Continuity and Insulation Resistance Tests

of 1 ohm, or less, at 0.5 ampere and an insulation

c. Test Procedure (J-1077A/U 0nly). When testing

resistance test of 50 megohms, or greater, at 500 the J-1077A/U, a test probe connected to pin 48 of a

volts dc, as specified in the Peformance Standard 50-pin connector (LBAD-C-14082) is used in place of

(LBAD TF 566).

the output test cable and fixture.

WARNING

(1) Insert the 50-pin connector in receptacle A

of the analyzer.

Receptacle A of the DIT-MCO Analyzer

(2) Position the analyzer AC POWER switch to

carries 500 volts. Be careful!

ON and allow a 10-minute warmup period.

a. Preparation for Test (J-1077(*)/U).

(3) Position the analyzer TEST SELECTION

(1) Insert the 100-pin connectors of rows 1 and 2 switch to LO-VOLTAGE.

of the DIT-MCO adapter box in receptacle 1 and 2

of the analyzer.

CAUTION

(2) Insert Connector U-185(*)/G of the input

test cable (LBAD-D-14083) in either one of the two

Pin 48 of receptacle A is connected directly

26-pair cable receptacles on the distribution box.

into the positive side of the test voltage.

(3) Insert plugs P1 through P5 and P11 of the

On the LO-VOLTAGE test position, 28

input test cable in correspondingly numbered sockets

volts is applied to the pin and on the HI-

of the adapter box. Fasten the clip on the end of the

VOLTAGE test position, 500 volts is applied

single wire to a bare metal surface on the distribution

to the pin and, consequently, to the test

box.

probe; therefore, do not turn the TEST SE-

(4) Place the proper matrix chart in position on

LECTION switch to HI-VOLTAGE during

the analyzer. (Two different charts are used: one for

this test.

the J-10077/U, another for the J-1077A/U.)

b. Test Procedure (J-1077/U Only).

(4) Insert the test probe through the insulated

(1) Connect the output test cable (LBAD-D-

opening in the top of A post of pair 1 binding posts

14081) as follows:

on the distribution box. (A posts are the left side row

(a) Install the output test cable binding post

of posts of each of the two rows, and B posts are the

test fixture on the distribution box binding posts.

right side row of each of the two rows.)

Press the fixture down firmly until the clips slide

(5) Hold the probe on this post until the analyzer

completely over the binding posts.

recycles to the number 1 test position, steps to the

(b) Insert plugs P6 through P10 and P16 of

second position, and stops.

the output test cable in correspondingly numbered

(6) Move the probe to the B post of pair 1. The

sockets of the adapter box.

(2) Position the analyzer AC POWER switch to analyzer should then step from the second to the

third position and again stop. Continue this proce-

ON and allow a 10-minute warmup period.

dure, alternating the probe from the A to the B post

(3) Perform LO and HI-VOLTAGE tests. For

of each succeeding binding post pair, 1 through 26,

each test, the analyzer should step through all test

until the test is complete.

positions and stop on the Chassis Gnd position

(7) Position the TEST SELECTION switch to

shown on the matrix chart.

(4) At the completion of the tests, position the OFF. Remove Connector U-185(*)/G of the input test

cable and insert it in the other 26-pair cable recepta-

TEST SELECTION switch to OFF.

(5) Remove Connector U-185(*)/G of the input cle of the distribution box.

(8) Position the TEST SELECTION switch to

test cable and insert it in the other 26-pair cable

LO-VOLTAGE and repeat the probe test of pre-

receptacle of the distribution box.

(6) Repeat the procedures of preceding (2), (3), ceding (4), (5), and (6).

(9) Position the TEST SELECTION switch to

and (4).

OFF. Remove the 50-pin connector from receptacle

(7) Remove the binding post test fixture from

A of the analyzer.

the distribution box.

(10) Position the TEST SELECTION switch to

(8) Position the TEST SELECTION switch to

MEG TEST ONLY. The analyzer should step through MEG TEST ONLY. The analyzer should step through

will continue beyond the end

all test positions. It will continue beyond the end of all test positions. It

TEST SELECTION switch is

the test until the TEST SELECTION switch is oper- of the test until the

turned to OFF.

ated to OFF.

(9) Disconnect the output test cable from the

d. Test Conclusion. Disconnect all test and power

distribution box.

cables.