The above figure shows how to make a four-wire current measurement.
PR-E-PT100
It can be connected with one two-wire or three-wire resistance-type the
rmocouple.
When two-wire technology applied, the terminals “ M1+ and IC1 ” (this rule
also shall be applied to ” M2+ and IC2 ” , “ M3+ and IC3 ” ) would be short
connected. Such connection can not compensate error/tolerance caused by
the resistance in measurement loop. The measurement error of 1 Ω
impedance of power cord is proportional to +2.5 ° C
The three-wire technology can inhibit the influence of measurement
results caused by cable length (ohmic resistance).
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