Video Enable Delay and Period Test

5.2-7. Video Enable Delay and Period Test

a. Test equipment required

(1) Generator, Pulse AN/UPM-15A

(2) Oscilloscope, AN/USM-281A.

(3) Test Set, Radar AN/TPM-25A.

b. Test Connections and Conditions. Performs the system timing setup as described in the chart in

paragraph 5.2-4 c step ( 1). Then connect the equipment as shown in figure 5.2-5, video enable delay and

period test.

c. Procedure

Control settings

Test procedure

Equipment under test

Performance standard

Step

Test equipment

MODE: 2

AN/TPM-25A

a. Connect oscilloscope A INPUT

a None.

REPLIES panel:

CODE (A, B, C, D): 0000

to A10TP5.

FUNCTION: SYSTEM

MODULATION SEL: SIF

b. Observe video enable delay

b. The video enable delay 1.8

POWER: ON

PULSE WIDTH: 0.45

pulse on A INPUT. Measure

PRESS-TO-TEST LOCK

SIF REPLY CODE: 0000

pulse width.

SUB PULSE SEL: OFF

RANGE DELAY SEL SEC):

0001

GATING PASS: 00

GATING INHIBIT: 00

M4 JAMMING: 0

TRIG SEL INT/DCD/EXT

EXT

SIG GEN FUNCTION:

FIXED FREQ

SUM ATTEN: 0 DB

POWER: ON

AN/USM-281A

POWER. ON

Sweep display switch MAIN

MAIN TIME/DIV: 2

INT/AUTO/EXT/EXT10

EXT

MAIN SLOPE + : +

DIV DELAY: 852

DISPLAY: A

A and B VOLTS/DIV: 5

A and B POLARITY: + UP

A and B AC/GND/DC: DC

a None.

a Connect oscilloscope B INPUT

AN/USM-281A

DISPLAY: ALT

to A9TP4.