TM 11-6625-828-45
c. Procedure
Step
Control settings
No.
Test Equipment
Equipment under test
Test procedure
Performance standard
1
AN/USM-140C:
MODULATION switch to 1000~.
Vary test set 1000~ MOD control
Waveform should be without distor-
Adjust AN/USM-140C con-
IDENTIFIER switch to OFF.
Over 20 to 80 percent modulation
tion and vary in amplitude as
trols to display 1,000-cps
range as indicated by %M meter.
1000~ MOD control is adjusted.
Waveform.
Observe waveform on AN/USM-
140C.
2
AN/USM-140C:
a. MODULATION switch to 1000~.
a. Adjust test set 1000~ MOD con-
a.
None.
SWEEP; 1 second.
IDENTIFIER switch to OFF.
trol for 30 percent modulation
as indicated by %M meter.
b. MODULATION switch to 1000~.
b. Observe AN/Usm-140C display.
b.
AN/USM-140C displays between
IDENTIFIER switch to ON.
3 and 5 switching actins per
c. MODULATION switch to OMNI.
c. Observe AN/USM-140C display.
c.
AN/USM-140C displays switching
IDENTIFIER switch to ON.
Action similar to b above.
d. MODULATION switch to AMP
d. Observe AN/USM-140C display.
d.
AN/USM-140C displays switching
LOC.
Action similar to b above.
IDENTIFIER switch to ON.
e. MODULATION switch to AMP
f.
Observe AN/USM-140C DISPLAY.
f.
AN/USM-140C displays switching
LOC.
Action similar to b above.
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