertain to this calibration are listed in table 1.
Test instrument parameters Zero carryover Range Accuracy Table 1. Calibration Description Performance specifications Less than 0.5% of FS when zeroed on most sensitive scale 0.01 to 10 mw in 7 ranges: -20 to +10 dBm in 5 -dBm steps Model 431C From +20°C to +35°C - .01 mw range, ą2% of FS, .03 mw range, ą1.5% of FS; all other ranges, ą1% of FS. From 0°C to +55°C, ą3% of FS on all ranges. Model 431B From +20°C to +35°C, ą3% of FS on all ranges. From 0°C to +55°C, ą5% of FS on all ranges.

SECTION II EQUIPMENT REQUIREMENTS 4. Equipment Required. Table 2 identifies the specific equipment used in this calibration procedure. This equipment is issued with the secondary transfer calibration standards sets 6695-00-621-7877 and 4931-00-525-8175 and maintenance calibration shelter AN/TSM-55. 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. The 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 actual accuracy of the equipment selected is shown in parenthesis. 2

TB 9-6625-086-35 5. Accessories Required. The accessories listed in table 3 are issued with the secondary transfer calibration standards sets 6695-00-621-7877 and 4931-00-525-8175 and maintenance calibration shelter AN/TSM-55. When necessary, these items may be substituted by equivalent items unless specifically prohibited.
Table 2. Minimum Specifications of Equipment Required Minimum use Manufacturer and model Common name specifications (part number) Transfer Maintenance Maintenance (6625-00-621(AN/TSM-55) (4931-00-5258175) 7877) General Radio, AUTOTRANSFORMER Range: 105 to 125 V ac General Radio, TS 510/U Model Model W10MT3AS3 W10MT3AS3 (7910809) (7910809) DC POWER SUPPLY1 Range: 0 to 25 vdc TS 2734/U John Fluke, Model 760A DC VOLTMETER Range: 0 5 to 25 vdc Dana, Model John Fluke, Hewlett5703-S-2127 Model 882AB Packard, Model Accuracy: ą0.05% (7912606) (TS-2843/U) 3490A FREQUENCY Range: 9950 to 10,275 SystronAN/USMHewlettCOUNTER Hz Donner 257A Packard, Model Model 10375245L Accuracy: ą0.025% M (7910823) (P/O 7910628) POWER METER Range: 0.01 to 10 mw HewlettAN/USM-317 CALIBRATOR Packard Accuracy: ą0.25% 8402B (7911026) RESISTANCE1 Range: 1 k ohm Biddle-Gray, DECADE Model 71-631 Accuracy: ą0.05% (7910328) RESISTANCE1 Range: 10 k ohm CMC, Model DECADE Accuracy: Nominal 240C (7907234) THERMISTOR Range: 10 MHz to 12.4 HewlettMOUNT GHz Packard, Models MX-7772/U HewlettAccuracy: ą5% 478A Packard, Model 10 MHz to 10 GHz (7910461) 478A (7910461) 8.2 to 12.4 GHz X486A Hewlett(7910460) Packard, Model X486A

Item

A1

A2 A3 A4

A5

A6 A7 A8

1Not

used if power meter calibrator (A5) is available.

Item B1 B2 B3 B4 B5 B6
1Three

Common name Adapter Adapter Cable1 Cable1 Cable Termination

Table 3. Accessories Required Description and Part Number Double banana jack to BNC plug (7909401) Double banana jack to phone plug (7907566) 24-in., single banana plug terminations (red) (7907497) 24-in., single banana plug terminations (black) (7907498) 36-in., BNC plug to alligator clips (7909410) 50-ohm, N jack (374 NM)

required when using maintenance standard set 4931-00-525-8175.

3

TB 9-6625-086-35 SECTION III PRELIMINARY OPERATIONS 6. Preliminary Instructions a. The instructions outlined in this section 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 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. 7. Equipment Setup a. Connect autotransformer (A1) to the power source and adjust for 115 volts ac. CAUTION Throughout this procedure, make sure the TI is deenergized while connecting or disconnecting a thermistor mount or when repositioning the MOUNT RES switch. b. Connect the TI to autotransformer. c. Adjust the TI mechanical zero setscrew clockwise until the pointer is left of zero, moving up scale. Stop when the pointer indicates zero. NOTE If pointer overshoots zero indication during adjustment, repeat c above. d. Adjust the zero setscrew approximately 15 degrees counterclockwise to free the setscrew from the meter movement. e. If the pointer moves while freeing the setscrew, repeat c and d above. f. Connect 200-ohm thermistor mount (A8) to the TI, using cable furnished with the TI and terminate the mount with coaxial termination (B6). g. On model 431C, set the CALIB FACTOR PERCENT switch to 100 and leave it in this position for the remainder of the procedure. 4

TB 9-6625-086-35 SECTION IV CALIBRATION PROCESS 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 When indications specified in paragraphs 8 through 11 are not within tolerance, perform the oscillator frequency check in paragraph 12 and the power supply check in paragraph 13 before making adjustments. Do not perform the procedures in paragraphs 12 and 13 if all other parameters are within tolerance. NOTE Remove top and side covers from the TI only for adjustment. When adjustment is completed, reinstall the covers. 8. Coarse Null a. Performance Check (1) Position the TI RANGE switch to the .01 MW position. (2) Adjust the TI ZERO controls for a 25 to 75 percent indication on the TI meter. (3) Turn the RANGE switch to NULL. (4) Adjust the NULL, control for minimum indication on the TI meter. (5) Repeat (2) through (4) above until the TI meter pointer is within the NULL region. If the meter pointer does not indicate within the NULL region, perform b below. NOTE During maintenance calibration, if a 100-ohm thermistor mount is not available, disregard (6) through (8) below. (6) Connect 100-ohm thermistor mount (A8) to the TI. (7) Set the TI MOUNT RES switch to 100. (8) Repeat (2) through (5) above. b. Adjustments. On model 431C, adjust L1 (fig. 1)(L102, fig. 2 on model 431B) for null on the TI. 5

TB 9-6625-086-35

Figure 1. Right interior view - model 431C..

Figure 2. Top interior view - model 431B.

6

TB 9-6625-086-35 9. Zero and Vernier a. Performance Check (1) On model 431C, connect dc voltmeter (A3) to the TI DVM output (rear panel) using adapter (B1) and if necessary cables (B3) and (B4). (2) On model 431B, connect resistance decade (A6)(set at 1000 ohms) to the TI RECORDER output, using adapter (B2) and cables (B3 and B4). Connect the dc voltmeter to the same terminals of the resistance decade, using cables (B3 and B4) if necessary. (3) Position the TI RANGE switch to the .01 MW position and adjust the zero controls for 0.00 volt dc on the dc voltmeter. (4) Turn the TI RANGE switch to .03-, .1-, .3-, l-, 3-, and 10-MW positions while observing dc voltmeter. If the dc voltmeter does not indicate between -0.01 and +0.01 volt in each position of the RANGE switch, perform b below. b. Adjustments. On model 431C, adjust R37 (fig. 1) for 0.00 ą.01 volt on the dc voltmeter at each RANGE switch setting. No adjustment can be made on model 431B. NOTE Perform paragraph 10 below if power meter calibrator (A5) is available as a standard. If a power meter calibrator is not available, omit paragraph 10 and proceed to paragraph 11. 10. Range and Tracking Check with Power Meter Calibrator a. Performance Check (1) Connect 200-ohm thermistor mount (A8) to the TI. (2) Position the controls of power calibrator (A5) as follows: (a) FUNCTION switch to CURRENT OFF. (b) MOUNT RESISTANCE to correspond with the resistance of the thermistor mount being used. (c) CURRENT and VERNIER fully counterclockwise. (3) Connect the POWER METER terminals of the power meter calibrator to the DC CALIBRATION terminals (rear panel) of the TI, using cables (B3 and B4). (4) Set the TI MOUNT RES switch to 200. (5) Set the TI RANGE switch to the .01 MW position and null and zero the meter. 7

TB 9-6625-086-35 (6) Position the controls of the power meter calibrator as follows: (a) RANGE (MW) switch to .01. (b) FUNCTION switch to CAL. NOTE After each change in position of TI RANGE switch, turn the FUNCTION switch of power meter calibrator to the CURRENT OFF position and adjust the TI zero controls for a zero indication. (7) Turn the TI and power meter calibrator RANGE switches to the settings listed in table 4. If the indications are not within limits specified, perform b below.
Table 4. Range and Trucking Performance Check (with Power Meter Calibrator) Test Instrument Indications (mw) Power Meter (Readings for Model 431B Adjustments for Model Test Instrument Calibrator are in parenthesis) 431C (fig. 3) RANGE switch RANGE (MW) Min Max 200-Ohm 100-Ohm settings switch settings Mount Mount .01 .01 0.0098 0.0102 R14 R1 (0.0097) (0.0103) .03 .03 0.0295 0.0305 R13 R2 (0.0291) (0.0309) .1 .1 0.099 0.101 R12 R3 (0.097) (0.103) .3 .3 0.297 0.303 R11 R4 (0.291) (0.309) 1 1 0.990 1.010 R10 R5 (0.970) (1.030) 3 3 2.970 3.030 R9 R6 (2.910) (3.090) 10 10 9.900 10.100 R8 R7 (9.700) (10.300) 101 8 7.9 8.1 (7.7) (8.3) 10 6 5.9 6.1 (5.7) (6.3) 10 4 3.9 4.1 (3.7) (4.3) 10 2 1.9 2.1 (1.7) (2.3)

8

TB 9-6625-086-35 (8) Repeat (1) through (7) above with 100 ohm thermistor mount (A8) connected to the TI and with the TI MOUNT RES switch set to 100. (9) Reconnect the 200-ohm thermistor mount to the TI and set the MOUNT RES to 200. b. Adjustments. Adjust the appropriate potentiometer, R1 through R14 (fig. 3), to the mean value. No adjustment can be made on model 431B.

Figure 3. Left interior view, model 431C.

11. Range and Tracking Check Without Power Calibrator a. Performance Check (1) Connect the equipment as shown in figure 4. (2) Set resistance decade (A7) to 10 k. This 10 k value can be decreased as necessary to obtain full scale indication on TI. (3) Set resistance decade (A6) to 1000 ohms.

9

TB 9-6625-086-35 used. (4) Set the TI MOUNT RES switch to agree with the thermistor mount (A8) being (5) Set the TI RANGE switch to .01 MW and null and zero the meter. (6) Adjust dc power supply (A2) for a full-scale (.01 mw) indication on the TI. If dc voltmeter (A3) indication is not within the limits specified in table 5, perform b below.

Figure 4. Range and tracking check without power meter calibrator. Table 5. Range and tracking Performance Check (Without Power Meter Calibrator) Test Dc Voltmeter Indications (vdc) (Readings Adjustments for Model Instrument for Model 431B are in Parenthesis) 431C (fig. 3) Indication 200-Ohm Mount 100-Ohm Mount 200-Ohm 100-Ohm Min Max Min Max Mount Mount .01 .438 .456 .619 .645 R14 R1 (.434) (.460) (.613) (.651) .03 .763 .787 1.08 1.12 R13 R2 (.752) (.798) (1.06) (1.13) .1 1.40 1.42 1.98 2.02 R12 R3 (1.37) (1.45) (1.94) (2.06) .3 2.43 2.47 3.43 3.49 R11 R4 (2.38) (2.52) (3.36) (3.56) 1 4.43 4.51 6.26 6.38 R10 R5 (4.34) (4.60) (6.13) (6.51)

Test Instrument Switch Settings .01 .03 .1 .3 1

10

TB 9-6625-086-35
Table 5. Range and tracking Performance Check (Without Power Meter Calibrator) - Continued Test Test Dc Voltmeter Indications (vdc) (Readings Adjustments for Model Instrument Instrument for Model 431B are in Parenthesis) 431C (fig. 3) Switch Indication 200-Ohm Mount 100-Ohm Mount 200-Ohm 100-Ohm Settings Min Max Min Max Mount Mount 3 3 7.67 7.83 10.84 11.06 R9 R6 (7.52) (7.98) (10.6) (11.3) 10 10 14.00 14.28 19.80 20.20 R8 R7 (13.7) (14.6) (19.4) (20.6) 10 8 12.52 12.78 17.71 18.07 (12.3) (13.0) (17.4) (18.4) 10 6 10.84 11.06 15.34 15.64 (10.6) (11.3) (15.0) (16.0) 10 4 8.85 9.03 12.52 12.78 (8.67) (9.21) (12.3) (13.0) 10 2 6.26 6.38 8.85 9.03 (6.13) (6.51) (8.67) (9.21)

NOTE Each time the TI RANGE switch is changed, turn the dc power supply off and zero the TI meter. (7) Repeat the technique in (5) and (6) above for the remaining positions of the TI RANGE switch. If both a 200-ohm and 100-ohm thermistor mount is available, perform (1) through (6) above for both mounts. b. Adjustments. Adjust R1 through R14 (fig. 3) as appropriate for model 431C. No adjustment can be made on model 431B. 12. Oscillator Frequency NOTE Do not perform the oscillator frequency check if all parameters in paragraphs 8 through 11 above are within tolerance. a. Performance Check (1) On model 431C, connect frequency counter (A4) to the positive end of C18 (fig. 1) and ground, using cable (B4). On model 431B, connect the counter to the positive end of C125 (fig. 2) and ground. (2) Connect 200-ohm thermistor mount (A8) to the TI and terminate the mount with termination (B6). (3) Set the TI MOUNT RES switch to 200. (4) If the frequency counter does not indicate between 9,990 and 10,010 Hz for model 431C, perform b(1) below. For model 431B, if the frequency counter does not indicate between 10,025 and 10,275 Hz, perform b(2) below.

11

TB 9-6625-086-35 NOTE Perform (5) through (7) below if the TI is to be used with a 100ohm thermistor mount. (5) Disconnect the 200-ohm thermistor mount from the TI. (6) Connect 100-ohm thermistor mount (A8) to the TI and turn the MOUNT RES switch to 100. (7) The frequency counter will indicate between 9,950 and 10,050 Hz. b. Adjustments (1) Adjust L2 (fig. 1) on model 431C. (2) Adjust L101 (fig. 2) on model 431B. 13. Power Supply a. Performance Check NOTE Do not perform the power supply check if all other parameters are within tolerance. (1) Connect dc voltmeter (A3) to pin W of terminal board XA2 (fig. 5) and ground. For model 431B, connect the voltmeter to the negative end of C6 (fig. 2) and ground.

Figure 5. Top internal view-model 431C.

12

TB 9-6625-086-35 (2) If the dc voltmeter does not indicate between -17.98 and -18.02 volts dc, perform b below. (3) Vary the output of autotransformer (A1) between 105 and 125 volts ac. The dc voltmeter indication will remain within the limits specified in (2) above. (4) Adjust the autotransformer for a 115-volt ac output. b. Adjustments. Adjust R36 (fig. 3) for model 431C or R13 (fig. 2) for model 431B. 14. Final Procedure a. Deenergize and disconnect all equipment and replace TI protective cover. b. When all parameters are within tolerance, annotate and affix DA Label 80 (US Army Calibrated Instrument). When the TI receives limited or special calibration, annotate and affix DA Label 163 (US Army Limited or Special Calibration). When the TI cannot be adjusted within tolerance, repair the TI in accordance with the maintenance manual. When repair is delayed for any reason or the TI cannot be repaired with local resources, annotate and affix DA Form 2417 (US Army Calibration System Rejected Instrument) and inform the owner/user accordingly in accordance with TB 750-25.

13

TB 9-6625-086-35 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 DA Form 12-34C, Block No. 319, requirements for calibration publications.

US GOVERNMENT PRINTING OFFICE: 1975 - - 641-219-5023

PIN: 010318-000