TB 9-6625-1997-35
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Distortion .......................................................
Modulation deviation...........................................
Power supply......................................................
Final procedure ..................................................
IDENTIFICATION AND DESCRIPTION
calibration of Signal Generator AN/URM-103 (SG-297/U). TM's 11-6625-586-12 and 11-
6625-586-45 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. Slight internal differences occur but they do not affect
calibration. All models are constructed per military specifications.
b. Time and Technique. The time required for this calibration is approximately 6
hours, using the dc and low frequency technique.
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).
pertain to this calibration are listed in table 1.
Test instrument parameters
Performance specifications
RF frequency
Range:
18 to 80 MHz
Accuracy: 0.5% at any point on frequency dial,
0.00375% at 1 MHz increments using
calibrator
0.05 V to 10 mVrms, continuously variable
RF voltage
Range:
switch selectable fixed output levels of 62.5,
125, 250, and 500 mVrms
Accuracy: 15% from 0.1 V to 10 mVrms
25% from 62.5 to 500 mVrms
Internal modulation
Switch selectable internal modulating frequencies
of 150 1 Hz, 400 Hz 5 Hz, and 1 kHz 50 Hz
2 CHANGE 1
