TB 9-6625-086-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Power Meter, Hewlett-Packard Model 431C (AN/USM-260).
The
manufacturer's 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. Forms, Records, and Reports
a. Forms, records, and reports required for calibration personnel at all levels are
prescribed by TB 750-25.
b. Adjustments to be reported are designated (R) at the end of the sentence in which
they appear. When adjustments are in tables, the (R) follows the designated adjustment.
Report only those adjustments made and designated with (R).
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
From +20 C to +35 C - .01 mW range, 2% of FS, .03 mW range, 1.5%
Accuracy
of FS; all other ranges, 1% of FS
From 0 C to +55 C, 3% of FS on all ranges
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with the secondary transfer calibration
standards sets AN/GSM-287 or AN/GSM-705. Alternate items may be used by the
calibrating activity. 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
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.
5. Accessories Required. The accessories required for this calibration are common
usage accessories, issued as indicated in paragraph 4 above, and are not listed in this