4 Wire Thermometer Diagram. Horton hot rod parts december 2018 catalogue pages 101 124. The resistance error due to lead wire resistance is zero.
The document has moved here. The resistance error due to lead wire resistance is zero. Obtaining from factor a to direct b.
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L1 and l3 carry the measuring current while l2 acts only as a potential lead. A further possibility to substantially decrease the influence of the cabling is to increase the conductor cross section. In a 4 wire rtd the actual resistance of the lead wires can be determined and removed from the sensor measurement. It is used both for precision measurements of the highest accuracy and for routine industrial work.