RESONANCE MEASUREMENT OF THE INDUCTANCE Q-FACTOR IN ULTRAACOUSTIC FREQUENCY RANGE UTILIZING IMPEDANCE ANALYSER

Radek Sedlácek, Luca Callegaro, Francesca Durbiano

Abstract

Assignment of the inductance Q-factor is given by the determination of equivalent circuit parameters of the measured inductor or the Q-standard. In case of serial equivalent circuit, values of the inductance LS and the resistance RS have to be evaluated. Conventional precious bridges routine used for inductance and resistance measurements typically work up to some hundreds of kHz. For higher frequency ranges these methods are not available to apply for finding both parameters inductance LS and resistance RS. <br /> This paper describes a method based on utilizing resonance technique for inductance Q-factor measurement. The measured inductor and auxiliary capacitor form the resonance circuit. Impedance of this circuit is measured by means of an impedance analyser in suitable wide frequency range around the desired frequency. Subsequently mathematical data processing is applied to improve results obtained from the impedance analyser. This method has been developed for calibration of Q-standards designed for ultra-acoustic frequency range (typically hundreds of kHz up to tens of MHz).

Keywords

inductance Q-factor, impedance analyser

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PWC-2003-TC4-046.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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