I am using the EVAL AD5933EBZ evaluation board with a resonance PZT sensor. I also used an Agilent impedance analyzer to compare the results. The impedance graph obtained is the same for both tests. But surprisingly, the maximum admittance (minimum admittance) is not occuring at the same frequency. I am using a calibration resistor of 30k ohms which is in the middle of the results obtained with the Agilent.
What are your suggestions I can do to obtain the same results?
I thank you in advance.