5
Objective
This demonstration shows how accu-
rately a low resistance measurement
can be done with 4-wire connection
by comparing the result with 4-wire
connection to the one with 2-wire
connection.
Procedure overview
1. Reset the instrument
2. Perform the measurement via
4-wire connection
3. Perform the measurement via
2-wire connection
4. Compare two results
LAB 2: Make an Accurate Low Resistance Measurement
Setup
1. Connect the yellow banana plug to Ch 1 Low Force terminal.
2. Connect the orange banana plug to Ch 1 Low Sense terminal.
3. Connect the red banana plug to Ch 1 High Force terminal.
4. Connect the brown banana plug to Ch 1 High Sense terminal.
5. Clip the one lead of 1 Ω Resistor with red gold-plated flat tweezers.
6. Clip the other lead of 1 Ω Resistor with black gold-plated tweezers.
Why is 4-wire connection required?
For very low resistance measurements where the residual lead resistance is
comparable to the DUT resistance, the 2-wire measurement will give erroneous
measurement results. In this case a 4-wire connection scheme (remote sensing)
can be used to eliminate this error. A 4-wire measurement uses one pair of leads
to force current and the other pair of leads to monitor voltage. This eliminates
cable resistance effects so that only the voltage drop across the DUT is measured.
Red (11059A)
Yellow (11059A)
Red (11059A)
Black (11059A)
Black
Black
Brown
Brown
Silver
Brown (11059A)
Orange (11059A)
1
2
6
5
3
4
1 Ω Resistor
a) 2-wire connection (R
DUT
≈R
Lead
)
b) 4-wire connection
Lead
DUT
Source
Meas
Meas
R
R
I
V
R
×
+
=
=
2
High Force
Low Force
B2901/02/11/12A
R
DUT
R
Lead
R
Lead
V
Meas
I
Source
DUT
Source
Meas
Meas
R
I
V
R
=
=
High Force
Low Force
Low Sense
High Sense
B2901/02/11/12A
V
Meas
I
Source
R
DUT
R
Lead
A
B
