Process and circuit arrangement for measuring the resistance of

Details Process and circuit arrangement for measuring the resistance of Process and circuit arrangement for measuring the resistance of

1995-02-24

1997-02-04

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324712, 324694, 324678, 324677, 318DIG2, G01R 2714

Patent

active

056002548

ABSTRACT:
In a process and a circuit arrangement for measuring the resistance of a resistance sensor, for instance a wetness sensor, via a rate of change of the charge of a capacitor, a measurement cycle consisting in each case of a charging of a capacitor, a discharging of the capacitor over the resistance sensor, and thereupon a measurement of the charge remaining in the capacitor, the direction of the discharge current through the resistor changes from measurement cycle to measurement cycle.

REFERENCES:
patent: 3495164 (1970-02-01), Dauphinee
patent: 3757205 (1973-09-01), Dauphinee
patent: 4786875 (1988-11-01), Carll
patent: 5439644 (1995-08-01), Gramkow

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