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4-wire resistance tests
More precise measurements over a wider range of system and DUT conditions can be
obtained by using the 4-wire measurement scheme shown in
Figure 3-2
. Here, separate sense
leads from the Model 2000 Multimeter are routed through the scanner to the resistor under test.
The extra set of sense leads minimizes the effects of voltage drops across the test leads, greatly
reducing measurement errors with lower DUT resistances. Note, however, that an extra two
poles of switching are required for each resistor tested. For this reason, only five resistors can be
tested using this configuration.
1
DUTs
(5)
R
A. Test Configuration
B. Simplified Equivalent Circuit
5
6
10
1
5
HI
LO
Sense
HI
Sense
LO
HI
Sense HI
LO
Sense LO
2001
2000-SCAN
DUT
2000-SCAN
Ω
Out A
Out B
DMM Rear Panel
(Model 2001/2002 shown)
Figure 3-2
4-wire resistance
test connections
Operation
3-17
Summary of Contents for 2000-Scan
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Page 13: ...1 General Information General Information ...
Page 17: ...2 CardConnections andInstallation CardConnec tionsandInstal lation ...
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Page 58: ...3 24 Operation Section 3 Page 24 Tuesday July 8 2003 2 30 PM ...
Page 59: ...4 Service Information Service Information ...
Page 73: ...5 Replaceable Parts Replaceable Parts ...
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