TB 9-6625-1998-35
SECTION I
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Signal Generator, AN/URM-127 (SG-377/U) and AN/URM-127A (SG-377A/U).
TMs 11-6625-683-14 and 11-6625-2725-14&P 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 within the text.
b. Time and Technique. The time required for this calibration is approximately 2
hours, using the dc and low frequency technique.
2. Forms, Records, and Reports
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.
Table 1. Calibration Description
Test instrument
parameters
Performance specifications
Frequency
Range: 20 Hz to 200 kHz
Accuracy: 2% indication
Output voltage
Range: 10 V ac
Accuracy: -30% to +20% FS
Range: 100 V to 10 V ac
Accuracy: 5% FS
Distortion1
1% maximum (AN/URM-127)
2% maximum (AN/URM-127A)
Frequency meter (AN/URM-127 only)
60 and 400 Hz l %
1Standard
limited not checked above 100 kHz.
2
