TB 9-6625-1918-24
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Bridge balance ......................................................
Bolometer (thermistor) mount ............................
Power supply check ..............................................
Final procedure ....................................................
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Wattmeters AN/URM-98( ), TS-779( )/U, Hewlett-Packard Models 430C and
430CR, and General Microwave Model 451: Bolometer (Thermistor) Mounts MX-2144( )/U,
and Hewlett-Packard Models 477( ). The manufacturer's manuals were used as prime data
sources 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 2
hours, using the microwave technique.
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.
Test instrument parameters
Performance specifications
Range
10 MHz to 10 GHz
Power
Range
0.01 to 10 mW
6% FS1
Accuracy
Input power
105 to 125 V ac
measurement capability certified only to 10%.
1RF