#10 - Insulation Resistance Measurement

Insulation Measurement, or Resistance in the Gigaohm Range

General-purpose measuring instruments are no longer suitable for measuring resistances of this magnitude, so special insulation testers must be used. This raises the question: what makes these instruments different from their general-purpose counterparts?

Here are a few examples:

🔹They typically excite the resistance with a current-limited voltage generator.
🔹The test voltage can range from several hundred volts to a few kilovolts.
🔹The low current flowing through the resistance under test is converted to voltage using either a high-side or low-side shunt.
🔹If the resistance breaks down, the instrument shuts off the output, protecting both itself and the DUT (Device Under Test).
🔹From a safety perspective, a key feature is the ability to safely discharge dangerous voltages.
🔹They can operate with both DC and AC excitation.

If you're interested in more details about insulation measurement, or if you'd like to perform insulation testing in an automated way, feel free to contact us! 🤝

Download InsulationMeasurement.pdf