Keithley 7015-C, Instruction Manual

Page: 74 / 97

Service Information
5-12
12. Program the Model 7001/7002 to close Channel 1!1
(Bank A, Input 1).
13. On the Model 617, disable zero check, and press OPER-
ATE to 100V.
14. After allowing the reading on the Model 617 to settle,
verify that it is also >1G
Ω
(10
9
Ω
). This measurement
checks the differential isolation of Input 1.
15. Using Table 5-4 as a guide, repeat the basic procedure in
steps 11 through 14 to test Inputs 2 through 10 of Bank
A (test numbers 3 through 11 of the table).
16. Use Table 5-4 (test numbers 12 through 42) and the
above procedure to test Banks B, C and D.
17. Place the Model 617 voltage source in standby, and en-
able zero check.
NOTE
Refer to Figure 5-7 for the following pro-
cedure to check common mode isolation.
18. Turn off the Model 7001/7002, and connect the elec-
trometer to the Model 7015 as shown in Figure 5-7.
19. Repeat steps 4 through 16 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 common
mode isolation Channel
closed*
1
2
3
4
5
6
7
8
9
10
11
Bank A
Bank A, Input 1
Bank A, Input 2
Bank A, Input 3
Bank A, Input 4
Bank A, Input 5
Bank A, Input 6
Bank A, Input 7
Bank A, Input 8
Bank A, Input 9
Bank A, Input 10 None
1!1
1!2
1!3
1!4
1!5
1!6
1!7
1!8
1!9
1!10
12
13
14
15
16
17
18
19
20
21
22 Bank B
Bank B, Input 1
Bank B, Input 2
Bank B, Input 3
Bank B, Input 4
Bank B, Input 5
Bank B, Input 6
Bank B, Input 7
Bank B, Input 8
Bank B, Input 9
Bank B, Input 10 None
1!11
1!12
1!13
1!14
1!15
1!16
1!17
1!18
1!19
1!20
23
24
25
26
27
28
29
30
31
32
33 Bank C
Bank C, Input 1
Bank C, Input 2
Bank C, Input 3
Bank C, Input 4
Bank C, Input 5
Bank C, Input 6
Bank C, Input 7
Bank C, Input 8
Bank C, Input 9
Bank C, Input 10 None
1!21
1!22
1!23
1!24
1!25
1!26
1!27
1!28
1!29
1!30
34
35
36
37
38
39
40
41
42
43
44 Bank D
Bank D, Input 1
Bank D, Input 2
Bank D, Input 3
Bank D, Input 4
Bank D, Input 5
Bank D, Input 6
Bank D, Input 7
Bank D, Input 8
Bank D, Input 9
Bank D, Input 10 None
1!31
1!32
1!33
1!34
1!35
1!36
1!37
1!38
1!39
1!40
*Assumes Model 7015 installed in slot 1 of mainframe. Pro-
grammed as slot (1) and channel.
Table 5-4 (continued)
Differential and common-mode isolation testing
Test
number
Differential or common
mode isolation Channel
closed*
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