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Page Title:
Sectionalization Test Using AN/TPM-25A-cont. |
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 d. Set the transponder test set
d. Pulse pair (P1-P3)
MAIN TRIGGER SOURCE
MODE switch to 1, 2, 3A, and C and
(Cont)
and P2 pulses
SWITCH: EXT
observe whether a pulse pair (P1 P3)
Display: A
present for modes 1,
is present for each mode.
A VOLTS/DIV: 5
2, 3/A, TEST and C.
A POLARITY:+ UP
A Input Coupling
Switch AC AN/TPM-25A
MEASUREMENT FUNC-
TION
SEL PWR
SIG GEN FUNCTION
FIXED FREQ
a. Perform system timing setup, step
a. None.
8
ISLS: ON
AN/USM-281A
4 above.
Main Time Div:.1 MSEC
b. Connect the equipment as shown in
b. P1, P2, and P3 pulse
DIV DELAY: 830
widths: 0.8 s 0.1 .
EXT 10/ EXT INT
pulse characteristics test. Adjust
LINE: INT
MAIN TRIGGER LEVEL to obtain
DISPLAY: ALT
stable trace.
c. Set DELAYED TIME DIV to lSEC.
c. Delay between P1 and
P2 should be 2 S
0.2. Delay between
P1 and P3 should be
3S 0.2.
d. Measure the pulse widths of the
d. P1, P2 and P3 pulse
P1, P2, and P3 pulses using the .1 s
widths should be 0.8
frequency markers.
s 0.1.
e. Measure the spacing between the
e. P1-P3 pulse spacing.
P1, P2, and P3 pulses using .ls
markers. Measurements are made
from leading edge to leading edge.
f. Set
the
test
set
MODE
switch at each of the following
positions (adjust DELAY DIV and
DELAYED TIME/DIV as required
and measure delays
Mode (1) 2 . . . . . . . . . . . . . . . . . . . . . . .
(1) 5 s 0.2.
(2) 3/A . . . . . . . . . . . . . . . . . . . . .
(2) 8 s 0.2.
Mode
(3) C . . . . . . . . . . . . . . . . . . . . . .
(3) 21 s 0.2.
(4) TEST . . . . . . . . . . . . . . ...0
(4) 6.5 s 0.2.
a. Perform the system timing setup,
a. None.
9
AN/TPM-25A
Set test set CODE
step 4 above.
switches to 7777.
REPLIES panel
b. Rotate AN/TPM-25A SUM ATTEN
b. None.
PUSH TO TEST
MODULATION SEL: SIF
dial to increase attenuation until test
set REJECT light just comes on.
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