A spectrum analyzer measures signal level as a function of frequency. A swept heterodyne instrument selects frequencies through mixing and filtering; an FFT-based instrument estimates spectral content from sampled time records. Resolution bandwidth, observation time and windowing affect whether close tones are distinguished and how noise appears. A tall spectral peak is not automatically the signal's total power: calibration and integration conventions matter. Compared with an oscilloscope's time trace, the spectrum exposes frequency components, harmonics and out-of-band emissions.
A spectrum analyzer is an electronic instrument used to measure the amplitude (strength) of an input signal against frequency within a specific frequency range. It visualizes the signal's spectral content, allowing users to see how much of the signal's power is present at each frequency. This makes it an essential tool in various fields, including telecommunications, broadcast engineering, audio engineering, and electronic design.
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