In this video, you will learn how to set up the FFT math function in the Siglent SDS1104x-e oscilloscope. FFT is the abbreviation of Fast Fourier transform in the digital domain. The FFT is a very useful feature that helps you to debug the signals. For example to analyze the harmonics or signal noises, to examine how pure is an output sine wave (of an inverter), or how good is an amplifier, in terms of the THD (total harmonics distortion)