Hallo!
we are trying to investigate the capability of the AD2 as entry level EIS device.
BUT we did not achieve to get reasonable results. The documentation does not help us much. So I ask here maybe someone could help us.
Which are the initial configurations for making the EIS electrochemical impedance spectroscopy of a Ltihium Ion cell?
In the attached Figure you can see the actual settings. Whereas in the attached PDF the actual hardware configuration without the Impedance Analyzer for Analog Discovery Adapter, which we did not fully understand its usage.
We were wondering how properly connect the ground, in particular if it is needed to connect to ground the Wavegenerator (the red line in the Picture).
We are not sure which mode would best suited (between Amplitude, constance voltage, constant current or custom), for instance for a lithium ion 20Ah cell (about 10Ohm internal resistance) we have tried many configuration (as described in §2.1 of https://reference.digilentinc.com/test-and-measurement/guides/waveforms-impedance-analyzer ), our last configuration is shown in PDF. We tried different modes, but the measurements seems not consistent. Usually, in our lab device, we define GEIS (Galvanostatic Electrochemical Impedance spectroscopy) with about 20mA so that we get an answer signal in the range of 0,4mV. Here GEIS or PEIS (Potentiostatic EIS) seems not working. Amplitude Mode is not clear what is does.
Additionally we are not sure the value of Off set that we have to use. Maybe 3,7V (the Open Circuit Voltage of the LiIon)?
Your feedback is welcome!
thanks in advance
Question
ees4all
Hallo!
we are trying to investigate the capability of the AD2 as entry level EIS device.
BUT we did not achieve to get reasonable results. The documentation does not help us much. So I ask here maybe someone could help us.
Which are the initial configurations for making the EIS electrochemical impedance spectroscopy of a Ltihium Ion cell?
In the attached Figure you can see the actual settings. Whereas in the attached PDF the actual hardware configuration without the Impedance Analyzer for Analog Discovery Adapter, which we did not fully understand its usage.
We were wondering how properly connect the ground, in particular if it is needed to connect to ground the Wavegenerator (the red line in the Picture).
We are not sure which mode would best suited (between Amplitude, constance voltage, constant current or custom), for instance for a lithium ion 20Ah cell (about 10Ohm internal resistance) we have tried many configuration (as described in §2.1 of https://reference.digilentinc.com/test-and-measurement/guides/waveforms-impedance-analyzer ), our last configuration is shown in PDF. We tried different modes, but the measurements seems not consistent. Usually, in our lab device, we define GEIS (Galvanostatic Electrochemical Impedance spectroscopy) with about 20mA so that we get an answer signal in the range of 0,4mV. Here GEIS or PEIS (Potentiostatic EIS) seems not working. Amplitude Mode is not clear what is does.
Additionally we are not sure the value of Off set that we have to use. Maybe 3,7V (the Open Circuit Voltage of the LiIon)?
Your feedback is welcome!
thanks in advance
AD2 for EIS configuration.pdf
Edited by ees4alladded a short note for better understanding the figure
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