EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: Sailor on May 19, 2014, 10:54:54 pm
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May not be any problem at all, but I don't recall seeing any channel-channel phase measurements at the top end of 'bandwidth extended' scopes (Rigol, Agilent, etc). One would expect that all/whatever inbuilt filtering there is in these scopes is fairly soft and that the underlying full-bandwidth performance is good, but I think it should be looked at. Of course, if someone already has, then ignore this post entirely.
Just a thought.
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May not be any problem at all, but I don't recall seeing any channel-channel phase measurements at the top end of 'bandwidth extended' scopes (Rigol, Agilent, etc). One would expect that all/whatever inbuilt filtering there is in these scopes is fairly soft and that the underlying full-bandwidth performance is good, but I think it should be looked at. Of course, if someone already has, then ignore this post entirely.
Just a thought.
What do you consider top end "bandwidth extended" scopes? I assume that you aren't referring to the real performance top end (30GHz +) since you included Rigol in the group...
As far as channel to channel phase - are you simply referring to the timing skew between channels? Most of the better scopes give you the ability to adjust channel to channel skew, mainly to account for unequal cable/probe delays, etc.
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Sorry, I wasn't clear. By top-end I meant the upper limit of the scope that has been 'extended'. i.e. if a 70MHz unit has been re-jigged to now deliver a -3dB point of 120MHz, what is the ch-ch phase difference around the 120MHz area. Ideally it would still be ~zero, but with filters involved, you never know until you measure them.
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70MHz unit has been re-jigged to now deliver a -3dB point of 120MHz, what is the ch-ch phase difference around the 120MHz area. Ideally it would still be ~zero, but with filters involved, you never know until you measure them.
and the birth of a group we shall call "Phase-Nuts".... I took a 200 to a 300Mhz.. let the analysis begin!
JLM