TB 9-6625-1999-35
Paragraph
Page
CALIBRATION PROCESS FOR
AN/GRM-50B (SG-479B/U)
Preliminary instructions......................................
Equipment setup ..................................................
Crystal calibrator .................................................
Audio oscillator.....................................................
RF output accuracy ..............................................
Frequency output drift.........................................
Carrier zero set.....................................................
Maximum carrier and modulation zero set ........
Modulation meter accuracy .................................
RF output meter ...................................................
Modulation output distortion ..............................
Power supply ........................................................
Final procedure ....................................................
IDENTIFICATION AND DESCRIPTION
1. Test Instrument
Identification.
This bulletin provides instructions for the
The manufacturer's manual, TM 11-6625-573-14 and TM 11-6625-573-14-1 were used as
the 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, tables and figures.
b. Time and Technique. The time
required for Sections III and IV is
approximately
4 hours each, using the dc and low frequency 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.
Test instrument parameters
Performance specifications
Range: 400 and 1000 Hz
Accuracy: 5%
Carrier zero
<80 mV p-p over entire range
Crystal calibrator
Range: 100 kHz and 1 MHz
Accuracy: 0.01%