SYSTEM AND METHOD TO CHARACTERIZE THE PERFORMANCE OF ELECTRICAL STORAGE SYSTEMS

A testing system for performing Electrochemical Impedance Spectroscopy on a Unit Under Test (UUT) includes a function generator configured to apply a plurality of frequency components combined in a single burst or broadband stimulus to the UUT, and an oscilloscope having one or more processors configured to measure an amplitude ratio and phase difference between a voltage and a current of the UUT at a plurality of frequencies after the single burst or broadband stimulus of frequency components has been applied, generate a Nyquist plot of impendence values in both real and imaginary axes from the measured phase difference, and present the Nyquist plot at an output of the oscilloscope. Methods of operation are also described.