I'm trying to make a Nyquist diagram based on experimental data obtained with frequency, output, input respectively in excel for the system.
Unfortunately I couldn't get any help with this problem so far and I haven't found anything relevant online.
I have 3 values containing the collected data (frequency in Hz, output V, input V). Is there a method to plot the Nyquist diagram using the experimental data and not by the transfer function method where Matlab can generate a Nyquist plot from my data obtained.
Nyquist plot:
I dont understand why the plot has 2 graphs individually and maybe my sequence of (Frequency, output, input) in excel is wrong?
If it has to be done manually, then how should I approach this?
Any explanation, sample code, or perhaps links would be greatly appreciated.
Circuit:
