What is the Difference Between a VNA and a Spectrum Analyzer?
A vector network analyzer (VNA) is very different from a spectrum analyzer (SA). The former is used to measure the transmission and reflection characteristics of a Device Under Test (DUT), and the latter is suitable for measuring the amplitudes of frequencies applied to its input. Where an oscilloscope might display the time domain response of a number of input signals, an SA displays the Fourier transform of the signals, showing the distinct amplitude of each frequency component.The utility of the spectrum analyzer is clear. It distinctly shows the amplitude of the two frequency components separately, where the frequency content of the oscilloscope measurement is difficult to interpret.
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