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Phase settling in transient mode - E5052B

Question asked by robadi on Jun 12, 2013

I'm using the E5052B in transient mode to measure frequency and phase settling. I am doing a frequency jump of 50 MHz (from 5.40 GHz to 5.35 GHz) and monitoring the settling of the VCO output.

I have an issue where, if the 'Narrow span' is set to 200 us, the output looks as expected; but if 'Narrow span' is set to 100 us, the output looks incorrect. I don't know if I can trust the expected plot.

See attached files to see what I mean (I am just looking at the two plots on the right). I have also attached the E5052B state file.

Can you explain why the two plots look different? Or do you need more information.

Also, is it possible to widen the two plots on the right across the whole screen, so there are two plots on the screen, not four.