Apparatus and method determining the value of a capacitance

Electricity: measuring and testing – Conductor identification or location – Inaccessible

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G01R 1152, G01R 2726

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active

045582742

ABSTRACT:
An apparatus useful in determining the value of a capacitor includes a first bilateral switch for flowing a charging current through a resistive element to an initially-depleted first capacitor of known value. The first capacitor is thereby charged to the potential of a trigger reference over a resulting first time period. A second bilateral switch is provided for flowing a charging current through the same resistive element to an initially-depleted second capacitor, thereby charging it to the potential of the same trigger reference over a resulting second time period. A device such as an oscilloscope or frequency counter is used for determining these time periods and the value of the unknown second capacitor may thereupon be computed using disclosed formulas.
A method for determining the value of a capacitor includes the steps of flowing a charging current through a resistive element to an initially-depleted first capacitor of known value, thereby charging this capacitor to the potential of a trigger reference over a resulting first time period. A charging current is then caused to flow through the same resistive element to an initially-depleted second capacitor for charging it to the potential of the trigger reference over a resulting second time period. The value of the second capacitor is then computed by utilizing the first time period, the second time period and the value of the first capacitor.

REFERENCES:
patent: 3824459 (1974-07-01), Uchida
patent: 4065715 (1977-12-01), Jaffe et al.
patent: 4227419 (1980-10-01), Park
patent: 4492916 (1985-01-01), Johnson

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