Hi all,

Thanks for the scope recommendations, I'll check them out.

I am curious about something, though. I have an old analog scope myself
(Tek 7704A) and it has the ability to "zoom" in on a portion of the
trace. However, I didn't think that was called "delayed sweep". What does
delaying have to do with zooming in? It seems to me as though it just has
to change the sweep rate during a part of the sweep in order to cause the
zoom.

Sean


On Wed, 29 Aug 2001, Barry Gershenfeld wrote:

> >It also has the ability to display
> >both the entire trace and a zoomed view of the trace on the screen at the
> >same time, so it's really clear which section you are zooming on.  Why they
> >misnamed this "delayed sweep" though, I can't figure out.
>
> >I've never had a really good one before.
>
> There you go.  The "really good" analog scopes have a feature
> where you can wait through part of the triggered waveform and
> then fire off the second trace running at a faster sweep
> to "expand" the view of a piece of the upper trace.  While
> the second trace is running it highlights that portion of
> the upper trace.
>
> Thus the name "delayed sweep".  Now being done digitally
> and all that, and called "zoom".  But you wouldn't know
> unless you'd seen one before.
>
> Barry
>
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