AN ACCURATE COMPARISON OF HIGH-OHM RESISTANCES USING IMPROVED DVM-BASED SYSTEM

Ivan Lenicek, Roman Malaric, Alan Šala

Abstract

For purpose of accurate resistance standards comparison a digital voltmeter (DVM) based method has been designed and realized. When measuring resistance standards greater than 100 MΩ capabilities of the method are restricted due to influence of DVM's input parameters: input resistance, input offset current and input capacitance. The measurement system for resistance comparison based on two DVMs has been improved using simple electrometer transconductance amplifier that interfaces digital voltmeter with the measuring circuit. Analysis of influence of electrometer's parameters, realization of the electrometer device and calibration of the system has been presented in this paper. Described measurement system has been merged in resistance traceability chain of Primary Electromagnetic Laboratory (PEL) within the Faculty of Electrical Engineering and Computing of the University of Zagreb, thus participating in building of high-ohm resistance standard base up to 1 TΩ.

Keywords

high-ohm resistance comparison, electrometer

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PWC-2003-TC4-094.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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