Shorting Measurement Paths Using Triax Tee Adapter - Keithley 7174A Instruction Manual

Service Information
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 7174A 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 7174A.
4. Temporarily connect the two triax tee connectors to-
gether using a third triax tee adapter, as shown in Figure
4-7.
5. Select the ohms function, 300 Ω range, and 6 ½ digit res-
olution 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 shorting
adapter, and connect the two adapters with the cable to
To
196
To
196
Figure 4-7

Shorting measurement paths using triax tee adapter

4-10
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the row A and column 1 connectors on the Model 7174A
(see Figure 4-6).
8. Close crosspoint A1, and allow the reading to settle.
9. Verify that the resistance reading is <1.5 Ω .
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.
12. Disconnect the row adapter from row A, and connect it
instead to row B.
13. Repeat steps 8 through 10 for row B. The crosspoints of
interest here are B1 through B12. Also, the row adapter
must be connected to the row being tested.
14. Repeat steps 8 through 13 for rows C through H. In each
case, the crosspoint to close is the one corresponding to
the row and column connections at that time. In all
cases, the measured resistance should be <1.5 Ω .
Triax Tee
Adapters