odel 2001-TCSCAN Scanner Card User's Manual Section 3:
2001-TCSCAN-900-01 Rev. A / April 2018 3-11
Four-wire resistance tests
More precise measurements over a wide range of conditions can be obtained by using the 4-wire
measurement scheme shown in the figure below. Sense leads are routed from the DMM through the
scanner to the resistor under test. The extra set of sense leads minimizes the effects of voltage drops
across the test leads and reduces measurement errors with lower DUT resistances. Note that two
extra poles of switching are required for each resistor tested. For this reason, only four resistors can
be tested using this configuration.
Figure 20: Four-wire resistance connections
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