#9 - Measuring Resistance

Are you measuring resistance correctly?
The truth is, measuring resistance in a way that the measured value accurately reflects real physical characteristics is not as easy as it seems. We've collected a few questions worth paying attention to:

How many wires are you using for the measurement?
🔹For resistances above ~100 Ohms, a two-wire measurement provides adequate results.
🔹For resistances below ~100 Ohms or in precision applications, a four-wire measurement is recommended.

Are you multiplexing the signal?
🔹Make sure to multiplex all four wires in the case of a four-wire measurement.

Are you measuring a stable signal?
🔹After multiplexing, it's a good idea to wait for the measured values to stabilize.

Have you accounted for contact resistance?
🔹Every contact adds a series resistance of 10–100 mOhms, which cumulatively degrades the measurement.

In our own test setups, we use a variety of resistance measurement methods and tools every day. If you have any questions, feel free to contact us! 🤝

Download ResistanceMeasurement.pdf