In MATLAB R2018b there is not a way to directly export the FFT analysis from the graphical interface opened from the Powergui block.The workaround is to use command line tools to obtain the desired data in the base workspace:
1. Get initial default structure:
FFTDATA = power_fftscope(ScopeData);
2. Modify FFTDATA structure to have desired options and settings, e.g.
FFTDATA.cycles = 10;
FFTDATA.fundamental = 50;
FFTDATA.maxFrequency = 500;
3. Update the data structure: FFTDATA = power_fftscope(FFTDATA)
For an example using a signal with a known spectrum, see the attached files:
fft_analysis_export_example_2018b.m
fft_analysis_export_example_2018b.slx
