Figure 3-9 Ω2 And Ω4 Connections For Model 7700 Switching Module - Keithley 2701 User Manual

3-22 Basic DMM Operation
Model 7700 switching module
Connections for the switching module are shown in
each of the 20 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 10 (which are used as the INPUT terminals) are
paired to channels 11 through 20 (which are used as the SENSE terminals). Channel 1 is
paired to channel 11, channel 2 is paired to channel 12, and so on.
Figure 3-9
Ω2 and Ω4 connections for Model 7700 switching module
Model 7700
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 3-8
shield to the input low terminal of the instrument electrically.
H
Switching
CH 1-20
Module
L
H
CH 11-20
L
Cable
high (H) to input low (L).
and Figure 3-9, place the resistance in a shielded enclosure and connect the
Optional Shield
Shielded
Cable
Resistance
Under Test
Model 7700
Switching
Module
SENSE INPUT
Resistance
Under Test
Optional Shield
Model 2701 User's Manual
Figure 3-9. As shown in
Figure 3-9B.
H
CH 1-10
L
Shielded
Cable
Figure 3-9A,