Date: Fri Aug 15 14:33:59 2008

Author: Zani, Gerald

Subject: Re: oscilloscope with video output

Post:

Mike,

Wow.

Thanks.

A Very interesting product!

I would want to try it out and to check if aliasing is a problem? Best,
-- JZ


-----Original Message-----
From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Michael A. McFarland
Sent: Friday, August 15, 2008 2:28 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] oscilloscope with video output

Hi Jerry and everyone else,

We have used PicoTechnology's PicoScopes, distributed in the U.S. by
Saelig,
for about two years. These scopes deserve more attention than they get.

When you look at a dual-channel PicoScope unit, you see a little blue
box,
very approximately the size of two DMMs, with three BNC connectors on
the
front and one USB port on the back. Each dual-channel unit takes in
signals
to be displayed via two of the BNCs, and takes an external triggering
signal
through the third BNC. (Either of the two channels can trigger the
display,
as can the signal through the third BNC.) As the tv Gecko might say,
"Tha's
it! Isn't it a lot like your garden-variety oscilloscope? The
controls,
instead
of being on the front of an scope-type unit, are just, lemme think,
programmed into the programming, tha's all."

To overcome the slow speed of its USB connection to a pc or to a Mac
running Windows, each unit stores info temporarily in a buffer. The
computer
takes in the contents of the buffer as fast as the USB allows. The
buffers
speed up processing of signal info.

So, now, instead of seeing the signal on the little rectangular screen
on an
oscilloscope, you see the signal displayed on a screen as large as the
com-
puter's. Instead of trying to project a signal from a classic
oscilloscope onto
a projection screen, you put what you see on the COMPUTER's screen onto
a
projection screen - a thing that professors do whenever they use
PowerPoint
or show their classes a web page. Instead of using an expensive digital
scope
to produce a signal image you can keep, you save your computer screen's
display as you would any other computer file. Instead of using an
expensive
digital scope to get on-screen digital readouts of time or of amplitude,
this
relatively inexpensive PicoScope provides horizontal and vertical lines
and
readouts of their times or voltages with a slight motion of the hand.
In fact,
the readouts occasionally appear with TOO slight a motion of the hand.
If you
buy one of these units, you can see all this, including whatever
drawbacks,
for yourself.

Incidentally, we use the "Filtered Current" option a lot.

These PicoScopes deserve more attention than they get. I do not have
any
financial interest in PicoTechnologies or in Saelig, but probably none
of you
very fine Tapplers thought I did.

Viva Tapplers!
Mike

Quoting Paul Nord :

> Jerry,
>
> Most projectors have a VGA input. That seems like the way to go.
>
> Standard video resolution is really rather poor. If there's not a
> model on the market right now which does composite video, there is
> never going to be one. It's a dead-end technology. The era has
passed.
>
> Paul
>
>
> On Aug 15, 2008, at 10:50 AM, Jerry DiMarco wrote:
>
> > I've been using the video camera to project the scope screen and
> > have considered buying a converter, but would ultimately like to
> > find a scope with the right output so setup would be quicker. I'm
> > surprised that the major mfrs don't make models with this feature...
> >
> >
> Jerry
> >
> >
> > At 8/14/2008 07:33 PM, you wrote:
> >> JD,
> >>
> >> I think you can get a VGA to composite video converter or a PC to
TV
> >> converter for about $50? -- JZ
> >>
> >> -----Original Message-----
> >> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-
> >> owner@lists.ncsu.edu] On
> >> Behalf Of Jerry DiMarco
> >> Sent: Thursday, August 14, 2008 5:43 PM
> >> To: tap-l@lists.ncsu.edu
> >> Subject: [tap-l] oscilloscope with video output
> >>
> >> Tappers,
> >>
> >> Has anyone found an oscilloscope that can be used for demos,
> >> that has
> >> RCA or BNC video output connectors? Not interested in VGA type
> >> outputs,
> >> would like to be able to plug it in to a document camera for
> >> instant display. Thanks...
> >>
> >>
> >> Jerry
> >>
> >> <><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
> >>
> >> Jerry DiMarco
> >> Manager of Lecture Demonstrations and Instructional Labs
> >> Montana State Univ., Physics Dept.
> >>
> >> Bozeman, MT
> >>
> >> Our Motto: "Find your inner demo."
> >
>
>


--
Mike McFarland
Physics
University of Notre Dame




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