Compensation for dielectric absorption effect
US5519328A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 1994 |
| Grant date | May 21, 1996 |
| Priority date | — |
| Expiry date | Oct 28, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R29/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.