Optimization of impedance measurements using ‘chirp’ type perturbation signal

The paper presents a novel method of impedance measurements using the non-stationary ‘chirp’ signal. Variable sampling frequency has been employed in a process of acquisition of the voltage perturbation and current response signals. Such solution allows significant decrease in a number of data necessary to obtain an impedance spectrum as well as simplification and acceleration of the calculation process. It has been found that an accuracy of the results obtained with this method was directly proportional to the frequency resolution, with which impedance values were obtained.