What does RBW stand for
Resolution bandwidth. This video [1:50/5:14] uses an example of a 300
Hz RBW to resolved
equal amplitude signals separated by 1 kHz:
and is it the same as IF BW ?
Nope. Traditional analyzers with non-baseband IF scan wider bands
mixed down to some intermediate frequency,
so IF BW must be wide enough to pass all signals to be subsequently resolved.
Oristo