Use of a 100 MΩ step Hamon resistor for calibration of pico-ammeters in dc current in the range 100 pA ÷ 100 nA

Pier Paolo Capra, Flavio Galliana, Milena Astrua, E. Gasparotto

Abstract

This paper describes a measurement circuit for the calibration of pico-ammeters in dc current. The system is based on a 100 MΩ Hamon network developed at INRIM to improve the traceability level of the maintained 1 GΩ standard. Besides the Hamon network, the measurement system, presented in this paper, consists of a precision dc voltage source and an electronic circuit used as voltage guard driver.

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IMEKO-TC4-2007-012.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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