TB 9-6625-2079-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of AM-FM Modulation Meter, Boonton, Model 82AD, 82AD/S10, ME-525A,
ME-525A/USM, and ME-525U. The manufacturer's manual and TM 11-6625-3059-24 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. None.
b. Time and Technique. The time required for this calibration is approximately 3
hours, using the microwave 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
Input sensitivity
Range:
<10 mV rms (10 to 520 MHz)
Accuracy:
<30 mV rms (520 MHz to 1.2 GHz)
Dc output
Range:
1.00 V dc at 1000 counts on digital display
0.1%
Accuracy:
Frequency modulation
Range:
0 to 300 kHz Deviation
2% of reading (for modulation frequencies of
Accuracy:
30 Hz to 100 kHz)1
Amplitude
Range:
10 to 90%
2% of reading (for modulation frequencies of
modulation
Accuracy:
30 Hz to 100 kHz)2
Audio frequency
Range:
High Pass
Low Pass
DE-EMPHASIS
response filters
s
and shape factor
10
Hz
3
kHz
50
s
30
Hz
15
kHz
75
s
300
Hz
120
kHz
750
3000
Hz
200
kHz
6 dB/0 ct
(reference 1 kHz)
Accuracy: All filters except 10 Hz and 200 kHz are
three-pole Butterworth filters; DE-EMPHASIS
time constant and 3 dB filter frequencies have
accuracy of 4% (except 10 Hz is <3 dB).
1Procedure
limitation below 50 Hz.
2Procedure
limitation of 50 Hz to 50 kHz.