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I have a basic Rigol spectrum analyzer that sweeps across a range of frequencies and displays the amplitude of the signal.
When we go to a testing lab, their expensive spectrum analyzer has a mode where you put in a fixed frequency and it measures the duty cycles of your signal in the time domain.
What is that time-domain / duty cycle reading called for spectrum analyzers?
Since the input frequency is fixed you can set the spectrum analyzer to this frequency and then change the X-axis to display amplitude over time instead of over frequency.
This mode is called zero span mode. Here's an example:
The X-axis shows time from 0 (trigger point) to 10 ms
The Y-axis shows the signal amplitude
Note the "Span 0 Hz" in the bottom right corner Here the signal(s) are present at 3 MHz in a 3 MHz (-3 dB) resolution bandwidth.
So signals between 1.5 MHz and 4.5 MHz show with nearly the correct (less than 3 dB attenuation) amplitude.
