TB 9-6625-2077-35
SECTION I
IDENTIFICATION AND DESCRIPTION
This bulletin provides instructions for the
calibration of Signal Generator, SG-1144/U. TM 11-6625-2954-14&P 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. On some models, the highest TUNING RANGE switch is
designated (16-80 MHZ) instead of 16-90 MHz. This is shown in parenthesis throughout
test.
b. Time and Technique. The time required for this calibration is approximately 3
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
Frequency
Range: 50 kHz to 90 MHz (80 MHz)
Accuracy: 1% indication
Range: 100 nV to 1 V into 50Ω load
Output voltage1
Accuracy: 1 dB, 1 V to 1 V
2 dB, 100 nV to 1 V1
Frequency modulation:
Internal tones
Range: 150, 400, and 1000 Hz
Accuracy: 150 1 Hz, 400 5 Hz, 1 kHz 50 Hz
Deviation
Range: 0 to 75 kHz from 20 to 80 Mhz
Accuracy: 15% indication
Distortion
<4%
Amplitude modulation:
Internal tones
Range 0 to 100% at 400 and 1000 Hz
Accuracy: 6%
Distortion
<1% at 0 to 50%
<3% at 50 to 90%
1
Not checked below -110 dB (.707 V).
