Precise and Rapid Measurements of Small Currents from High Impedance Sources

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Abstract
A control unit has been designed which together with standard electronic equipment enables the repeated and precise measurement of average current through the measurement of the time required to accumulate a given charge on a capacitor. Charges of 10 nC are measured with a precision considerably better than 0.01% and an accuracy better than 0.1%. Measurement times longer than 5 sec are used and a typical application is the measurement of ionization currents between 10 and 1000 pA.

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