Surface resistivity meter for determining surface degradation of

Details Surface resistivity meter for determining surface degradation of Surface resistivity meter for determining surface degradation of

1994-05-31

1996-01-23

Regan, Maura K.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324715, 324724, 324688, G01R 2702

Patent

active

054867681

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.

REFERENCES:
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patent: 3048776 (1959-06-01), Logan
patent: 3147430 (1962-02-01), Greenler
patent: 4446424 (1984-05-01), Chatanier
patent: 4546310 (1985-10-01), Chatanier
patent: 4724376 (1988-02-01), Slough et al.
patent: 4758777 (1988-07-01), Bossard et al.
patent: 4962360 (1990-10-01), Homma et al.
patent: 5093626 (1992-03-01), Baer

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