Improved Calibration of Impedance Analyzers for Measurements on Highly Conductive Liquid

GROSSE, CONSTANTINO; TIRADO, MONICA

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT

IEEE

Lugar: Marshall, MN, USA ; Año: 2001 vol. 50 p. 1329 - 1333

0018-9456

An improved calibration method for low frequency dielectric measurements of conducting liquids using an Impedance Analyzer is presented. It consists in 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. 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 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 an Hewlett Packard HP 4192 A instrument.