What is a Four-wire RTD ?
A very old electrical measurement technique known as the Kelvin or four-wire method is a practical solution to the problem of wire resistance. Commonly employed to make precise resistance measurements
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Formula of 2 Wire RTD, 3 Wire RTD & 4 Wire RTD
2- Wire RTD : where Rpt is Resistance of RTD R2 is Resistance of first lead wire (Extension cable used to connect RTD) R3 is Resistance of second lead wire