Compensation for dielectric absorption effect

Details Compensation for dielectric absorption effect Compensation for dielectric absorption effect

1994-10-28

1996-05-21

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324659, 324677, 327362, 327341, G01R 2726, H03K 500

Patent

active

055193285

ABSTRACT:
Apparatus is provided for continuously compensating for the dielectric absorption effect in a measuring capacitor in a circuit which employs means for charging the capacitor to develop an output signal thereacross and wherein the absorption effect causes an error in the output signal following a charging interval. The dielectric absorption effect is represented by at least one impedance branch connected in parallel with the capacitor and this branch includes a resistor and a capacitor connected together in series and having a RC time constant. Compensating means is provided having a correction means associated with the impedance branch and wherein the correction means continuously receives the output signal and provides therefrom a compensating signal. The correction means has a time constant that corresponds with that of the associated impedance branch. The compensating signal is combined with the output signal to provide a compensated output signal.

REFERENCES:
patent: 2745007 (1956-05-01), Thomas
patent: 3047808 (1962-07-01), Gray
patent: 4023097 (1977-05-01), Hanashey
patent: 4211981 (1980-07-01), Lerma
patent: 4213348 (1980-07-01), Reinertson et al.
patent: 4365204 (1982-12-01), Haque
patent: 4377759 (1983-03-01), Ohhata et al.
patent: 5144307 (1992-09-01), Takatsuka
IEEE Transactions on Circuits and Systems tehcnical article entitled "A Wide-Range Logarithmic Charge Digitizer", vol. 40, No. 5, dated May 1993.

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