TM 11-6625-3059-10
Section II. Equipment Description
DESCRIPTION
FM/AM Modulation Meter M E-525AIUSM provides automatic (AUTO) tuning, leveling, and modulation display of AM
and FM signals. Manual tuning and leveling is also possible using an external (EXT) signal using front panel controls and
controls of the external signal source.
Automatic and Manual Operation. The highest amplitude radio frequency(rf) carrier in the frequency range of 10
megahertz (MHz) to 1.2 gigahertz (GHz) is automatically tuned (or manually acquired by adjustment of equipment
used for external input) and normalized in level to produce a 1.0 MHz intermediate frequency (if.) signal identical to
the input rf carrier (AM or FM modulated). The modulating signal is detected, filtered, measured and then displayed
on the digital display in percent of AM modulation or kilohertz of FM deviation.
Detectors. Pushbutton switches select displays of positive or negative peak modulation or peak average, each in
three ranges for FM and AM.
Audio Filters. Four high and four low pass filters and four de-emphasis networks provide the means for bandpass
simulation of most communications systems. The 6 decibel per octave (6 dB/OCT) pushbutton de-emphasis switch
relates phase deviation to the frequency deviation displayed.
EQUIPMENT DATA
Weight and Dimensions
Weight
14 lbs. (63.5 kg)
Length
15.72 in. (399.3 mm)
Width
13.68 in. (347.5 mm)
Height
6.36 in. (111.5 mm)
Data Plate
1-2
