Capacitance measuring circuit

Details Capacitance measuring circuit Capacitance measuring circuit

1986-12-03

1988-04-12

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

34087037, G01R 2726

Patent

active

047377062

ABSTRACT:
In a remote capacitance measuring circuit comprising an oscillator circuit, the capacitance (C.sub.T) to be measured forms a link of a series connected frequency-determining impedance set (R.sub.T, C.sub.T). This is connected to the oscillator circuit only at its end terminals, one end terminal (G) being connected to a constant voltage, while the other end terminal (H) is connected to a point (2) of the oscillator circuit, where this maintains a constant voltage in each half-cycle. The oscillator circuit senses the charging current flowing to the capacitance (C.sub.T) and is triggered at the moment when the charging current has dropped to a predetermined value. Influence of the stray and input impedances (C0) on the oscillator frequency, which is representative of the subject capacitance, is avoided.

REFERENCES:
patent: 3581196 (1971-05-01), Spaid
patent: 3716782 (1973-02-01), Henry
patent: 3863147 (1975-01-01), Erath

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