One solution is called the Kelvin, or 4-wire, resistance measurement method. It involves the use of an ammeter and voltmeter, determining specimen resistance by Ohm's Law calculation. The voltage dropped across the resistance is measured by the voltmeter, and resistance calculated using Ohm's Law (R=E/I).
What is a 4-wire test?
Four-wire testing can measure the device-under-test (DUT) without measuring the fixturing. While normal testing has one wire connected to each end of the cable, each wire sending a current and recording the result, four-wire has two wires for each side of the cable.
What is the purpose of doing a four-terminal resistance measurement?
The four-terminal measurement is also known as 4-wire sensing, 4-point probes method or Kelvin sensing. It is a method for accurate measuring of resistances in the unit under test (UUT). It eliminates internal transition resistances and resistivities in the adaption.
What is the 4-wire method?
Four-terminal sensing (4T sensing), 4-wire sensing, or 4-point probes method is an electrical impedance measuring technique that uses separate pairs of current-carrying and voltage-sensing electrodes to make more accurate measurements than the simpler and more usual two-terminal (2T) sensing.
What is 4-wire Kelvin test?
4-wire Kelvin testing is a methodology where high resolution measurements are taken to determine finite changes in resistance.
What is the benefit of a four wire resistance measurement?
The principal advantage of 4-wire measurement is that it eliminates any effect of fixture resistance (the lead wires) to obtain a precise resistance value of the UUT.
Why four wire configuration should be used for resistance verification of a digital multimeter?
Four-wire resistance measurements allow you to: Make resistance measurements down into the milliohm (mΩ) range. This may be important when testing connectors, cables that will handle high currents, and cables used in high-reliability applications. Compensate for errors caused by test lead and test fixture resistance.