Programming instructions

66 Verification Tests

module’s removable wiring terminal block as shown in Figure 4-3.

Figure 4-3. Matrix Modules Test Fixture

The fixture contains:

A short circuit between all of the high lines in the Columns

(TP1);

A short circuit between all of the low lines in the Columns (TP2);

A short circuit between all of the high lines in the Rows (TP3);

A short circuit between all of the low lines in the Rows (TP4).

With the test fixture installed, and a Multimeter (i.e. an Agilent 34401A)

connected between the Columns and the Rows, the related Matrix module is

tested by successively closing each relay while checking for an indication of

the closure on the Multimeter.

Tests Procedure To perform the Operation Verification Tests:

1. Remove the wiring terminal block from the Matrix module;

2. Install the related test fixture onto the Matrix module;

3. Set the Multimeter to measure resistance. “Zero” the Multimeter;

4. Press Mon and specify the slot occupied by the Matrix module;

5. Press S.LIST and specify all channels to be scanned;

6. Connect the Multimeter between TP1& TP3 (or TP2 & TP4) on the

test fixture (Figure 4-3 on Page 66);

7. Press Card Reset to reset the Matrix module, the Multimeter should

indicate that all relays are open (very high resistance or overload

indication);

Note If the Multimeter is indicating a very low resistance, one or more of the

relays is remaining closed. You need to do more tests to isolate the clumsy

damaged relay(s).

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