Initial Test Procedures Using AN/UPM-137A-CONT.

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

Position

Control

set just barely indicates ACCEPT. Using the

VERTICAL-CHAN B-AC/DC. DC

AN/USM-207 and CM-77A/USM, measure and

VERTICAL-CHAN B-75 Ω

note the frequency.

IN/OUT . . . . . . .. ... ..... 5

d. Subtract the frequency obtained in b above

VERTICAL-CHAN

from that obtained in c above. The results should be

B-VOLT/DIV.. . . . . . . . . . . OFF

6.5 1 MHz.

CALIBRATORS-XTAL

MARK (SEC) . . . . . . . . . . . OFF

e. Add the two frequency values determined in b

HORIZONTAL-SWEE

and c above and divide by two. The results should be

DELAY (SEC)-DLY

1,090 .5 MHz.

RANGE MULT . . . . . . . . . . X400

f. Set and adjust AN/UPM-137A oscilloscope as

HORIZONTAL-SWEEP

indicated below:

DELAY (SEC)-MULT

1-11 . . . . . . . . . . . . . . . . . . As required for proper dis-

Position

Control

play.

EXT DC-

HORIZONTAL-SYNC . . . . . .

g. Turn on AN/UPM-137A and test set and allow

DISPLAY-CHAN A/ALT/

CHANT . . . . . . . . . . . . . . . ALT

5-minute warmup.

VERTICAL-CHAN A-AC/DC. DC

h. Press test set PUSH TO TEST and turn to

VERTICAL-CHAN A-75 Ω

LOCK position. Test set ACCEPT indicator should

IN/OUT.. . . . ... . . . . . . . . OUT

light.

VERTICAL-CHAN

A-VOLT/DIV . . . . . . . . . . . . 5

Change 4

7-3