I know what a VNA does, but what does an FRA do that's different? From what I can find, an FRA seems to be primarily used in electrochemistry and other physical sciences, where what is being tested isn't an electrical component.
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A short anwer could be: A VNA measures scattering parameters (which are dimensionless ratios of wave amplitudes) of a frequency swept input signal versus a FRA measures amplitude and phase change of a frequency swept input signal.
Both are mainly used in measuring electrical components or circuits.
answered Apr 15, 2023 at 19:46