As far as I know, these fast CRO's, (if you can call that anymore),
sample a repetitive wave form over and over and build up a picture of
it by shifting the trigger point slightly on each scan. So in actual fact they
 are
not sampling the wave form at GHz rates, maybe down to KHz rates.

I haven't kept up with the latest gear though, so I may be out of
date here.


Tony.


Just when I thought I knew it all,
I learned that I didn't.