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Page Title:
Sectionalization Tests using AN/TPM-25A |
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 d. Sectionalization Tests using AN/TPM-25A
Control Settings
Normal
indication
Procedure
Equipment under test
Test equipment
Step
No.
1
Multimeter
FUNCTION: SYSTEM MODE: 4
Range 10V
a. None
DIRRAD: RAD ISLS: OFF
transponder test set equipment
Polarity: (+)
and permit 5 minute warmup
period.
b. C o n n e c t
b. +5 0.1 volt.
equipment
with
multimeter dc probe connected
to test point A3TP1 (fig. 5.1-1).
a. None.
PRESS TO TEST: LOCK
AN/TPM-25A
2
ure 5.1-11.
REPLIES panel MODULATION
b. On AN/USM-281A, adjust DIV
b. None.
SET M4-3P REPLY WIDTH 0.45
DELAY as required to observe
SUB PULSE SEL: OFF RANGE
reply pulse on B INPUT.
DELAY SEL (USEC): 0001.
c. On A N / U P M - 1 5 A , a d j u s t
c. None.
MEASUREMENT PANEL: PRF
POSITIVE AMPLITUDE for a
RANGE: X100 FUNCTION SEL
5 volt delayed pulse on A IN-
PRF CHAL
PUT.
DEMOD VID LEVEL: Mid position
d. On AN/UPM-15A. adjust PULSE
SIF CHAL VID panel SIF MODE
d. None.
WIDTH fine control for a .5 s
SEL OFF 20V/5V: 5V
pluse on oscilloscope A input.
TRIG SEL panel: DCE MODE SEL:
e. None.
e. While observing the reply pulse on
SEL: lNTDC/EXT: EXT
oscilloscope B INPUT and the
S I G GEN FUNCTION: FIXED
delayed pulse on B INPUT.
FREQ SIG GEN NORM/INTER
adjust AN/UPM-15A PULSE
LEAVE: NORM
DELAY to position the leading
SUM ATTEN: -6 DB
edge of the delayed pulse 3.5 s
GATING PASS: 00
from leading edge of the reply
GATING INHIB: 00
pulse.
AN/USM-281A
Sweep display switch DELATED
MAIN TIME/DIV: .1 MSEC
D E L A Y E D TIME/DIV: 1 sec
EXT 10/EXT/INT/LINE: EXT
INT/AUTO/EXT/EXT AUTO
MAINSLOPE +: + DELAYED
SLOPE +: +
MAIN ACS/ACF/AC/DC: DC
DIV DELAY: 475
A VOLTS DIV: 5
B VOLTS DIV: 2
.!-
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