Calibration of low-current meters at nA level with the capacitance-charging method

Luca Callegaro, Vincenzo D'Elia

Abstract

The most accurate generation of dc currents in the lower ranges is performed with the capacitance-charging technique. Implementations of the method are typically limited to an upper current in the 100 pA range. Here we present a range extender which can be employed as plug-in in existing setups. The extender permits to scale the current of a ×10 factor and reach the nA range. Results of calibration of low-current meters with and without the use of the extender are reported.

Keywords

low current, calibration, picoammeter, dc current, capacitance

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IMEKO-TC4-2013-016.pdf

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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