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Operation
5-7
Two-wire resistance tests
Figure 5-5 shows a typical test setup for making two-wire
resistance measurements. The Model 7021 provides the
switching function, while the resistance measurements are
made by a Model 2000 DMM. Since only two-pole switch-
ing is required for this application, one Model 7021 card can
be used to switch up to 30 resistors (additional multiplex
banks can be added, if desired, by adding more cards).
Accuracy of measurements can be optimized by minimizing
stray resistance.
Make connecting wires as short as possible to minimize
path resistance. Another technique is to short one of the
multiplexer inputs, close the shorted channel, and then
enable the DMM zero feature to cancel path resistance.
Leave zero enabled for the entire test.
Figure 5-5
Two-wire resistance testing
Ω
R
B. Simplified Equivalent Circuit
Model 2000
DMM
7021
DUT
HI
LO
POWER
MODEL 2000 DMM
1
30
30
Single 1x30 MUX
DUTs
(30)
A. Test Configuration
7021
1
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Summary of Contents for 7021
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