This is a filter removing low-frequency domain and passing only high-frequency domain with use of FFT algorithm, enabling pass of frequency domain above what you want. It is very useful in selecting high-frequency domain of signals and analyzing it.
Select data you want to apply this method in Analysis Window and click the icon of High Pass FFT-Filtering in Analysis Tool Bar. This will display a dialogue box for frequency setting as shown in the below. Input frequency values as you want and click Apply button. Then, you can get results from pass of domain above the specified frequency in Display Window, which are registered at Analysis Window. Results after high-frequency pass filtering appear to move fast as shown in the figure, so it is called as Fast Wave.