Test leads with alligator clips | Kelvin method for resistance measurement
The Kelvin method for measuring resistance is also called the four-wire method for measuring resistance. It is possible to avoid the influence of the cable resistance on the test results during the measurement, but two additional Kelvin detection wires are required.
In the traditional test method, the current loop and the test loop are the same loop. The current in the loop flows through the cable resistance to produce a voltage drop, which affects the test results.
The Kelvin method measures resistance by separating the current loop from the test loop through four wires and two loops. The current flowing through the test loop is very small, so in the test loop, the voltage drop on the cable resistance can be ignored, which can be accurately measured.
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