HIGH IMPEDANCE MEASURING OF ANTI-CORROSION COATINGS

J. Hoja, G. Lentka

Abstract

The paper deals with problems of very high impedance (|<i>Z</i>| < 10 G&Omega;) measurements in a wide frequency range (10^-5 ... 10⁶ Hz). The measurements are aimed to identify electrical parameters of different anti-corrosion coatings. The construction of the measuring system designed for monitoring the anti-corrosion coatings effectiveness on various types of technical objects is presented. The circuit solutions analysed refer, in particular, to the input adapter, the measuring signal generator, and the phase-sensitive detector. The test results of the whole measuring path are shown and some parameters determining low and high band of the system frequency range are pointed out.

Keywords

impedance measurement, equivalent circuit, anti-corrosion coatings

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IMEKO-WC-2000-TC4-P132.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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