Keithley 2000-SCAN-20, Instruction Manual, Page: 44 / 81

Operation 3-9
Typical applications
Resistor testing
The Model 2000-SCAN-20 can be used to test up to 20 resistors using 2-wire measurements
or up to ten resistors using 4-wire measurements. Such tests use the Model 2000-20
Ω
2 and
Ω
4
resistance functions.
2-wire resistance tests
Figure 3-1 shows a typical test setup for making 2-wire resistance measurements. The
Model 2000-SCAN-20 card provides the switching function, while the Model 2000-20
Multimeter makes the resistance measurements. Since only 2-pole switching is required for this
application, one Model 2000-SCAN-20 card can be used to switch up to 20 resistors.
Measurement accuracy can be optimized by minimizing residual resistance: make connecting
wires as short as possible and limit the number of connectors to minimize path resistance.
Another technique is to short one of the scanner channel inputs, close the shorted channel, and
enable the multimeter REL feature to null out path resistance. Leave REL enabled for the entire
test.
Figure 3-1
2-wire resistance test connections
1
20
20
DUTs
(20)
R
A. Test Configuration
2000-SCAN-20
2000-20
Multimeter
2000-SCAN-20 DUT
1
Out A
HI
LO
DMM 2000-20
Rear Panel
B. Simplified Equivalent Circuit
Ω