3 electrode EIS measurement using AD5940 EVAL ELCZ

Hi,

The switch settings may be

.DswitchSel = SWD_CE0,
.PswitchSel = SWP_RE0;
.NswitchSel = SWN_AIN1|SWN_SE0;
.TswitchSel = SWT_AIN1|SWT_AFE3LOAD;

Thank you Akila
The switch settings worked
Do you know how to set VBias and VZero separately ?
I was able to change BiasVolt values but i couldn't find a way to change Vbias and Vzero. 

Hi,

Vzero is set by 

AppIMPCfg.Vzero 

Hi,

AppIMPCfg.Vzero  does not exist in Impedance.c and AD5940_Impedance project 

Could you please check into this?

Hi,

Can you search for AppIMPCfg.Vzero in Impedance.c

Hi ,

I did 

Hi,

I could find it here:

Hi,

I think we both have 2 different version of Impedance.c . The one i have was downloaded from AD5940_example github.. Could you share your version ?

Hi,

I am referring to 

ad5940-examples/Impedance.c at master · analogdevicesinc/ad5940-examples · GitHub

Hi,

Thank you for that link.

For our experiment we have to measure RzMag and RzPhase for a 3 electrode system

Problem : The phase values must be in the range of 0 to -90 degrees , but the phase values were going shooting up and down going out of bounds.

What can we do to get phase values within the range?

I have added the settings we used below

The outputs obtained from AD5940 EVAL ELCZ are

The Nyquist plot for the above table 

The Expected Nyquist Plot (Obtained from electrochemical Workstation)