Many of today’s digital oscillo- scopes include a Fast Fourier Transform (FFT) for frequency- domain analysis. This feature is especially valuable for oscillo- scope users who have limited or no access to a spectrum analyzer yet occasionally need frequency- domain analysis capability. An integrated oscilloscope FFT pro- vides a cost effective, space sav- ing alternative to a dedicated spectrum analyzer. Though the latter does exhibit better dynamic range and less distortion, the dig- ital oscilloscope offers several compelling benefits.