[sdiy] cute hand held scopes on eBay

[Steve Maietta]

Well thanks for the explanation.


ASM-1.. you don't say..  haha

~Steve
aka The ASM-1 Orphanage.  On my third. 



--- On Thu, 2/23/12, Neil Johnson <neil.johnson97 at ntlworld.com> wrote:

> From: Neil Johnson <neil.johnson97 at ntlworld.com>
> Subject: Re: [sdiy] cute hand held scopes on eBay
> To: synth-diy at dropmix.xs4all.nl
> Date: Thursday, February 23, 2012, 12:45 PM
> Steve Maietta wrote:
> > Thise "sine" waves look bad yes, but that's at
> 500Khz..  So for RF, okay its not going to work.. But
> perhaps for synth use they do a "good enogh" job?  For
> tuning circuits, trimming waveshapes etc??
> 
> The pictures on the webpage Rich linked to are quite
> astounding.
> Sure, it might show you a wiggly line, but I wouldn't trust
> it any
> further than that.  Definitely not for making any
> measurements.
> 
> Try observing the reset pulse from the comparator in a
> sawtooth VCO.
> Its typically a few microseconds.  Say, the ASM-1....
> should sit at
> the negative rail, then up to 0V for a few microseconds
> while the
> capacitor discharges, then back to V-.  You *might* see
> something with
> this toy.  You might not.  Or something that you
> can't say whether is
> correct or not.
> 
> Heck, even that 500Hz square wave on the review site --
> what's with
> the over/undershoot?  Is that in the circuit, the
> probe, or the scope?
> 
> > good S-DIY bench/pocket tool?
> 
> Not in my opinion.  A waste of money, unless you want
> it for some
> artistic purpose.
> Better save up and get a decent analogue scope and decent
> probes.  Or
> if you need to capture occasional events or need to dump out
> dataplots
> to a printer or a PC get a decent DSO.
> 
> This issue has been discussed on the list several times over
> the
> years.  Rigol and OWON seem quite popular.  Or be
> lucky on eBay or a
> reseller for a second-hand Tektronix or HP/Agilent.
> 
> Cheers,
> Neil
> -- 
> Modules and more: http://www.cesyg.com
> Homepage: http://www.njohnson.co.uk
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