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Service Information
14. Using Table 6-4 as a guide, repeat the basic procedure in
steps 10 through 13 to test the rest of the inputs of bank
A (test numbers 3 through 13 of the table).
15. Use Table 6-4 (test numbers 14 through 32) and steps 5
through 13 to test bank B.
16. Turn off the Model 6517A voltage source.
Ground Link
Removed
Banana to
Model 7025
Banana Cable
Unterminated
Triax Cable
WARNING:
WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
!
CAUTION:
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
Jumper
1
2
HI
A
(Red)
3
4
B
H
L H
L H
Figure 6-7
Common-mode isolation test connections
6-12
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Source V and
Measure V/I
90-110V
180-220V
105-125V
210-250V
!
Model 6517A
Unterminated
Banana Cable
6
7
11
12
16
17
5
8
9
10
13
14
L
H
L
H
L H
L H
L H
Refer to Figure 6-7 for the following pro-
cedure to check common-mode isolation.
17. Turn off the mainframe, and connect the electrometer to
the Model 7021 as shown in Figure 6-7.
18. Repeat steps 3 through 15 to check common-mode iso-
lation. Verify that each reading is >1G Ω (10
Note: Setup shown is configured
Bank Inputs
22
26
27
21
H
L
18
19
20
23
15
L
H
L H
L H
L H
L H
L H
Model 7021
NOTE
Ω ).
9
to test isolation between
Bank A and chassis ground.
24
25
28
29
30
H
L
L H
L H
L H
L H
L
Bank
Outputs
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Troubleshooting
