Kursin S. Precision universal comparators impedance, based on the variational error calibration.

The object of research: the process of comparison parameters of impedance in autotransformer bridges. The purpose of research: improve the accuracy and range of values and frequency precision comparison impedances. Methods of research: To achieve the objectives of the thesis used a method of analysis of linear circuits, the apparatus of mathematical analysis, analog and digital simulation measurement circuits and algorithms for variational calibration. Theoretical and practical results and innovations: the first time the combined method of eliminating the influence of "yoke" in autotransformer bridges based on the use of double-circuit the measuring range, measuring two imbalance signals and analog compensation voltage drop on the connecting cables. A method to establish the exact phase shift in the frequency range for simultaneous regulation of two complex transfer factors - phase shifter and calibration circuit the module and phase of the analysis of only one signal imbalance. First developed and studied mathematical models of variations universal calibration autotransformer bridge-comparators. First analysis comparison two impedances with arbitrary values of module and phase shift for arbitrary equivalent circuit of compared impedances and different directions transfer of the impedance parameters, made it possible to simplify the structure of the comparators, improve accuracy and reduce the size and weight. A subject degree of introduction: Effectiveness of implantation: used at the State Enterprise "Ukrmetrteststandard", Republican Unitary Enterprise " Belorussian State Institute of Metrology", National Institute of Standards and Technology, USA. Sphere of use: serial precision measuring instruments for use in upper levels of the hierarchy scheme in impedancemetry.