TB 9-6625-2079-35
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of AM-FM Modulation Meter, Boonton, Model 82AD, 82AD/S10, ME525A,
ME525A/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.
prescribed by TB 750-25.
b. Adjustments to be reported are detonated (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
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
and shape factor
10
Hz
3
kHz
s
50
s
30
Hz
15
kHz
75
300
Hz
120
kHz
s
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.
