Advanced science.  Applied technology.


Surface Resistivity Meter for Determining Surface Degradation of High Resistivity Materials: 5,486,768


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: 
Date Of Issue: 

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