Several conditions are required to measure the electrochemical impedance of a system. Its behaviour has to be linear, invariant vs. time and the system 首ld be in a steady state. Indeed, if the steady state is not reached by the system, the electrochemical impedance signal used to calculate the Fourier Transform is not periodic. Moreover the presence of transient period due to the excitation step implies into the result spectrum a contribution to the response of the imposed sinusoid. VMP3多通道電化學(xué)工作站-16通道