One of my colleagues said, "the impedance you can measure with the three electrodes and with the specific sequence varying the frequency"
Is it possible to configure the potenciostat without the FRA module, with these settings? If so, how could I do that?
The specific sequence varying the frequence needs the FRA module. But it is not commonly a separate module. Verify if EIS is an active method in the software of your potentiostat. If so, the "module" is inside the potentiostat.
Years ago I usually did that using an analogue potentiostat, a function generator and a plotter to draw the E/I Lissajous pattern for each frequency. Today you can use a data acquisition card to do the work: polarizing the cell through the potentiostat and recording the E/I output.
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