Service Information
5-14
10. Turn off the Model 6517A voltage source.
11. Program the mainframe to close channel 1!1 (bank A,
input 1).
12. On the Model 6517A, 60V.
13. After allowing the reading on the Model 6517A to settle,
verify that it is also >1G
Ω
(10
9
Ω
). This measurement
checks the differential isolation of input 1.
14. Using Table 5-4 as a guide, repeat the basic procedure in
steps 10 through 13 to test inputs 2 through 4 of bank A
(test numbers 3 through 5 of the table).
15. Using Table 5-4 (test numbers 6 through 45), repeat the
basic procedure in steps 5 through 14 to test banks B
through I.
16. Turn off the Model 6517A voltage source.
NOTE
Refer to the following procedure to check
common-mode isolation.
17. Turn off the mainframe and connect the electrometer to
the Model 7035 as shown in Figure 5-7.
18. Repeat steps 3 through 15 to check common mode iso-
lation. Verify that each reading is >1G
Ω
(10
9
Ω
).
Table 5-4
Differential and common-mode isolation testing
Test
number
Differential or com-
mon mode isolation
Channel
closed*
Test
number
Differential or com-
mon mode isolation
Channel
closed*
1
2
3
4
5
Bank A
Bank A, Input 1
Bank A, Input 2
Bank A, Input 3
Bank A, Input 4
None
1!1
1!2
1!3
1!4
26
27
28
29
30
Bank F
Bank F, Input 21
Bank F, Input 22
Bank F, Input 23
Bank F, Input 24
None
1!21
1!22
1!23
1!24
6
7
8
9
10
Bank B
Bank B, Input 5
Bank B, Input 6
Bank B, Input 7
Bank B, Input 8
None
1!5
1!6
1!7
1!8
31
32
33
34
35
Bank G
Bank G, Input 25
Bank G, Input 26
Bank G, Input 27
Bank G, Input 28
None
1!25
1!26
1!27
1!28
11
12
13
14
15
Bank C
Bank C, Input 9
Bank C, Input 10
Bank C, Input 11
Bank C, Input 12
None
1!9
1!10
1!11
1!12
36
37
38
39
40
Bank H
Bank H, Input 29
Bank H, Input 30
Bank H, Input 31
Bank H, Input 32
None
1!29
1!30
1!31
1!32
16
17
18
19
20
Bank D
Bank D, Input 13
Bank D, Input 14
Bank D, Input 15
Bank D, Input 16
None
1!13
1!14
1!15
1!16
41
42
43
44
45
Bank I
Bank I, Input 33
Bank I, Input 34
Bank I, Input 35
Bank I, Input 36
None
1!33
1!34
1!35
1!36
21
22
23
24
25
Bank E
Bank E, Input 17
Bank E, Input 18
Bank E, Input 19
Bank E, Input 20
None
1!17
1!18
1!19
1!20
*Assumes Model 7035 is installed in slot 1 of the mainframe. Program as slot (1) and channel.
Содержание 7035
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