FFT

The FFT graph contains a Fast Fourier Transform (FFT) analysis of the selected data. The FFT gives the amplitudes of the frequency components of a data series and displays a bar graph showing the amplitudes of the frequencies shown along the X-axis. It can be used to find the frequencies and amplitudes of the sine wave components that make up a non-sinusoidal signal.

Changing the columns displayed: Double-click on the FFT graph. An axis options window appears from which you can select columns for display. You can also change the columns by selecting the Additional Graph Options -> FFT Graph Options from the Options menu.