Comparing Pulse Position Test

TM 11-6625-667-45/NAVAIR 16-30APM123-2/TO 33A1-3-367-22

cilloscope DELAY TIME MULTIPLIER control

11 controls to position pulse for pulse width meas-

clockwise to position them. The pulses should be ob-

urement.

served in the order given.

f. Measure video pulse width. It should be 0.7

NOTE

+0.0 -0.05 sec.

If necessary, adjust the indicated control

NOTE

to center the pulse.

If necessary, adjust module All pulse

width control A11R6 to obtain the re-

Pulse

Control

Pulse

Control

A1 . . . . . . . . . . . ATR2

D1 . . . . . . . . . . . A7R8

quired performance standard.

C 2 . . . . . . . . . . . . . A7R3

B2 . . . . . . . . . . . . . A7R9

g. Disconnect cable from test set test point

A2. . . . . . . . . . . . . A7R4

D2. . . . . . . . . A7R10

A11TP1 and connect to test point A11TP2. Width

C4 . . . . . . . . . . . . . .A7R5

B4 . . . . . . . . . . . . A7R11

of comparison pulse should be 0.5 0.01 micro-

A4 . . . .. . . . . . . . . . A7R6

F2 . . . . . . . . . . A7R13

second.

B1 . . . . . . . . . . . . . . A7R7

NOTE

i. Set the AN/UPM-98 SIF CODER unit FUNC-

If necessary, adjust comparison Pulse

TION control to ID.

width control A11R15 to obtain the re-

j. Set the test set FUNCTION control to I/P and

the MODE control to position 2.

quired performance standard.

k. Adjust the oscilloscope DELAY TIME MULTI-

7-8. Comparing Pulse Position Test

PLIER control clockwise until the pulses are ob-

Connect the equipment as show in figure 7-1. Set

served. Determine whether the I/P pulses are.

and adjust the controls as described in paragraph

aligned as in g above.

7-3.

NOTE

a. Disconnect the oscilloscope CHANNEL B cable

If necessary, adjust control A7R14 to cen-

from test point A9TP4 and connect the cable to test

ter the CHANNEL B pulse within the

point A11TP2.

CHANNEL A pulse.

b. Disconnect the CHANNEL A cable from the

AN/UPM-98, and connect the cable to teat point 7-8.1. Comparing Pulse Position Test

Using AN/UMP-137A

A11TP1.

c. Set the oscilloscope HORIZONTAL DISPLAY Connect the equipment as shown in figure 7-1.1.

control at B INTENSIFIED by A.

Set and adjust the controls as described in para-

d. Set the TIME BASE A TIME/CM control to 0.1 graph 7-3.2.

sec and TIME BASE B TIME/CM control to 0.2

a. Connect AN/UPM- 137A oscilloscope

sec.

VERTICAL-CHAN A-VIDEO IN jack to test set test

e. Adjust the DELAY TIME MULTIPLIER con-

point A11TP1 and AN/UPM-137A oscilloscope

trol until the second pulse of the train on CHAN-

VERTICAL-CHAN B-VIDEO IN jack and test set

NEL A is intensified.

test point A11TP2.

f. Set the oscilloscope HORIZONTAL DISPLAY

b. Adjust AN/UPM-137A oscilloscope controls

control at A DEL'D BY B. The C1 pulse of each

as necessary to observe C1 pulse of both displays.

train should be 0bserved.

c. Determine whether pulse displayed on

NOTE

AN/UPM-137A oscilloscope CHAN A is centered

If necessary, carefully adjust the DELAY

with respect to pulse at CHAN A.

TIME MULTIPLIER control to center

NOTE

these pulses on the display.

If necessary, adjust control A7R1 in

g. Determine whether the pulse at CHANNEL B

module A7 to center the pulse as accurate-

is centered with respect to the pulse at CHANNEL

ly as possible.

d. Repeat b and c above for following pulses and ad-

NOTE

just indicated control, if necessary. Pulses should be

If necessary, adjust control A7R1 in

observed and adjusted in order given.

module A7 to center the pulse as accurate-

Pulse

Control

Pulse

Control

ly as possible.

D1 . . . . . . . . . . . .. A7R8

A1 . . . . . . . . . . . . .. A7R2

h. Determine as in g above, whether each of the

B2 . . . . . . . . . . . .. A7R9

C2 . . . . . . . . . . . . .. A7R3

D2 . . . . . . . . . . . .. A7R10

A2 . . . . . . . . . . .. A7R4

pulses listed below is centered by adjusting the os-

7-7

Change 4