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DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
POWER METER, HEWLETT-PACKARD,
MODELS 431B AND 431C (AN/USM-260)
Headquarters, Department of the Army, Washington, DC
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Page 7, paragraph 12a(2) is superseded as follows;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 kΩ. This 10 kΩ 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Page 9, paragraph 15b is superseded as follows: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).
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:
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.
TB 9-6625-086-35
CALIBRATION PROCEDURE FOR
2 August 1985
When the TI receives limited or special calibration,
US GOVERNMENT PRINTING OFFICE: 1985 - - 544-007/20156 Region #4
JOHN A. WICKHAM, JR.
General, United States Army
Chief of Staff
Change 2
PIN: 010318-002
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Summary of Contents for HP 431B
- Page 1 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.”...
- Page 2 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...
- Page 3 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.
- Page 4 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...
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Page 6: Calibration Description
IDENTIFICATION AND DESCRIPTION This bulletin provides instructions for the 1. Test Instrument Identification. 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. - Page 7 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.
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Page 8: Section Iii Preliminary Operations
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. -
Page 9: Section Iv Calibration Process
(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. - Page 10 TB 9-6625-086-35 Figure 1. Right interior view - model 431C.. Figure 2. Top interior view - model 431B.
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Page 11: 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. - Page 12 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.
- Page 13 (9) Reconnect the 200-ohm thermistor mount to the TI and set the MOUNT RES to 200Ω. 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.
- Page 14 Table 5. Range and tracking Performance Check (Without Power Meter Calibrator) 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...
- Page 15 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.
- Page 16 (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.
- Page 17 (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.
- Page 18 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.