Tektronix KEITHLEY SourceMeter 2606B Reference Manual page 119

Section 5: Sourcing and measuring Model 2606B System SourceMeter® Instrument Reference Manual
Ohms sensing
Ohms measurements can be made using either 2-wire or 4-wire sensing. See DUT test connections
(on page 4-3) for information on connections and sensing methods.
The 2-wire sensing method has the advantage of requiring only two test leads. However, as shown in
the following figure (2-wire resistance sensing), test lead resistance can seriously affect the accuracy
of 2-wire resistance measurements, particularly with lower resistance values.
Figure 43: Two-wire resistance sensing
5-18 2606B-901-01 Rev. C November 2021