Service Information
6-9
WARNING
The following steps use high voltage
(100V). Be sure to remove power from
the circuit before making connection
changes.
4. On the Model 6517A, set the voltage source for +100V.
Make sure the voltage source is off.
5. Place the Model 6517A in the R measurement function.
6. Turn on the Model 7001/7002, but do not program any
channels to close. All channel crosspoints must be open.
7. On the Model 6517A, source 100V.
8. After allowing the reading on the Model 6517A to settle,
verify that it is >1G
Ω
. This measurement is the leakage
resistance (isolation) of row A.
9. Turn off the Model 6517A voltage source.
10. Program the Model 7001/7002 to close channel 1!1.
11. On the Model 6517A, 100V.
12. After allowing the reading on the Model 6517A to settle,
verify that it is also >1G
Ω
. This measurement checks
the isolation of column 1.
13. Using Table 6-3 as a guide, repeat the basic procedure in
steps 9 through 12 for the rest of the columns and rows
(test numbers 3 through 11 of the table).
14. Turn off the Model 6517A voltage source and the Model
7001/7002.
15. For each matrix row, jumper the high (H) terminal to the
low (L) terminal as shown in Figure 6-7.
16. Connect the Model 6517A to row A as shown in
Figure 6-7, and repeat steps 6 through 14 to check
common-mode isolation.
Table 6-3
Differential and common-mode isolation testing
Test
no.
Differential or
common-mode
test
Channels closed
1
Row A
None
2
Column 1
1!1
3
Column 2
1!6
4
Column 3
1!11
5
Column 4
1!16
6
Column 5
1!21
7
Column 6
1!26
8
Row B
1!1 and 1!2
9
Row C
1!1 and 1!3
10
Row D
1!1 and 1!4
11
Row E
1!1 and 1!5
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