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3-18
Model 7702 switching module
Connections for the switching module are shown in
each of the 40 channels can be used to perform Ω2 measurements. For Ω4 measurements,
a channel pair is used for each 4-wire measurement as shown in
For Ω4 connections, channels 1 through 20 (which are used as the INPUT terminals) are
paired to channels 21 through 40 (which are used as the SENSE terminals). Channel 1 is
paired to channel 21, channel 2 is paired to channel 22, and so on.
Figure 3-7
Ω
2 and
Model 7702
Switching
A. Ω2 connections
Shielded
NOTE Source current flows from input
B. Ω4 connections
Shielding
To achieve a stable reading, it helps to shield resistances greater than 100kΩ. As shown in
Figure 3-6
shield to the input low terminal of the instrument electrically.
Ω
4 connections for Model 7702 switching module
H
CH 1-40
Module
L
H
CH 21-40
L
SENSE
Cable
high (H) to input low (L).
and
Figure
3-7, place the resistance in a shielded enclosure and connect the
Model 2790 SourceMeter
Figure
Optional Shield
Shielded
Cable
Resistance
Under Test
Model 7702
Switching
Module
INPUT
Resistance
Under Test
Optional Shield
®
Swich System Reference Manual
3-7. As shown in
Figure
Figure
3-7B.
H
CH 1-20
L
Shielded
Cable
3-7A,
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