Capacitance measuring device

Details Capacitance measuring device Capacitance measuring device

G - Physics

01

R

324/44

G01R 27/26 (2006.01) G01R 19/252 (2006.01)

Patent

CA 1099340

ABSTRACT OF THE DISCLOSURE Capacitance measuring device for measuring a physical quantity proportional or inversely proportional to the capacitance X of a first capacitor. A oscillating circuit includes a second capacitor having a reference capacitance XE or the first capacitor during successive reference and measuring phases under control switching network respectively. A counter counts a predetermined oscillation pulse number NE during the reference phase and a oscillation pulse number NX during the measuring phase, The duration of two phases are equal or in a predetermined ratio R by means of a counter-down-counter which counts and down-counts the same num- ber of clock pulses at least a predetermined frequency. The change of the counting to down-counting condition is controlled by the counter when its count is equal to NE. The stopping of the counter is controlled by the counter-down-counter when its count is equal to zero at the end of the measuring phase. A displaying and computing unit computes the physical quantity in dependance on the capacitance value X = (NE XE) / (R Nx) which is not affected by the drifts of device components and interference capacitances.

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