The object of research: measurement of the parameters of electrical impedances and, using impedance sensors, of the non-electric physical quantities. The purpose of research: the development of theoretical foundations, the development of new principles for construction of the unificated means for measuring of the electrical impedance and other physical quantities on their basis with higher metrological and technical and economic characteristics. Methods of research: structural-algorithmic methods for increasing the accuracy and expanding of the functionality of electrical measuring instruments, information theory of measurement, theory of signals and circuits, error theory, analytical and physical modeling, methods for calculating of the electric circuits, experimental methods of research and developments.Theoretical and practical results and innovations: the dissertation solves the combined problem of creating a scientific base for the development of more perfect and competitive unified means for measuring parameters of electrical impedance with wide functional capabilities for solving new science-intensive tasks, which combine simplicity, processability and low cost, small size and energy efficiency with precision, wide range, sensitivity and high-resolution measurements at low levels of test signals. The methods of measuring of the impedance parameters were further developed on the basis of applying their direct transformation in combination with the partial balancing of the new kind of alternating current bridge circles. The functionally full set of specialized and universal measuring circuits and effective methods of their calibration have been developed. The theoretical foundations of the constructing are developed and metrologically reliable differential meters with thermistor, capacitance and conductometric transducers for biosensor systems are created. A subject and degree of introduction: The main results of the work in the form of technical documentation and samples of the devices were implemented at the NPF "Eleksystemles", Kyiv, VO "Electropribor", Kyiv, at the Institute of Molecular Biology and Genetics of the National Academy of Sciences of Ukraine, DP NVC "Energoimpuls" IED of the National Academy of Sciences of Ukraine.Effectiveness of implantation: Significant simplification of circuits, device designs and measurement algorithms have been achieved without loss of accuracy and speed. Increased efficiency of the use of informative signals and the sensitivity of the measurement channel, measurement speed and discretness of collected data have been achieved. Metrologically reliable differential meters with thermistor, capacitance and conductometric transducers for biosensor systems are created. Sphere of use: the instruments for operational measurements, information and measurement systems for monitoring, diagnostics, control of technological processes in the power engineering, other branches of the industry and in the medicine, analytical researches in the medical and biological branches.
