Discussion
Why is a spectrum analyser's resolution bandwidth setting important?
Answer: D
Narrowing the resolution bandwidth reveals finer spectral detail and lowers the displayed noise floor, at the cost of a much longer sweep, which is the central trade in every measurement. Maximum input power is set by the attenuator and the mixer. Frequency accuracy comes from the reference oscillator. Input impedance is fixed by the hardware, usually at fifty ohms. Reporting a noise measurement without stating the resolution bandwidth makes it meaningless, which is why it always appears alongside.
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