METHOD OF CALIBRATING CHARGE AMPLIFIERS USING A DYNAMIC SPECTRUM ANALYZER

Seung-Hwan Nam, Yong-Bong Lee, Wan-Sup Cheung

Abstract

This paper proposes a simple and salient method of calibrating the charge amplifier required for the primary and/or comparison calibration of vibration and shock transducers. The proposed method exploits the ‘sinesweep’ measurement for evaluating the frequency response function (FRF) between the input and output signals using a dual-channel dynamic spectrum analyzer. The principle and theoretical model for the calibration of charge amplifiers are presented. The uncertainty evaluation models for the gain and phase shift are described. Experimental results unveil that the standard uncertainties of the gain and phase shift are less than 0.035 % and 0.05° over the frequency range of 1 Hz to 10 kHz. Compared to the previous methods, one of the salient features of the proposed method is a simple calibration setup consisting of the standard air capacitor and the spectrum analyzer.

Keywords

charge amplifier, accelerometer, standard capacitor, vibration calibration

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IMEKO-WC-2012-TC22-P3.pdf

DOI

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IMEKO TC

TC22 - Vibration Measurement

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