[Robotgroup] scope, was car audio stuff

[Michael Boswell]

About 3 weeks ago I bought a Stringray from USB instruments. It was a little hassle getting the drivers loaded but it works great now for what I am working on.  $220 from EasySync-ltd.com
 12Bit A/D as opposed to 8bit on many others. Also dual channel.  It also comes with a Data logger application for very slow signals. 
As I said, I have only had it for a few weeks but it has done what I needed every time. . . . . So Far.

Michael Boswell
Austin End Of the Line Kite Team - Kite #4
http://Austineol.com
Picture Gallery at http://www.pbase.com/mboswell

-----Original Message-----
From: robotgroup-bounces at puremagic.com [mailto:robotgroup-bounces at puremagic.com] On Behalf Of Edwin Wise
Sent: Tuesday, March 25, 2008 5:23 PM
To: The Robot Group Mailing List
Subject: Re: [Robotgroup] scope, was car audio stuff


On 25 Mar 2008, at 3:22 PM, Andre Lamothe wrote:

> I think we are talking about apples and oranges. I am talking about  
> the
> cheap little USB digital scopes...

Yeah, I looked at those, but the price was too high.  When I can buy a  
two-channel Tek for the price!

And, in fact, the digital Tek only stores the discrete points, but it  
may do a min/max in analog time between it, giving the best of both  
worlds.  I'm not sure if it's just sampling at its highest rate, or  
has an analog sample/hold in the front-end to do the work, but from  
the doco:

Peak Detect. In this acquisition mode, the oscilloscope ?nds the  
highest
and lowest values of the input signal over each sample interval and uses
these values to display the waveform. In this way, the oscilloscope can
acquire and display narrow pulses, which may have otherwise been
missed in Sample mode. Noise will appear to be higher in this mode.

So, neat stuff.  For the analog version, it has to make enough of an  
imprint on the phosphor to see it still, and with my aging eyes, the  
support I get from the digital scope helps.

Edwin!
---
Edwin Wise, Rogue Technologist
Simulated Reality Systems, LLC
www.simreal.com



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