TB 9-6625-2004-35
IDENTIFICATION AND DESCRIPTION
1. Test Instrument
Identification.
This bulletin provides instructions for the
calibration of Modulation Meters ME-57/U and ME-57A/U. TM 11-6625-400-12,
TM 11-6625-400-35, and TM 11-6625-2629-14&P 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 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.
Test instrument
parameters
Performance specifications
Deviation range
Modulating frequency range and accuracy (kHz)
(kHz)
50 Hz to 20 kHz
20 to 70 kHz
0
to
20
0.75 kHz
1.5 kHz
0
to
50
2
4
kHz
kHz
0
to
100
5
10
kHz
kHz
0
to
300
15
30
kHz
kHz
0
to 1000
100
100
kHz
kHz
Modulating frequencies
50 Hz to 20 kHz with carrier frequencies of 20 to 100 MHz
Input sensitivity
0.005 V required for limiting
Carrier shift accuracy
10% of indicated value
Audio output
1 V rms corresponding to 40 kHz deviation on 0 to 50 kHz range
Range: 20 to 1000 MHz
Accuracy: 10%