MD628Y - Method for measuring the impedance components - Google Patents

Abstract

The invention relates to the field of electrical and electronic measurements and can be used for high-precision measurement of impedance components.The method for measuring the impedance components consists in the formation of a resonance series measuring circuit, consisting of the measured object, output terminals of the impedance converter with separate control of module and phase of the reproduced impedance, and with predefined values of the module and phase of the reproduced impedance, equal respectively to the maximum value of the control range and 180°, supply of the measuring circuit with a measuring signal, formation of a disequilibrium signal as a result of interaction of the measuring circuit with the measuring signal, formation of a reference signal with the same phase as the impedance reproduced by the converter, equilibration of the measuring circuit by controlling the components of the impedance reproduced by the converter, including the phase in the value range of 90…270°, and determination of components of the unknown impedance from their dependence on the input variables of the converter. It is additionally formed a second reference signal, with the phase equal to the phase of the current measuring circuit. The equilibration of the measuring circuit is carried out by simultaneous control of the module of the impedance reproduced by the converter up to the attainment of a phase shift equal to 90° between the disequilibrium signal and the second reference signal and the phase of the impedance reproduced by the converter up to the attainment of the value of the phase shift between the disequilibrium signal and the first reference signal equal to 0° or 180°, and the equilibration process stops upon attainment of the zero value of the disequilibrium signal module.