Reply Evaluation Percentage Tests - TM-11-6625-667-450237

5.2-9 Reply Evaluation Percentage Tests

a. Test Equipment Required

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

(2) Multimeter ME-26B/U.

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

paragraph 5.2-4c step (1). Connect the equipment as shown in figure 5.2-6, reply evaluation per

centage tests.

c. Procedure

Control settings

Equipment under

Test equipment

test

Step

Normal Indication

Procedure

AN/TPM-25A

a. Turn on the AN/TPM-25A and

a. None.

FUNCTION: SYSTEM

REPLIES panel

allow a few mrnutes warmup.

MODULATION SEL:

SIF

POWER: ON

b. Turn on the test set and allow

b. None.

WIDTH:

CODE: 7777

0.45

a few minutes warmup.

PRESS-TO-TEST LOCK

S I F REPLY CODE: 7777

c. None.

c. Set AN/TPM-25A SUB PULSE

MODE: 2

SUB PULSE SEL: Cl

POS SELECT to VARY.

SUB PULSE POS

d. None.

d. Adjust the SUB PULSE POS

Select 0

VARY control until the test set

GATING PASS: 00

barely indicates REJECT.

GATING INHIBIT:00

Adjust the ME 26B/U ZERO

M4 JAMMING: 0

SET to zero meter.

PRT SEL (USEC): 0001

e. None.

e. Adjust the SUB PULSE POS

SIF CHAL VID SIF CODE

VARY control until the test set

SEL: OFF

TRIG SEL INT DCD/EXTY: INT

indicates ACCEPT. Note

SIG GEN FUNCTION: FIXED

ME 26B/U indication.

f. The test set will provide

f. Adjust the SUB PULSE POS

FREQ ME 26B/U

an ACCEPT indication

VARY control in either direc-

RANGE: 30V

when 80% or more replies

tion, until the test set barely

SELECTOR (+)

indicates REJECT. Note the

are correct.

ME-26 B/U indication. The

voltage should be 80% of that

noted in c above.