Service Information
6-7
Path isolation tests
These tests check the leakage resistance (isolation) between
adjacent paths. A path is defined as the high (H) and low (L)
circuit from a row to a column that results by closing a par-
ticular crosspoint. In general, the test is performed by apply-
ing a voltage (+100V) across two adjacent paths and then
measuring the leakage current across the paths. The isolation
resistance is then calculated as R = V/I. In the following pro-
cedure, the Model 6517A functions as both a voltage source
and an ammeter. In the R function, the Model 6517A inter-
nally calculates the resistance from the known voltage and
current levels and displays the resistance value.
1. Turn off the Model 7001/7002 if it is on.
2. Jumper the high (H) terminal to the low (L) terminal for
each row (Figure 6-5).
3. Connect the Model 6517A to rows A and B as shown in
Figure 6-5. Make sure the voltage source is off. Also,
make sure there are no other connections to the card.
4. Install the Model 7022 in slot 1 of the Model 7001/7002.
WARNING
The following steps use high voltage
(100V). Be sure to remove power from
the circuit before making connection
changes.
5. Place the Model 6517A in the R measurement function.
6. Turn on the Model 7001/7002 and program it to close
channels 1!1 (row A, column 1) and 1!7 (row B,
column 2).
7. On the Model 6517A, 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) between row A, column 1 and row
B, column 2.
9. Turn off the Model 6517A voltage source.
10. Turn off the Model 7001/7002.
11. Disconnect the Model 6517A from rows A and B, and in
a similar manner, reconnect it to rows B and C (picoam-
meter high to row B and voltage source high to row C).
12. Turn on the Model 7001/7002 and program it to close
channels 1!7 and 1!13.
13. On the Model 6517A, 100V.
14. After allowing the reading on the Model 6517A to settle,
verify that it is >1G
Ω
.
15. Using Table 6-2 as a guide, repeat the basic procedure in
steps 9 through 14 for the rest of the path pairs (starting
with test 3).
WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
!
1
15V
!
90-110V
105-125V
180-220V
210-250V
A
B
C
1
3
4
5
6
2
Model 7022
HI
Model 6517A
Model 7025
Unterminated
Triax Cable
(Red)
Banana to Banana Cable
Unterminated
Banana Cables
Source V and
Measure V/I
Note: Setup shown is configured
to test isolation between
row A column 1 and row B
column 2.
HI
Columns
Jumpers
(1 of 5)
Rows
H L
H L
H L
H L
H L
H L
H
L
H
L
H
L
D
H
L
E
H
L
Ground Link
Removed
Figure 6-5
Path isolation testing (guarded)
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