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Page Title: Sectionalization Tests Using AN/UPM-98.-CONT.
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Control settings
Normal
Panagraph
Equipment
reference
indication
Procedure
under test
Test equipment
Step
(1) RANGE switch at -0 DBM.
(2) BOLO BIAS CURRENT switch at 10-16
MA.
(3) LINE-POWER switch at ON and permit a
15-minute warmup period.
(4) Adjust ZERO SET COARSE and FINE
controls to zero meter.
c. None.
c. Connect the equipment as shown in figure
3-3. Be certain test point A4TP5 is
grounded.
d. Connect the MX-2144A/U to the transponder
d. -9 dbm 1.
test set PROBE jack. Observe the power in-
dication.
e. None.
e. Disconnect the ground from test point A4TP5
and connect A4TP4 to ground. Turn
RANGE switch to 10 DBM.
f. Meter deflects slightly to 3-6d.
f. Observe the power meter indication. When
right (approximately
finished with this step remove the ground
-21 dBm).
from A4TP4.
a. None.
Same as step 1 . . . . . . . . . . a. Connect the equipment as shown in A, figure
7
AN/USM-281A
3-4. Turn on the oscilloscope and test set.
POWER: ON
Permit a few minutes warmup time.
Sweep Display Switch: Delayed
b. None.
b. Adjust the oscilloscope HORIZONTAL Posi-
Delayed Time/Div: 5sec
tion Main Trigger Level INTENSITY, FO-
Main Time/Div: 10sec
CUS, and ASTIGMATISM controls until a
Sweep Mode AUTO
clear and stable waveform is observed. .
MAIN SLOPE: -
c. Pulse-pair (P1-P3) and 3-6d.
DELAYED SLOPE
c. Set the transpondr test set MODE switch to
pulase present for
1, 2, 3A and C and observewhether a pulse-
DIV DELAY 02
modes 1, 2, 3/A, TEST
pair (P1-P3) and low level P2 pulse are pres-
Main Trigger source
and C.
ent for each mode.
Switch: EXT
DISPLAY A
A VOLTS/DIV: 5
A POLARITY:+ Up
A Input Coupling Switch: AC
Same as step 1 . . . . . . . . . a. Connect the equipment as shown in B, figure
a. None . . . . . . . . . . . . . . . .
8
AN/USM-281A
3-4. Adjust Main Trigger Level to obtain
Main Trigger Source: Int.
stable trace.
Main Time/Div: 5 SEC
b. Measure the pulse widths of the P1, P2, and
b. P1, P2, and P3 pulse
volts/Div:
P3 pulses.
widths 0.8 sec 0.l.
Magnifier X5

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