Date   : Tue, 26 Jan 2010 09:58:21 +0000
From   : steven.bass@... (Steven John BASS)
Subject: OT: Oscilloscope

Rick Murray <rick@...> wrote:

> On 25/01/2010 00:05, Darren Grant wrote:
> 
> > I have a Velleman digital scope that connects to Parallel port on
>  > a PC but it stays in the box unused.
> [...]
> > bode plot (plotting input against output through a range of frequencies)
> > really useful for measuring how linear a circuit is
>  > over a range of frequencies.
> 
> But, yet, it stays in the box unused... :-)
> 
> 
> I'd like to get my hands on a little 'scope to, something like that 10MHz
> Unilab one (from the '80s). Sure, bigger better models offer more - and I
> could justify a reason for most features of a 120MHz triple-trace storage
> 'scope..... but there's a big difference between justifying and actually
> needing. Especially when you look at the price tag.
> 
> Here's an idea of what I mean:
>  
>
http://www.philipharris.co.uk/webapp/wcs/stores/servlet/ProductDisplay?&catalogId=10501&productId=107874
> [wow, it's been updated in the last 20 years, it's now 25MHz!]
> 
> On the other hand, for a third of the cost:
>    http://cgi.ebay.co.uk/_W0QQitemZ120521815192QQ
> And it can log data to an SD card. Shame it isn't a proper USB interface
> (it appears to be just an SD card reader), but it gives me an idea of how
> the world has moved on...
> 
> 
> If anybody has any suggestions for the cheaper (perhaps slightly less
> accurate) end of the market, let me know. You could argue that less
> accurate is useless, but I would counter-argue that there's only so much
> you can do with a multimeter!
> 
> 
> The main obstacle, though, is price vs how much it would actually be
> used...
> 
> 
> Best wishes,
> 
> Rick.
> 
Rick and Mark

Try this, which is a Vellman Instruments Personal 'Scope.

http://www.maplin.co.uk/Module.aspx?ModuleNo=32611




-- 
Steve