Improved calibration of impedance analyzers for measurements on highly conductive liquids

Author

Grosse, Constantino ; Tirado, Mónica

Author_Institution

Departamento de Fisica, Univ. Nacional de Tucuman, Argentina

Volume

50

Issue

5

fYear

2001

fDate

10/1/2001 12:00:00 AM

Firstpage

1329

Lastpage

1333

Abstract

An improved calibration method for low-frequency dielectric measurements of conducting liquids using an impedance analyzer is presented. It consists of representing the instrument as an electric quadrupole and performing three calibrations over the whole frequency range. These calibrations consist of short, open, and a reference load whose impedance is similar to that of the unknown sample. The reference load consists of the sample cell filled with an electrolyte with known dielectric properties. This method allows a differential measurement of the dielectric properties of the unknown liquid with far higher precision than what is possible using the standard calibration method. It proved useful for measurements on suspensions of up to 0.8 S/m conductivity at frequencies down to 10 kHz using the Hewlett Packard HP 4192 A instrument

Keywords

calibration; electric impedance measurement; measurement errors; permittivity measurement; 10 kHz; conducting liquids; differential measurement; electric quadrupole; equivalent circuit; impedance analyzer; improved calibration method; load calibration; low-frequency dielectric dispersion; low-frequency dielectric measurements; reference load; suspensions; Calibration; Conducting materials; Conductivity measurement; Dielectric liquids; Dielectric measurements; Electrodes; Frequency measurement; Impedance measurement; Instruments; Permittivity measurement;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.963206

Filename

963206