Paper contains the analysis of two types of metrological polar - coordinate impedance simulators: with current control and with voltage control, and also of impedance meters realized on their basis. The synthesis of the impedance simulators circuits is considered, the stability study is carried out and the conditions of their optimal application in resonance meters of impedance components are defined. The structures of polar - coordinate impedance meters on the basis of series and parallel circuits with simulated resonance are designed and the optimal algorithm of their equilibration at measurement of impedance with any character of components: active, reactive or complex is offered. The offered devices have a high exactitude and simplicity of practical realization and are suitable for application both in simple and cheap automatic impedance meters, and in meters of a high exactitude.)