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21.
Repeat steps 14 through 20 to measure isolation resistance between channel 1 HI and
each HI input of channels 3 through 20. Be sure the electrometer is connected to the HI
inputs of the two channels being tested and channel 1 is closed.
22.
Repeat steps 14 through 21 for the LO inputs of channels 1 through 20. Be sure the
electrometer is connected to the LO inputs of the two channels being tested and channel
1 is closed.
23.
Turn off the multimeter power.
24.
With the electrometer voltage source off, connect the Model 6517A Electrometer to
channel 1 HI and chassis ground as shown in
Figure 4-5
Connections for HI and LO input-to-chassis ground isolation tests
Model 7025
Unterminated
Triax Cable
Banana to
Com
Banana
(Ground Link
Cable
Removed)
Model 6171
Triax Adapter
Chassis Ground
25.
Turn on the Model 2000-20 Multimeter power.
26.
Program the multimeter to close channel 1.
27.
On the electrometer, source 60V.
28.
After allowing the reading on the electrometer to settle, verify that it is >100MΩ (10
29.
Turn off the electrometer voltage.
30.
Turn off the multimeter power.
31.
Repeat steps 24 through 30 for channels 2 through 20. One electrometer lead should be
connected to the HI input of the channel being testing, and the other lead should be con-
nected to chassis ground.
32.
Repeat steps 24 through 31 for the LO inputs of channels 1 through 20. One electrometer
lead should be connected to the LO input of the channel being tested, and the other lead
should be connected to chassis ground. Also, channel 1 should be closed.
HI
(Red)
Source V and
Channel 1
Measure V/I
Channel 2-9
V-Source LO
Channel 10
V-Source HI
Model
6517A
Channel 11
Unterminated to
Banana Cable
Channel 12-19
Channel 20
Service Information
Figure
4-5.
Model 2000-SCAN-20
HI
LO
HI
LO
4-Pole
HI
LO
HI
LO
4-9
HI
LO OUT A
HI
OUT B
LO
2-Pole
8
Ω).
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