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The various models are just applicable to different needs, making the
machine more appropriate for the application scenario. Although based on
same hardware, performance may vary slightly due to a preference for driving
methods depending on the scenario.
3.1 Spectrometer
A spectrometer is an instrument that displays a signal in the frequency
domain, and the results displayed are called spectrograms. Usually, the
frequency is represented by horizontal and the amplitude by vertical, the
physical meaning being the amplitude of the signal at different frequencies.
3.1.1 Horizontal Axis
The unit of frequency is hertz (Hz), which indicates the number of
repetitions per second and used to be known as cycles per second (C/s). RF
signals tend to be larger in frequency, so larger megahertz (MHz) and
gigahertz (GHz) units are commonly used.
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