Why Use Sense Resistors in 4-Wire Kelvin Measurements?

Thread starter Tweedle_Dee
Start date Jul 1, 2010
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Kelvin Measurements Resistors

AI Thread Summary

Sense resistors in a 4-wire Kelvin measurement system are crucial for accurate voltage readings, as they help eliminate the effects of lead and contact resistances. By ensuring that the sense lines carry minimal current, they prevent voltage drop that could skew measurements. The sense resistors are typically placed in the measurement circuit to detect the voltage across the test resistance without interference from the current-carrying leads. This configuration allows for precise determination of the test resistance by measuring the voltage drop accurately. Overall, sense resistors enhance measurement accuracy in low-resistance applications.

Jul 1, 2010

Tweedle_Dee

In a 4-wire (kelvin) measuring system, why are there "sense" resistors? I understand that because there is very little current on the sense line there is no voltage drop. What purpose do they serve?

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Jul 1, 2010

waht

Where are the sense resistors exactly? In a Kelvin 4-probe you run a constant current through a test resistance and then measure voltage drop across it.

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