MD3577F1

MD3577F1 - Method of measuring the impedance components

Info

Publication number: MD3577F1
Application number: MDA20060234A
Authority: MD
Inventors: Vitalie Nastas; Victor Cojocaru
Original assignee: Universitatea Tehnica A Moldovei
Priority date: 2006-09-21
Filing date: 2006-09-21
Publication date: 2008-04-30
Also published as: MD3577G2

Abstract

Inventia se refera la domeniul masurarilor electrice si electronice si poate fi utilizata pentru masurarea cu precizie inalta a componentelor impedantei. Esenta inventiei consta in formarea unui circuit de masurare cu rezonanta in serie din obiectulmasurat, contactele de iesire ale unui convertor de impedanta si un generator de semnal, controlul semnalului de dezechilibru format din caderea sumara de tensiune pe obiectul masurat si circuitul deiesire al convertorului; echilibrarea circuituluide masurare prin reglarea impedantei reproduse deconvertor si determinarea componentelor impedantei masurate. Controlul semnalului de dezechilibru se efectueaza prin compararea fazei lui cu faza unui semnal de referinta produs de convertor, faza caruia coincide cu faza componentei reactive a impedantei reproduse de convertor, reglarea careia se efectueaza prin intermediul reglarii independente acomponentelor activa si reactiva. Echilibrarea circuitului de masurare se efectueaza in doua etape:la prima etapa se regleaza componenta activa a impedantei reproduse de convertor pana la obtinerea unui defazaj de 180° intre semnalul de dezechilibru si semnalul de referinta, iar la etapa a doua seregleaza componenta reactiva a impedantei reproduse de convertor pana la trecerea defazajului sus-numit de la valoarea 180° la valoarea 0°. Rezultatul inventiei consta in elaborarea unei metode de masurare a componentelor impedantei care permite echilibrarea circuitului de masurare in doua etape, ceea ce conduce simplificarea algoritmului masurarii si la largirea domeniului de utilizare.The invention relates to the field of electrical and electronic measurements and can be used for high precision measurement of impedance components. The essence of the invention consists in the formation of a measuring circuit with series resonance from the measured object, the output contacts of an impedance converter and a signal generator, the control of the imbalance signal formed by the voltage drop on the measured object and the output circuit of the converter; balancing the measurement circuit by regulating the reproduced impedance of the converter and determining the components of the measured impedance. The control of the imbalance signal is performed by comparing its phase with the phase of a reference signal produced by the converter, the phase which coincides with the phase of the reactive component of the impedance reproduced by the converter, the adjustment of which is carried out through the independent adjustment of the active and reactive components. The balancing of the measuring circuit is performed in two stages: in the first stage, the active component of the impedance reproduced by the converter is adjusted until a 180 ° phase difference is obtained between the imbalance signal and the reference signal, and in the second stage the reactive component of the reproduced impedance is adjusted. from the converter until the above mentioned phase shift from 180 ° to 0 °. The result of the invention consists in the elaboration of a method of measuring the impedance components that allows the balancing of the measurement circuit in two stages, which leads to the simplification of the measurement algorithm and to the widening of the field of use.