HP 431b, 431c schematic

TB 9-6625-086-35

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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 Page 7, paragraph 12a(2) is superseded as follows;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 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 Page 9, paragraph 15b is superseded as follows: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). 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

PIN: 010318-002

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

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TB 9-6625-086-35, 12 December 1975, is changed as follows: Page 5, paragraph 10a(3) is superseded as follows: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 Page 8, figure 4 is superseded as follows:

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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 Page

SECTION I. IDENTIFICATION AND DESCRIPTION

Test instrument identification............................ 1 2

Calibration data card, DA Form 2416................ 2 2

Calibration description....................................... 3 2

II. EQUIPMENT REQUIREMENTS

Equipment required ........................................... 4 2

Accessories required........................................... 5 3

III. PRELIMINARY OPERATIONS

Preliminary instructions .................................... 6 4

Equipment Setup................................................ 7 4

IV. CALIBRATION PROCESS

Coarse null.......................................................... 8 5

Zero and vernier................................................. 9 7

Range and tracking check with power meter

calibrator.......................................................... 10 7

Range and tracking without power meter

calibrator.......................................................... 11 9

Oscillator frequency............................................ 12 11

Power supply ...................................................... 13 12

Final procedure................................................... 14 13

_____________

*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.

Table 1. Calibration Description

Test instrument parameters Performance specifications Zero carryover Less than 0.5% of FS when zeroed on most sensitive scale Range 0.01 to 10 mw in 7 ranges: -20 to +10 dBm in 5 -dBm steps Accuracy Model 431C

From +20°C to +35°C - .01 mw range, ±2% of FS, .03 mw range, ±1.5% of

FS; all other ranges, ±1% of FS. From 0°C to +55°C, ±3% of FS on all ranges. Model 431B From +20°C to +35°C, ±3% of FS on all ranges. From 0°C to +55°C, ±5% 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.

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