Hello,

I developed system for complex impedance measurement based on CN-217 and I have non linearity problem in inductance measurement. What is maximum reactance which can be attached as load on AD8606 or there is problem with AD5933 in "pure inductive" load? Attached inductance is 50 mH.

Please find attached picture with results where may be seen and value of feedback resistor. This value is changed according to value of impedance under test.

Hi,

what do you mean by non-linearity issues? Could you show an example

Say that, measure a capacitor or inductor directly could generate stability issues in the opamp due to the imaginary component.

Just to verify that this is not the case, May you place a 100ohms series resistance between your impedance and the first opamp?

Best Regards,

Miguel