Rievtech xLogic ELC Series User Manual page 32

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 thermocouple.
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).
2-wire （short circuit M+ and Ic) 3 wire
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