HP 431B Manuel

PIN: 010318-002

TB 9-6625-086-35

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Page 7, paragraph 12a(2) is superseded as follows;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 kΩ. This 10 kΩvalue 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Page 9, paragraph 15b is superseded as follows: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

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Page 5, paragraph 10a(3) is superseded as follows: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Page 8, figure 4 is superseded as follows: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.

PIN NO: 010318-001

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

_____________

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

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

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.

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

Item Common name Minimum use

specifications Manufacturer and model

(part number)

Transfer

(6625-00-621-

7877)

Maintenance

(AN/TSM-55) Maintenance

(4931-00-525-

8175)

A1 AUTOTRANSFORMER Range:105 to 125 V ac

General Radio,

Model

W10MT3AS3

(7910809)

TS 510/U General Radio,

Model

W10MT3AS3

(7910809)

A2 DC POWER SUPPLY1Range:0 to 25 vdc TS 2734/U John Fluke,

Model 760A

A3 DC VOLTMETER Range:0 5 to 25 vdc

Accuracy: ±0.05%

Dana, Model

5703-S-2127

(7912606)

John Fluke,

Model 882AB

(TS-2843/U)

Hewlett-

Packard, Model

3490A

A4 FREQUENCY

COUNTER Range:9950 to 10,275

Accuracy: ±0.025%

Systron-

Donner

Model 1037-

M (7910823)

(P/O

7910628)

AN/USM-

257A Hewlett-

Packard, Model

5245L

A5 POWER METER

CALIBRATOR Range:0.01 to 10 mw

Accuracy: ±0.25%

Hewlett-

Packard

8402B

(7911026)

AN/USM-317

A6 RESISTANCE1

DECADE Range:1 k ohm

Accuracy: ±0.05% Biddle-Gray,

Model 71-631

(7910328)

A7 RESISTANCE1

DECADE Range:10 k ohm

Accuracy: Nominal CMC, Model

240C (7907234)

A8 THERMISTOR

MOUNT Range:10 MHz to 12.4

GHz

Accuracy: ±5%

10 MHz to 10 GHz

Hewlett-

Packard,

Models

478A

(7910461)

MX-7772/U Hewlett-

Packard, Model

478A (7910461)

8.2 to 12.4 GHz

X486A

(7910460) Hewlett-

Packard,

Model X486A

1Not used if power meter calibrator (A5) is available.

Table 3. Accessories Required

Item Common name Description and Part Number

B1 Adapter Double banana jack to BNC plug (7909401)

B2 Adapter Double banana jack to phone plug (7907566)

B3 Cable124-in., single banana plug terminations (red) (7907497)

B4 Cable124-in., single banana plug terminations (black) (7907498)

B5 Cable 36-in., BNC plug to alligator clips (7909410)

B6 Termination 50-ohm, N jack (374 NM)

1Three required when using maintenance standard set 4931-00-525-8175.

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

cabove.

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 cand dabove.

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.

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 8through 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 bbelow.

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.

TB 9-6625-086-35

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

Figure 2. Top interior view - model 431B.

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