There are a variety of uses that can benefit from viewing the frequency spectrum of a signal. Using the FFT math function on a time domain signal provides the user with frequency domain information and can provide the user a different view of the signal quality, resulting in improved measurement productivity when troubleshooting a device-under-test. Examples include: Analyze harmonics in power lines Measure harmonic content and distortion in systems Characterize noise in DC power supplies Test impulse response of filters and systems Analyze vibration More information and examples can be found in the application note titled FFT Applications for TDS Oscilloscopes . */