A Spectrum Analyzer is a type of electronic test equipment used to measure the frequency spectrum of a signal. It can display the strength or power of a signal at various frequencies and is often used to identify and troubleshoot issues with radio communications systems, as well as in the field of audio and acoustics.

There are different types of spectrum analyzers, including analogue, digital, and real-time, which vary in terms of the level of detail and precision they can provide.