Nyquist plot from experimental data

I'm trying to make a Nyquist diagram based on experimental data obtained with frequency,output,input respectively as attached 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 ploy the nyquist diagram using the experimental data and not by the transfer function method wher Matlab can generate a nyquist plot from my data obtained.

I dont understand why the plot have 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.

Answer 1

[Star Strider]

‘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.’

From the documentation for the nyquist function:

• nyquist creates a Nyquist plot of the frequency response of a dynamic system model. (emphasis mine)

So in a word, no.