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Surface Resistivity Meter for Determining Surface Degradation of High Resistivity Materials

Abstract: 

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.

Patent Number: 
5,486,768
Date Of Issue: 
01/23/1996
Inventors: 

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