Advanced science.  Applied technology.


Surface Resistivity Meter for Determining Surface Degradation of High Resistivity Materials


Apparatus and method for determining the amount of oxidative and hydrolytic degradation in the surface of a highly resistive material, such as a polymer. A special probe provides an annular resistance on the surface of a sample of the material. The voltage drop across the sample determines the input to a meter circuit. A guard circuit has an applied voltage that is substantially the same as the voltage at the meter circuit input. This circuitry permits a very low voltage source to be used.

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William A. Mallow;H. Stanley Silvus;Charles H. Parr;Jerome Dzuik, Jr.