Lameko A. Dimensionless calibration variation in ac bridges.

Target of research – the process of measuring of impedance parameters in precision bridge circuits of periodic current. Research objective – the development of variation methods for correction of errors of measuring circuits, where the improvement of the accuracy is not accompanied by an increase in complexity of the equipment and the measurement time (or the changes are fractional). Research methods - linear circuit analysis, complex variable theory, mathematical tools of incremental and integral analysis, analog and digital simulation of measuring circuits and algorithms of dimensionless calibration variation, in-depth experimental study of metrological characteristics of apparatus to define the compliance in-between theoretical and developed apparatus. Research recency and its theoretical and practical results – the development of a new method of variation calibration, i.e. dimensionless variation calibration; the development of new models and algorithms of dimensionless calibration variation of the basic functional parts of measuring circuits (voltage ratio and current dividers, voltage and current inverters, phase-shifters, transmission lines – measuring cables); the development of new models and algorithms of dimensionless calibration variation of two-channel vector voltmeters. Subject of research and its implementation – the results of the research have been used in the developing such products as: Precise informational measuring system CA – 5100, that has been passed to DP (State-run enterprise) “Ukrmetrteststandart” and listed on National capacitance and loss tangent standards as comparative and transfer instrument; Multichannel precise informational measuring system CA – 320 has passed state tests and is being supplied to CIS and non-CIS countries, besides, has been listed on temperature standards of Turkey and Kazakhstan; Precise thermal conductivity device TK – 4100 is ready to pass state tests. Implementation effectiveness Results of the thesis provided the basis for development of a number of commercially available complex impedance parameter meters, as well as to create instrumentation used in the primary standards of the complex impedance. Sphere of usage The results obtained with respect to methods and algorithms for correction of measurement errors are recommended for use in the design of workstations Metrology and instrument-making industry.