Agilent spectrum analyzer meas...

FFT and Sweep spectrum anaAgilent Performance Spectrum Analyzer Series Swept and FFT Analysis Application Note

Spectrum analysis measurements often involve trade-offs between accuracy, speed and dynamic range. In most cases, emphasis on one of these parameters adversely impacts the other two. For example, the wide resolution bandwidths (RBW) used to achieve fast measurement speeds result in higher noise levels and potentially reduce dynamic range. Increasing the sweep rate improves measurement speeds for a given RBW but reduces accuracy due to inadequate settling time for the intermediate frequency (IF) filters. Alternatively, dynamic range may be emphasized at the expense of measurement speed because of the need to use narrow (slow sweeping) RBW filters and, in some cases, averaging.

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