Sectionalization Tests Using AN/UPM-98.-CONT.

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

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 . . . . . . . . . . . . . . . .

3-6f.

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