The 89600 VSA software does not have a VBW control. Video bandwidth filtering applies a filter that smooths the signal in the frequency domain. The closest available feature in the VSA is RMS averaging which will reduce variations by averaging each individual frequency bins using data from multiple measurements.

Hi tabbott.I'm confused about averaging in spectrum analyzer that uses FFT method.Trace averaging is used to emulate video bandwidth but what's the mathematical relationship between average count and VBW?Is there a function or something?Thanks.

The 89600 VSA software does not have a VBW control. Video bandwidth filtering applies a filter that smooths the signal in the frequency domain. The closest available feature in the VSA is RMS averaging which will reduce variations by averaging each individual frequency bins using data from multiple measurements.

I hope this was helpful.