Method for characterizing an electrical system by impedance spectroscopy

A method for characterizing an electrical system including the following steps:

• applying an input signal to said electrical system that comprises a sequence of sinusoidal current or voltage perturbations, around a polarization point of said electrical system, each disruption having a different frequency belonging to a primary series (A) of frequencies;
• measuring an output signal of said electrical system in response to said input signal for each of said applied perturbations;
• estimating a characteristic size of the impedance of said electrical system for each of said applied perturbations, the set of said estimates of the characteristic size of the impedance characterizing said electrical system,
• wherein the perturbations of said sequence are applied so as to scan, turn by turn, a plurality of sub-series (A1, . . . , An) of frequencies resulting from said primary series (A), each sub-series of said plurality being interlaced with at least one other sub-series of the same plurality.