What is a Three-wire RTD ?
A compromise between two-wire and four-wire RTD connections is the three-wire connection, which looks like this: In a three-wire RTD circuit, voltmeter “A” measures the voltage dropped across the RTD
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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