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Constant current loop impedance measuring system that is immune to the effects of parasitic impedances
Constant current loop impedance measuring system that is immune to the effects of parasitic impedances
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机译:恒定电流环路阻抗测量系统,不受寄生阻抗影响
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摘要
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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