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SERVICE INFORMATION
7072
Matrlr
Card
Figure 4-6. Connections
for Path Resistance Verification
Procedure
1. Turn on the Model 196 DMM and allow it to warm up
for at least one hour before beginning
the test.
2. With the power off, install the Model 7072 card in slot
1 of the mainframe.
3. Connect the four triaxial cables to the Model 196 and
the two triax tee adapters (Figure 4-6), but do not yet
connect the adapters to the Model 7072.
4. Temporarily
connect
the two triax
tee connectors
together using a third triax tee adapter, as shown in
Figure 4-7.
5. Select the ohms function,
3000 range, and 6%digit
resolution
on the Model 196.
6. After the reading settles, enable zero on the Model 196
DMM.
Leave zero enabled for the remainder
of the
tests.
7. Disconnect
the two triax tee adapters from the short-
ing adapter, and connect the two adapters with the
cable to the row A and column
1 connectors on the
Model 7072 (see Figure 4-6).
8. Close crosspoint
Al, and allow the reading to settle.
9. Verify that the resistance reading is < 3.50.
10. Open the crosspoint,
and disconnect the triax adapter
from column
1. Connect the adapter to column 2.
11. Repeat steps 8 through
10 for columns 2 through
12.
In each case, the column adapter must be connected
to the column under test, and the crosspoint must be
closed.
4-8
I
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