[HH] portable oscilloscope

[Drew Van Zandt]

Usable bandwidth for a decent (nondistorted) signal maybe 2-3 MHz.  The
connector, while better than the audio connectors used on the 1-channel
ones, isn't great.  You can get it to work well for a higher frequency at
the expense of distortion at lower frequencies, though.  There's a trimmer
pot (or cap, didn't look closely).  That's not the greatest solution.

The 50MHz Rigol can, I hear, be made into a 100 MHz with a firmware hack.
 We have two at the Asylum, and aside from the UI being a little odd,
they're decent scopes.  I'd still rather have a Tek or LeCroy, but I don't
prefer them by as many dollars as you have to sacrifice to summon the Elder
Scope Gods.

No experience with the Atten.

*
Drew Van Zandt
Artisan's Asylum Craft Lead, Electronics & Robotics
Cam # US2010035593 (M:Liam Hopkins R: Bastian Rotgeld)
Domain Coordinator, MA-003-D.  Masquerade aVST
*



On Tue, May 1, 2012 at 4:39 PM, Tom Metro <tmetro+hhacking at gmail.com> wrote:

> Drew Van Zandt wrote:
> > * Not actually 4 channels.  2 O-scope channels, 2 digital inputs.
>
> Right, I noted that.
>
>
> > * Distortion is terrible.  72 MS/s is an egregious enough exaggeration
> > of something that is technically true that I would be tempted to punch
> > their marketing guy in the snoot.
>
> Good to know.
>
> What is the source of the problem? Cheap ADC?
>
> A well built DSO should be able to capture consistently repetitive
> signals that exceed 1/2 its sampling rate. Though in most cases the
> whole reason why you are using a scope is to spot anomalies in the
> signal, and for that you need your DSO's Nyquist to well exceed your
> signal frequency.
>
> What, in your opinion, is the usable bandwidth of this scope?
>
>
> > * Better than nothing.  Marginally.
>
> I'm sure given time they will get better, but it sounds like they aren't
> there yet.
>
> For now, it might be better to spend a bit more for something like:
>
> http://www.amazon.com/Rigol-DS1102E-Oscilloscope-Channels-Sampling/dp/B001VKCJ0M/
>
> or
>
>
> http://www.amazon.com/Atten-ADS1102CA-Oscilloscope-Channels-Sampling/dp/B0055B4JKG/
>
> Both of which are sub-$500 (if you shop around) 1 GS (100 MHz BW) DSOs.
> They appear relatively compact and portable, but they're not handheld.
>
>
> > * Asylum has one, as well as a pile of the single-channel version.
>
> How about a Rigol or Atten?
>
>  -Tom
>
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