A spectrum analyzer measures the power of spectrums of known and unknown signals. Spectrum analyzers collect information such as the magnitude of an input signal compared to its frequency. As a frequency analyzer, spectrum analyzers’ main use is to document and analyze electrical input signals as well as spectral compositions of other signals. This tool’s spectral analysis involves signals such as optical light waves and acoustic pressure waves.
Using a spectrum analyzer enables you to analyze spectral components of a signal you cannot observe easily in time domain waveforms. These include dominant frequency, harmonics, bandwidth, power, and distortion. Spectrum analyzers are useful in characterizing electronic devices such as wireless transmitters.