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Has any one measured the -3 dB point for a SDS2104X HD w 100 to 200 MHz Update?

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mawyatt:

--- Quote from: gf on February 25, 2024, 10:53:41 pm ---
--- Quote from: mawyatt on February 25, 2024, 04:48:25 pm ---You normally don't see folks using swept frequency measurements to determine scope pulse response!!

--- End quote ---

The problem, of course, is that you would need both magnitude and phase response to do that.
[ I would not rely on it being a minimum phase response in general. ]

--- End quote ---

Exactly!!!

Don't think the scope would use Maximally Flat Phase (Bessel) for Anti-Aliasing filter as the amplitude response is weak. More likely some composite type where pulse display artifacts due to amplitude and phase distortion are minimized. Don't know what that filter is tho, maybe someone (hint Performa01) in the know wrt scope front end Anti-Aliasing filters can comment??

Recall way back when we were working with a system that theoretically would show artifacts equally wrt amplitude and phase effects we designed an in-between filter which should equalize the errors from amplitude and phase effects. After initial testing the system we found the simple Butterworth was slightly better, so this was what the system went forward with and into production.

Best, 

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