Evaluation of the fast impedance spectroscopy method in the laboratory measurement system

In this paper the method for fast impedance spectroscopy of technical objects with very high impedance (|Z_x| ≥ 1 GΩ) is evaluated by means of simulation and practical experiment. The method is based on excitation of an object, with a square pulse and measurements of voltage and current responses with DAQ card. The object impedance spectrum is obtained with use of continuous Fourier transform. Some improvements of the method concerned on sampling moments optimization are discussed. The method is evaluated in Matlab by means of simulation and then practically verified on constructed laboratory impedance spectroscopy measurement system.