Three electrode measurement for AD5933?

Hi everybody,

 

we're using the AD5933 for bioelectrical electrode impedance measurements. Usually, the electrodes have to be immersed in a saline solution for measuring, and a 2 point measurement (Electrode to Reference electrode) adds unwanted potential offsets to the measurement. For a more accurate measurement, a technique using 3 electrodes is employed:

 

(Fig. 4 from this link)

Ralph Group : projects : Fabrication and characterization of graphene electrodes for electrochemistry experiments

Figure 4

Is there any way to connect the AD5933 in such an arrangement to measure impedance? Do you have any additional suggestions for performing such a measurement?

 

Thanks and Kindest Regards,

Oscar Cota