I need to build a device to measure the impedance in AC, at various frequency (100Hz - 100KHz), with the quadrupole method.
No, I have quite a good understanding of the principle behind the this kind of measurements. What I have some problem with is the construction of the setup i'm gonna need beside the 4-pin probe itself.
I guess I'm gonna need a AC current generator (right?) but what is necessary to acquire the data and be able to plot them both in a Bode representation (|Z| vs. freq and PhaseAngle vs. freq) and in Nyquist representation (-Im(Z) vs. Re(Z)).
This is really a little be outside my field of study so please, kindly elaborate :)