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Generation of reference dc currents at 1 nA level with the capacitance-charging method

By Callegaro L., Capra P. P., D'Elia V. and Galliana F.

Abstract

The capacitance-charging method is a well-established and handy technique for the generation of dc current in the 100 pA rangeor lower. The method involves a capacitance standard and a sampling voltmeter, highly stable devices easy to calibrate; it is robust and insensitive to the voltage burden of the instrument being calibrated. We propose here a range extender amplifier, which can be employed as a plug-in component in existing calibration setups, and allows the generation of currents in the 1 nA range. The extender has been employed in the INRIM setup and validated with two comparisons at 100 pA and 1 nA current levels. The calibration accuracy achieved on a top-class instrument is 5E-5 at 1 nA

Topics: Current measurement, Calibrations, capacitance, Standards, Uncertainty
Year: 2014
DOI identifier: 10.1109/tim.2014.2298694
OAI identifier: oai:iris.inrim.it:11696/31481
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