The PMUX-P is configured for sequentially measuring through up to 16 segments of segmented electrodes, e.g., of a fuel cell. For that application, a PP series potentiostat or an EL series electronic load is used for loading all segments except the one which is measured. The measurement is done by the internal ZENNIUM potentiostat. The software carries out sequential measurements through all segments of the fuel cell. With one PMUX-P these are up to 16 segments. Up to 4 PMUX-P modules can be stacked for a total of up to 64 segments. Both, the PP/EL and the ZENNIUM potentiostat have to be connected to the PMUX-P.