Will AgCl or other reference electrode bias effect EIS data?
The DC reference potential will have no effect on the impedance data. The DC half cell voltages (displayed as Ref1 and Ref2 in the Data List) will however reflect a shift of 0.197V (for AgCl). The Bias Rejection in the 850e is -10 to 10V for the Ref1 and Ref2 signals and -25 to +25V for the Whole Cell voltage. When measuring impedance, it subtracts the existing DC voltage from the signal before passing the signal on to the FRA to be analyzed. The is redone for each data point, and in fact the bias rejection is performed separately for the Whole Cell, Ref1 and Ref2 voltages since these will have 3 different DC voltages. The Bias Rejection is also performed on the current signal because it typically has a large DC component which must be removed before the FRA receives the signal.
