Laurel Electronics Laureate Ohmmeter for Resistance in Ohms or Milliohms User Manual
Page 3
LAUREL
ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 3
Resistance Measurement with Excitation & Lead Compensation
In 4-wire hookup, different pairs of leads are used to apply the
excitation current and sense the voltage drop across the unknown
resistance, so that the IR drop across the excitation leads is not a
factor.
In 3-wire hookup, the meter senses the combined voltage drop
across the unknown resistance plus two excitation leads. It also
senses the voltage drop across one excitation lead, and then
subtracts twice this voltage from the combined total. This techni-
que effectively subtracts all lead resistance and compensates for
ambient temperature changes if the two excitation leads are
identical.
In 2-wire hookup, the meter senses the combined voltage drop
across the unknown resistance and both lead wires. The voltage
drop across the lead wires can be measured by shorting out the
resistance during meter setup, and this voltage is then automatic-
ally subtracted from the combined total. However, changing resist-
ance of the lead wires due to ambient temperature changes will
not be compensated.
Ohmmeter hookup can be via 2, 3 or 4 wires to the J5 connector. The meter applies
a fixed excitation current for each resistance range.
Mechanical
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