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TB 9-6625-086-35
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.
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.
pertain to this calibration are listed in table 1.
Test instrument parameters
Zero carryover
Range
Accuracy
4. Equipment Required.
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
SECTION I
IDENTIFICATION AND DESCRIPTION
TI parameters and performance specifications which
Table 1. Calibration Description
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, ±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
Table 2 identifies the specific equipment used in this
This bulletin provides instructions for the
Performance specifications
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