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Operation
5-8
Four-wire resistance tests
More precise measurements over a wider range of system and
DUT conditions can be obtained by using the four-wire mea-
surement scheme shown in Figure 5-6. Here, separate sense
leads from the Model 2000 DMM are routed through the
multiplexer to the resistor under test. The extra set of sense
leads minimizes the effects of voltage drops across the test
leads. Note, however, that an extra two poles of switching are
required for each resistor tested. For this reason, only 12 re-
sistors per card can be tested using this configuration be-
cause two channels must close at the same time.
Figure 5-6
Four-wire resistance testing
HI
LO
POWER
Model 2000
1
Dual 1x12 MUX
DUTs
(12)
A. Test Configuration
12
13
24
1
12
Input HI
Input LO
Sense
Ω
4 Wire
HI
Sense
Ω
4 Wire
LO
DMM
7021
R
B. Simplified Equivalent Circuit
Input HI
Sense
Ω
4 Wire HI
Input LO
Model 2000
DMM
7021
DUT
Ω
Sense
Ω
4 Wire LO
Note: Jumpers between Banks A
and B are removed.
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