I am trying to implement LISN in PLECS. I could model V-LISN circuit diagram in Plecs but facing issue in measuring CM and DM noise in frequency domain.
Please suggest ways to see CM and DM noise in frequency domain.
You can open the Fourier view of a PLECS Scope. This section of the PLECS Help describes the available settings for the Fourier Analysis window.
For the purpose of analyzing CM and DM noise some users may find the current interface limiting. A more flexible alternative would be to export the scope data and process the trace in a separate tool such as Python or MATLAB where you have the option for custom measurement techniques, plotting, and results comparison.