TB 9-6625-2170-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Distortion Analyzer, TS-4084/G. TM 11-6625-3152-14 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 2
hours, using the dc and low frequency technique.
2. Forms, Records, and Reports
a. Forms, records, and reports required for calibration personnel at all levels are
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).
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
Common mode rejection
t50 dB at 50 to 60 Hz
Volts (dB)
Range: 200 PV to 200 V
Accuracy: r2% +1 count (r0.3 dB) 20 Hz to 20 kHz
r4% +2 counts (r0.5 dB) 10 to 20 Hz and 20 to 100 kHz
Level bandwidth
At least 300 kHz at 3 dB down (no filters selected)
Filters
Range: -3 dB at 400 Hz high pass (at least 40 dB rejection at 60 Hz)
-3 dB at 80 kHz low pass
-3 dB at 30 kHz low pass
Accuracy: r5%
A weighting: 100 Hz -19.1 r1 dB
1 kHz 0 r1 dB
10 kHz -3.5 r3 dB
Residual noise
Accuracy: d3 PV with 80 kHz and 400 Hz filters
Accuracy: d1.5 PV with A weighting filter
Distortion measurement
Fundamental frequency: 20 Hz to 20 kHz
Accuracy: r0.1%
Fundamental frequency: 10 to 20 Hz, 20 to 100 kHz
Accuracy: r0.2%
Residual THD + N
Range:
20 Hz to 20 kHz with 80 kHz filter
Distortion: d0.005% (-86 dB)
Range:
10 to 20 Hz and 20 to 100 kHz
Distortion: d0.015% (-76.5 dB)
