Basic measuring module for implementation of the high-precision devices for determining the impedance parameters in a wide frequency range - V. H. Melnyk; P. I. Borshchov; V. K. Bieliaiev; O. D. Vasylenko; O. L. Lameko; O. V. Slitskyi (Proceedings of the Institute of Electrodynamics of the National Academy of Sciences of Ukraine, 2020)