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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.
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. 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
POWER: ON
Permit a few minutes warmup time.
Sweep Display Switch: Delayed
b. None.
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: -
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
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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