RT CARD CALIBRATION

T.O. 3lW2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3010

4. Set front panel SELF TEST switch to off

NOTE

(down) position. If the proper display was observed in

step 3, the self-test procedure is complete. If an

Self-testing of the multiplexer set

incorrect display was observed, refer to paragraph 6-11

requires that the set be properly

for corrective maintenance instructions.

configured (chapter 3).

6-33. LAMP TESTING. Lamp testing is performed to

The

performance

self-test

determine that the front panel alarms and displays are

procedures overrides the diagnostic

capable of indicating detected alarm and error

function while in the self-test mode, but

conditions. Perform a lamp test as follows:

does not affect or interrupt the

functional operation of the circuits in the

NOTE

multiplexer set.

The performance of lamp test procedures

Observe that all front panel alarm and

does not affect or interrupt the functional

error indicators are out and POWER CONTROL ON

operation of the circuits in the multiplexer

indicator is lighted.

set.

Set front panel SELF TEST switch to on

1. Press front panel LAMP TEST switch and

(up) position.

observe that all front panel indicators are lighted and the

number 88 appears in the FAULT LOCATION display.

3. Observe that all front panel indicators are

lighted and the number 00 appears in the FAULT

.Release LAMP TEST switch. If a

LOCATION display.

proper display was observed in step 1, the lamp test is

complete. If an incorrect display was observed, refer to

NOTE

paragraph 6-12 for corrective maintenance instructions.

For multiplexer output rates (Ro) above 10

6-34. RT CARD CALIBRATION. Calibration of the RT

kbps, the time required for a final display

card is performed to ensure that the output frequencies

of self-test results is approximately 10

of the reference timing and transition encoding oscillators

seconds. For output rates below 10 kbps,

are within prescribed tolerances. The calibration is

the test time increases as Ro decreases.

performed, using a Hewlett-Packard Model 5245M

Maximum test time at an output rate (Ro) of

frequency counter. The RT card is located in multiplexer

155 bps can reach approximately 10

card file slot 16 (figure 1-2).

Perform calibration

minutes. Maximum test time for output

procedures

follows:

rates below 10 kbps may be estimated,

using the expression:

Time (seconds)= 90,000

6-33