TB 9-6625-862-35
IDENTIFICATION AND DESCRIPTION
This bulletin provides instructions for the
calibration of Audio Oscillators, TS-421( )/U (Data Royal, Model F370A); and Signal
Generator, Hewlett-Packard, Model 205AG. The manufacturers' manuals and
TM 11-6625-355-15-1 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 are described in text.
b. Time and Technique. The time required for this calibration is approximately 2
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
115 V ac, 10%, 60 Hz
Line voltage
Frequency
Range: 20 Hz to 20 kHz
Dial accuracy: 2%
Frequency response
Range: 20 Hz to 20 kHz
Accuracy: 1 dB from 20 Hz to 20 kHz at output levels
< + 30 dBm w/output meter reading held at + 37 dB
1.5 dB from 20 Hz to 20 kHz at output levels
≥ + 30 dBm w/output meter held at + 37 dB (reference 1 kHz)
Distortion
< 1% at frequencies above 30 Hz
Input meter
Range: -5 to +8 dBm (0 to 2 V rms)
Accuracy: 5% of FS
Input attenuator
Range: 0 to 40 dB
Accuracy: 0.1 dB
Range: 0 to 65 V ac at 600 Ω
Output meter
Accuracy: 5%
Output attenuator
Range: 0 to 110 dB
Accuracy: 05 dB, 0 to 80 dB at 1 kHz
10 dB steps
1.5 dB, 90 to 100 dB at 1 kHz
2.5 dB, 0 to 100 dB at 20 kHz
1 dB steps
0.25 dB, 0 to 10 dB at 20 kHz