"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."

The 'old' analog scopes had this feature - and it truly
was a "delayed sweep" since there exists no memory
from which to pull data from and allow an 'expansion'
of  an area of interest. Instead, the earlier scopes
employed an actual 'delayed sweep' of the beam
across the CRT.

With today's modern scope, this appears to be a
historic term held over - probably 'cause all the
folks in industry are familiar with the concept.

Jim


----- Original Message -----
From: "John Hansen" <hansen@FREDONIA.EDU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, August 29, 2001 8:54 PM
Subject: Re: [EE]: Scope Recommendation


> I do not  work for Agilent, but I'm a faculty member at the State Univ of
> New York.  I recently managed to talk my univ into buying one of the
scopes
> described below for me.  I love it.  The one I got was the 100 MHz mixed
> signal unit.  It does have a pretty impressive memory depth and you can
pan
> and zoom the trace when it is captured.  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.  It also has a
> serial port that allows you to transmit the scope image directly into a
> word or excel document.  I expect to be able to use this to make
> transparencies of images to show in class.  This feature comes
> standard.  It also has a floppy drive for saving configuration
information,
> etc.
>
> The triggering features on it are pretty amazing.  For example, in
> analyzing an I2C signal, you can actually have it trigger on a specific
> data value.
>
> All of this may be common on other scopes for all I know.... I've never
had
> a really good one before.  But coming from a world where all I had was a
> junky analog scope, I was pretty amazed at what was available.  Not bad at
> $2500.
>
> The one reservation I have is that it is a monochrome screen.  It would be
> nicer (though undoubted more expensive) in color.
>
> John Hansen
> Professor of Computer Science and Information Technology
> State University of New York College at Fredonia
>
>
>

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