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Service Information
NOTE
Refer to the following procedure to check
channel-to-channel isolation.
11. Turn off the mainframe and connect the Model 6517A to
the card as shown in Figure 6-5.
12. Install the Model 7021 in slot 1 and turn on the main-
frame.
13. Program the mainframe to close channel 1!2 (bank A,
input 2). Make sure all other channels are open.
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.
1
2
HI
A
(Red)
3
4
B
H
L H
L H
Jumper
Figure 6-5
Channel-to-channel isolation test connections
6-8
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Source V and
Measure V/I
90-110V
180-220V
105-125V
210-250V
!
Model 6517A
Unterminated
Banana Cables
6
7
11
12
16
17
5
8
9
10
13
14
L
H
L
H
L H
L H
L H
14. On the Model 6517A, source 100V.
15. After allowing the reading on the Model 6517A to settle,
verify that it is >1G Ω (10
16. Turn off the Model 6517A voltage source.
17. Using Table 6-3 as a guide, perform tests 2 through 11
for the remaining bank A inputs. Remember to move
bank input connections as indicated in the table.
18. Use Table 6-3 (test numbers 12 through 28) and the
above procedure to test bank B inputs.
Note: Setup shown is configured
Bank Inputs
22
26
27
21
H
L
15
18
19
20
23
24
L
H
L H
L H
L H
L H
L H
Model 7021
Ω ).
9
to test isolation between
path 1!1 and 1!2.
Bank
Outputs
25
28
29
30
H
L
L H
L H
L H
L H
L
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Troubleshooting
