This test determines a conductor’s direct current (DC) resistance at a specified reference temperature (typically set at ambient temperature). There are two methods used to conduct this test known as the Kelvin Bridge Method and the Wheatstone Bridge Method, which are used to obtain the resistance of the specimen. Both methods will give similar results, however, the Kelvin Bridge Method is more accurate. At the end of the test, the reported results include the specimen’s conductor resistance and the test parameters.
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Perform visual examination of the sample and record any defects found.
Strip insulation from both ends of the test sample and attache to test circuit.
Record the ambient temperature.
Place a low electrical current and precision voltage on the test sample. Record the voltage drop on the sample.
Report the calculated conductor resistance and test conditions.