TB 9-5985-316-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Variable Attenuator, Tech Labs, Part Number C-8756. The MIS-35949
requirement 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. None.
b. Time and Technique. The time required for this calibration is approximately 1
hour, using the dc and low frequency technique.
2. Forms, Records, and Reports. Forms, records and reports required for calibration
personnel at all levels are prescribed by TB 750-25.
3. Calibration Description. TI parameters and performance specifications which
pertain to this calibration are listed in table 1.
Table 1. Calibration Description
Test instrument parameters
Performance specifications
Range: 0 to 10 dB dial
Frequency: Dc to 1 kHz
Accuracy: +0.6%
Frequency: 1 kHz to 1 MHz
Accuracy: +3.0%
Range: 10 to 100 dB dial
Accuracy: See table below
Test instrument
Accuracy
Frequency
dial positions
(%)
Dc to 150 kHz
10
+0.6%
1 kHz
20, 30, 40, 50
+0.6%
1 kHz
60, 80
+3.0%
1 kHz
70
+1.5%
20 kHz
20, 30, 40
+6.0%
30 kHz
20, 30, 40, 50, 60
+6.0%
Frequencies from dc to
10 to 100
+9.0%
1 MHz not listed above