Video Enable Delay and Test-cont.

A VOLTS/DIV 10

B VOLTS/DIV 10

a. The video enable delay

3 as S tep 2 . . . . . . . . . . . . . . . . . . .Same as step 2 . . . . . . . . . . . . . . . .

a. Connect the oscilloscope CHANNEL A to

1.8 0.05

A10TP5. Measure and record the width

microseconds.

of the pulse at CHANNEL A. This is

the video enable delay.

b . None.

b. Disconnect CHANNEL B from A5TP5,

and connect it to A9TP4.

c. T h e v i d e o e n a b l e

c. Adjust the oscilloscope controls until a

period win conclude

complete pulse i s o b s e r v e d a t

within

micro-

C H A N N E L A. Measure the delay

seconds of the trail-

between trailing edges of the last pulse

ing edge of the last

at CHANNEL A. This determines the

expected reply pulse.

video enable period limits.

d . Same as c above.

d. Set the test set FUNCTION switch to

IDENTITY and the AN/UPM-98

F U N C T I O N switch to ID. Repeat

above.

e . Same as c a b o v e ,

e. Set the test set MODE switch to land

after two trails.

the AN/UPM-98 FUNCTION switch to

EMER. Repeat the procedure in

c above.

f. Same as c above.

f. Set the test set FUNCTION switch to

EMER. Repeat the procedure in

c above.