Sectionalization Tests Using AN/UPM-98-CONT.

Contro1 settings

Procedure

Step

Test equipment

Equipment under test

Normal indication

c. Adjust oscilloscope TIME/DIV control c. 36 pulses present: 4 pulses, a

Sweep Display Switch

vacant position, and 32

Until one complete group to

Mixed

pulases.

Sweep MODE Switch AUTO

challenge video pulses is observed.

Count number of pulses.

Delayed Trigger

d. Measure amplitude of first and last d. 10% maximum difference in

Source: EXT

amplitude between two

pulse and detamine percentage of

Main SLOPE -

pubes.

difference.

Main Trigger Coupling: AC

e. Measure spacing between first and e. 2 0.07 sec

Display A

A VOLTS/DIV: 5

second pulse.

f. 0.5 0.1 sec.

f. Measure pulse width of first pulse.

a. Set transponder test set ISLS switch a. Fifth pulse position occupied.

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

to ON. Note whether a pulse,

having similar amplitude as others,

occupies fifth pulse position.

b. Measure pulse spacing with respect to b. 8 0.7 sec.

first pulse.

c. Measure ISLS pulse width.

c. 0.5 0.1 wed.

d. Transponder test set ILSL switch d. pulse amplitude decreases.

to OFF. Note whether amplitude of

fifth pulse decreases.

e. Disconnect c a b l e a t R F I N o f e . None.

AN/APM-270(V) and connect cable

to modulator RF OUT.

a. Adjust AN/APM-27(V) SPACING a. None.

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

PUSH TO TEST: Continually press and

PULSE 2 control towards -0.5 un-

release to observe specific conditions.

til transponder test set REJECT

indicator just glows.

b. Adjust AN/APM-27(V) SPACING b. 1.7 sec minimum, 1.9 sec

maximum.

PULSE 2 control clockwise until a

just accept condition is obtained.

Note spacing between leading

edges of first and second reply

modulation pulses. Continue to

turn control clockwise until a

REJECT indication is observed.

and then clockwise until a just

accept condition is again obtained

Note spacing between first and

second pulses.

c. Reset AN/APM-207(V) SPACING 2 c. None.

control to 0.

d. Perform a and b above using SPAC- d. 3.5 sec minimum, 3.7 sec

ING PULSE 3 control and observe

maximum.

spacing between first and last

pulses. Return control to 0.