The electrochemical impedance spectrometer "EIS-Meter" is extended by a synchronous 12-channel analyzer. This further development enables the simultaneous, synchronous measurement of the impedances of up to 12 cells or cell groups within a stack. This enables time-synchronized acquisition of the impedance spectra of several cells in a fuel cell or electrolysis stack. The synchronized measurement of individual cells enables a more detailed analysis of the dynamic operating conditions within the stack. Important conclusions can be drawn, particularly in the event of load changes or when starting up and shutting down the system. The flexible measurement channels can be positioned anywhere on the stack. Even with high stack voltages, it is possible to precisely determine very low individual impedances.
