Resistance Measurements
Specific resistance measurement techniques are discussed in the
following sections. You should also consider the techniques and errors
discussed earlier in this chapter.
The 4-wire ohms method provides the most accurate way to measure
small resistances. Test lead resistances and contact resistances are
automatically reduced using this method. The connections for resistance
measurements are shown below. See also “Resistance Measurement
Configuration” on page 68.
Removing 2-wire Ohm Test Lead Resistance
To eliminate offset errors associated with the test lead resistance in
2-wire ohms measurements, follow the steps below.
1. Short the ends of the test leads together. The meter displays the test
lead resistance.
2. Press
Null from the front panel. The meter displays “0” ohms with the
leads shorted together.
R
=
V
meter
I
test
HI-Sense
Ideal
Meter
LO-Sense
Chapter 7 Measurement Tutorial
Measurement Techniques and Sources of Error
258
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