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 TM 11-6625-922-15
Step
Condition
Requirement
4
Use Frequency Meter AN/TSM-16 to measure
AN/TSM-16 should read 25 Hz.
the frequency of the square wave at pin
R of delay logic assembly A9; operate
MODULATION FREQUENCY HZ
switch to 25.
5
Operate the MODULATION FREQUENCY
AN/TSMA-6 should read 83-1/3 Hz.
HZ switch to 83-1/3.
6
Operate the MODULATION FREQUENCY
AN/TSM-16 should read 250 Hz.
HZ switch to 250.
7
Operate the SWEEP TIME control to 1 SEC.
The observed time should be about 1 second or less.
Adjust SWEEP WIDTH control so that the
most negative voltage at TP1 of sweep
drive assembly A16 is approximately -9 to
-10 volts. Note the time it takes for the
signal at TP1 to go from the most negative
to the most positive voltage.
8
Operate the SWEEP TIME control to 2 MIN.
The observed time should be 2 minutes or more.
Note the time it takes for the signal at TP1
of sweep drive assembly A16 to go from
the most negative to the most positive
voltage.
9
Operate the RANGE (KHZ) switch to .1
Frequency range should be less than 300 Hz.
-50. Set a carrier frequency of approximately
5 kHz. Operate the SWEEP-CARRIER
REFERENCE switch to SWEEP, SWEEP
CALIBRATE switch to SWEEP, SWEEP
WIDTH control to .3 KHZ, and SWEEP
TIME control to a convenient setting for
observation. Monitor the range of the sweep
frequency on the FREQUENCY display.
10 Operate the SWEEP WIDTH control to
Frequency range should be more than 12.5 kHz.
12.5 KHz. Monitor the range of the sweep
frequency on the FREQUENCY display.
11 Operate the SWEEP-CARRIER-REFERENCE
Number in FREQUENCY display should be 1/10th
switch to CARRIER, and COUNTING
1 digit of previous display.
TIME switch to 10 SEC. Check to see that
the number in the FREQUENCY display
is about 50000. Operate COUNTING
TIME switch to 1 SEC.
12 Operate COUNTING TIME switch to .1
Number should be 1/10th 1 digit of setting in 1
SEC.
SEC position.
13 Turn % MOD ADJ fully clockwise, then
Dbm/% MODULATION meter should read between
fully counterclockwise. Note the percent
0 and at least 50. AN/USM-182 should show
modulation reading on the dbm/% MODU-
carrier signal with 50-percent modulation.
LATION meter and monitor either TRANS-
MIT jack output signal with Oscilloscope
AN/USM-182.
14 Connect leads of Multimeter AN/USM-223
between rear panel analog delay output ter-
minal (fig. 3-2) and ground. Set up con-
trols and jumper cable (para 4-4, 11ac, ae).
Operate DELAY METER RANGE MS
switch to .15 - .5, COARSE DELAY MS to
0, and FINE DELAY MS to 0.
a. Operate DELAY ZERO ADJ control to
a. AN/USM-223 will read approximately -0.05 volt.
obtain DELAY meter indication of 0
(black 0 - .5 scale).
b. Operate DELAY ZERO ADJ control
b. AN/USM-223 will read approximately +0.05 volt.
slowly cw until DELAY meter indication
is .5 (Black 0 - .5 scale).
6-5
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