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Page Title:
Sectionalization Tests Using AN/UPM-137A-CONT. |
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 Control Settings
Normal Indication
Equipment under test
Procedure
Test equipment
Step
4
b. Connect AN/UMP-137A oscil-
b. None.
(Cont)
loscope VERTICAL CHAIN
A VIDEO IN jack to DET
VIDEO
jack
of
AN/APM-270(V).
c. None.
C. Adjust AN/UPM-137A oscillo-
scope controls for clear display
on CHAN A.
d. Adjust AN/UPM-137A oscillo-
d. 36 pulses present 4 pulses,
scope controls as necessary until
vacant position, and 32
one complete group of challenge
pulses.
video pulses is observed. Count
number of pulses.
e. Measure amplitude of first and
e. 10% maximum difference in
amplitude between two
last pulse and determine per
pulses.
centage of difference.
NOTE
Adjust AN/UPM-187A
oscilloscope controls.
f. 2 0.07 sec.
f. Measure spacing between lead
ing edges first and second pulses.
g. 0.5 0.24 sec.
g . Measure pulse width of first
pulse at 50% point of amplitude.
h. Set test ISLS switch to ON.
h. Fifth pulse position occupied.
Note whether a pulse, having
similar amplitude as other, oc-
cupies fifth pulse position.
i. 8 0.15 sec.
i. M e a s u r e p u l s e s p a c i n g w i t h
respect to first pulse.
j. Measure ILSL pulse width at
j. 0.5 0.1 sec.
50% point.
k. Set Test ISLS switch to OFF.
k. Pulse amplitude decreases to
low amplitude.
Note whether amplitude of fifth
pulse decreases.
a. D i s c o n n e c t c a b l e a t R F I N
5t
a. None.
Same as step 2 . . . . . . . . . . . . . . . . . .
PUSH TO TEST
jack of AN/APM-270(V) and
Continually press and release to
connect to AN/UPM-137A rf
observe specified conditions.
signal generator RF SIG GEN
IN/OUT 0.05-50W jack.
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