Sectionalization Test Using AN/UPM-137A-cont.

Control settings

Paragraph

Normal Indication

Equipment under test

Test equipment

Procedure

reference

Step

Same as step 1.

TS 779A/U

CAUTION

BOLO BIAS CURRENT

TS 779A/U BOLO BIAS CURRENT

OFF

control must be set to OFF before the

BOLO RES 200

MX-2144A/U is connected to the

BOLO TEMP COEF:

TS-779A/U to avoid equipment

damage

NEG

a. Connect the MX-2144A/U to the TS 779A/U a. None.

input.

b. None.

b. Adjust the TS 779A/U as follows:

(1) RANGE switch at 5 DBM.

(2) BOLO BIAS CURRENT switch at 10-16

(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. Connect the equipment as shown in figure

3-3. Ground A4TP5 by connecting to

A13TP2.

d. Connect the MX-2144A/U to the test set d. 9 dbm 1.

PROBE jack. Observe the power in

dication.

e. Disconnect the ground from A4TP5 and con- e. None.

nect A4TP4 to ground.

f. Observe the power meter indication.

f. -21 dbm 1.

3-6e.

AN/UPM-137 Same as step . . . . . . . . .

a. Connect the equipment as shown in A, figure a. None.

3-4. Turn on the oscilloscope and test set.

VERTICAL CHAIN A-

VOLTS DIV: .5

Permit a few minutes warmup time.

VERTICAL CHAN A-

connect oscilloscope to test set A4TP6.

ACIDC:AC

b. Adjust the oscilloscope HORIZONTAL b. None.

VERTICAL CHAN A-

VERTICAL, INTENSITY, SWEEP

DELAY, FOCUS, and ASTIGMATISM

OUT

controls until a clear waveform is ob-

SYNC:EXT AC

served.

c. Set the transponder test MODE switch to 1, c. Pulse pair (P1-P3) and P2

2, 3A, and C and observe whether a pulse

pulses present for model

pair (P1 P3) and low level P2 pulse are

1, 2, 3,/A. TEST and C.

present for each mode.