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5.3.7 Bank and channel-to-channel isolation tests
Bank isolation tests check the leakage resistance between ad-
jacent banks. Channel-to-channel isolation tests check the
leakage resistance between a Bank Output connection and a
Bank Input connection with an adjacent Bank Input relay
closed. In general, the tests are performed by applying a volt-
age (100V) across the leakage resistance and then measuring
the current. The isolation resistance is then calculated as R =
V/I. In the following procedure, the Model 617 functions as
both a voltage source and an ammeter. In the V/I function,
the Model 617 internally calculates the resistance from the
known voltage and current levels and displays the resistive
value.
Perform the following steps to check bank and channel-to-
channel isolation:
1. Turn off the Model 7001/7002 if it is on, and remove any
jumpers or test leads connected to the multiplexer card.
2. Turn on the Model 617, and allow the unit to warm up
for two hours before testing.
3. On the Model 617, select the 2pA range, and enable zero
check and zero correct in that order. Leave zero correct
enabled for the entire procedure.
Banana to Banana Cable
Ground Link
Removed
INPUT
Source V and
Measure V/I
Model 617
Unterminated
Banana Cables
Note : Setup shown is configured
to test isolation between
Bank A and Bank B.
Figure 5-4
Bank isolation test connections
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4. Connect the electrometer to the Model 7015, as shown
5. Install the Model 7015 in slot 1 of the Model 7001/7002,
6. On the Model 617, select the 20pA range and release
7. On the Model 617, press SUPPRESS to cancel offset
8. On the Model 617, set the voltage source for +100V, and
9. Place the Model 617 in the V/I measurement function by
10. Program the Model 7001/7002 to close Channels 1!1
Model 7025
Unterminated
Triax Cable
1
2
3
A
HI
(Red)
B
C
D
H
L
H
L
H
L
H
in Figure 5-4.
and turn on the mainframe.
zero check.
current, then enable zero check.
WARNING
The following steps use high voltage
(100V). Be sure to remove power from
the circuit before making connection
changes.
select the 20nA current range. Make sure the voltage
source is in standby.
pressing SHIFT OHMS.
and 1!12 (Bank A, Input 1 and Bank B, Input 2).
Bank Inputs
4
5
6
7
8
L
H
L
H
L
H
L
H
L
H
Model 7015
Service Information
9
10
H
L
H
L
Bank
Outputs
H
L
H
L
L
H
L
5-7
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