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Page Title:
Sectionalization Test Using AN/TPM-25A-cont. |
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 Control settings
Normal
Paragraph
Indication
reference
Procedure
Equipment under test
Test equipment
Step
c. sensitivity -9
c . C a l c u l a t e t h e t e s t s e t sensi
LOCK FUNCTION:
REPLY WIDTH: 0.45
9
tivity by adding SUM ATTEN dial
SYSTEM
(Cont)
dBm.
reading and the 1000 MHz insertion
SIF REPLY CODE: 7777
loss of cable 45413-139526.
SUB PULSE SEL: OFF
d. Adjust SUM ATTEN dial for a
d. None.
RANGE DELAY SEL: 0100
reading of 3 dB less than that in step
GATING PASS 00
b.
GATING INHIBIT 00
SIF CHAL VID SIF
MODE SEL OFF
TRIG SEL INT DCD/
EXT INT
SIG GEN FUNCTION:
FIXED FREQ
SUM ATTEN: 0 DB. All
other switch settings
immaterial.
AN/USM-281A DISPLAY:
10
probe (Figure 3-25) to each of the
A MAIN TIME/DIV
following test points in the order
DELAYED TIME/
g i v e n to perform receiver and
DIV as required for wave-
decoder tests. Observe whether the
form
pulses are normal.
(1) 3-6j.
(1) A10TP5(video enable delay) . . . .
(2) 3-6i.
(2) A9TP4 (video enable output) . . . .
(3) A11TP1 (video shaper output) . . .
(4) A9TP3(line drive enable out-
put . . . . . . . . . . . . . . . . . . . . . . .
(5) 3-6j.
(5) A10TP4 (line drive pulse) . . . . . . .
(6) 3-6j.
(6) A10TP2 (delay line pulse) . . . . . .
(7) 3-6j.
(7) A10TP1 (delay line main gate
input) . . . . . . . . . . . . . . . . . . . .
(8) A11TP2 (comparison pulse
shaper output). . . . . . . . . . . . .
(9) 3-6j.
(9) A10TP6 (read delay) . . . . . . . . . . .
(10) 3-6k.
(10) A12TP4 (error blanking) . . . . . . .
b. Indications are
b. Check the following dc levels with
(1) 7-12 volts dc.
(1) A11TP6 (error detector output.
Set AN/TPM-25A SIF REPLY
CODE switches to 7776 to
observe low & level. Return
switches to 7777 to observe
normal indication.
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