Constant current loop impedance measuring system that is immune

Details Constant current loop impedance measuring system that is immune Constant current loop impedance measuring system that is immune

1993-02-16

1994-12-06

Strecker, Gerard R.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324706, 324713, 324601, 324130, 73862628, G01R 2702, G01L 122, G01K 720

Patent

active

053714695

ABSTRACT:
A constant current loop measuring system is provided for measuring a characteristic of an environment. The system comprises a first impedance positionable in the environment, a second impedance coupled in series with said first impedance and a parasitic impedance electrically coupled to the first and second impedances. A current generating device, electrically coupled in series with the first and second impedances, provides a constant current through the first and second impedances to produce first and second voltages across the first and second impedances, respectively, and a parasitic voltage across the parasitic impedance. A high impedance voltage measuring device measures a voltage difference between the first and second voltages independent of the parasitic voltage to produce a characteristic voltage representative of the characteristic of the environment.

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patent: 4808914 (1989-02-01), Talmor
patent: 4841229 (1989-06-01), Eccleston
patent: 5122756 (1992-06-01), Nelson

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