Application Note Volume and Surface Resistivity ...

Volume and Surface Resistivity Measurementsof insulating Materials Using the Model 6517 AElectrometer/ high Resistance MeterIntroductionA fundamental property of insulators is Resistivity . Theresistivity may be used to determine the dielectric breakdown,dissipation factor, moisture content, mechanical continuity andother important properties of a material. The Volume resistivityof some insulators, such as sapphire and Teflon , can be as highas 1016 to 1018 ohm-cm. Because of such large magnitudes,measuring the Resistivity of insulators can be difficult unlessproper test methods and instrumentation are used. One testmethod often used for measuring Resistivity of insulators isASTM D-257, DC Resistance or Conductance of InsulatingMaterials. Instruments called electrometers are used to make thismeasurement because of their ability to measure small and TechniquesThe Resistivity of an insulator is measured by sourcing aknown voltage, measuring the resulting current, and calculatingthe resistance using Ohm s Law.

Volume and Surface Resistivity Measurements of Insulating Materials Using the Model 6517A Electrometer/High Resistance Meter Introduction A fundamental property of insulators is resistivity.

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