Tutorial 7
Keysight 34970A/34972A User’s Guide 305
The 4-wire ohms method is used in systems where lead resistances can become
quite large and variable and in automated test applications where cable lengths
can be quite long. The 4-wire ohms method has the obvious disadvantage of
requiring twice as many switches and twice as many wires as the 2-wire method.
The 4-wire ohms method is used almost exclusively for measuring lower
resistance values in any application, especially for values less than 10Ω and for
high-accuracy requirements such as RTD temperature transducers.
HI-Sense
V
meter
I
test
LO-Source
HI-Source
R=
V
meter
I
test
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LO-Sense
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