-TCSCAN Scanner Card User's Manual Section 3:
2001-TCSCAN-900-01 Rev. A / April 2018 3-9
Resistor testing
The 2001-TCSCAN scanner card can be used to test up to seven resistors using 2-wire
measurements or up to four resistors using 4-wire measurements. Such tests use the DMM6500 2-
and 4-wire resistance functions.
Two-wire resistance tests
The figure below shows a typical setup for make 2-wire resistance measurements. The
2001-TCSCAN scanner card provides the switching function. The resistance measurements are
made by the DMM6500. Since only 2-pole switching is required for this application, one
2001-TCSCAN can be used to switch up to seven resistors. However, the 240 Ω resistance of
channels 5 and 10 may affect the measurement accuracy of 2-wire resistance measurements made
using these channels. Generally, channels 5 and 10 should not be used for 2-wire resistance
measurements unless the scanner card is modified.
Figure 18: Two-wire resistance connections
Figure 19: Two-wire resistance test equivalent circuit
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