Volume and Surface Resistivity Measurements of Insulating Materials

The resistivity of an insulator is measured by sourcing a known voltage, measuring the resulting current, and calculating the resistance using Ohm’s Law.  Measuring insulators involves very low currents, which require special techniques to ensure accuracy and repeatability. This application note covers making volume and surface resistivity measurements of insulating materials, using an electrometer, as well as tips on how to ensure test system safety.