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 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 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
Deviation range
Modulating frequency range and accuracy (kHz)
(kHz)
50 Hz to 20 kHz
20 to 70 kHz
0.75 kHz
1.5 kHz
0
to
20
2
4
0
to
50
kHz
kHz
5
10
0
to
100
kHz
kHz
15
30
0
to
300
kHz
kHz
100
100
0
to 1000
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
10% of indicated value
Carrier shift accuracy
Audio output
1 V rms corresponding to 40 kHz deviation on 0 to 50 kHz range
RF oscillator
Range: 20 to 1000 MHz
Accuracy: 10%
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
