[vcf-midatlantic] Open Hardware DSO - 100 MHz/250 Msa/sec - haasoscope

J. Alexander Jacocks jjacocks at gmail.com
Sun Nov 19 19:35:16 EST 2017


I use a Tek TDS380, but I was more thinking of this scope as an interesting
open source project for someone who didn’t already have a scope, and who
enjoys hacking.

I do love to see open source hardware projects that serve a useful purpose.

- Alex

On Sun, Nov 19, 2017 at 17:17 David Gesswein via vcf-midatlantic <
vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:

> On Fri, Nov 17, 2017 at 11:24:03PM -0500, J. Alexander Jacocks via
> vcf-midatlantic wrote:
> > There's a newish project on Crowdsuppy that I thought the group might
> find
> > interesting:
> >
> > https://www.crowdsupply.com/andy-haas/haasoscope
> >
> > ...
> > What does anyone think?
> >
> It all depends on that you want to do with it. This is written assuming you
> are troublshooting old computers.
> You need sufficient bandwidth
> to view your signal of intrest and sufficient sample rate to make it look
> reasonable. Sampling twice the frequency of a sine wave captures the
> information but it doesn't look like one.  There are ways to help the
> display
> some with signal processing though I don't think it does that.
> Couple pages discussing
> http://www.ni.com/white-paper/4333/en/]
> https://www.tek.com/document/online/primer/xyzs-scopes/ch3/evaluating-oscilloscopes
> I think the sample rate will be the bigest limitation. You will need to
> see the characteristing of signals you will want to look at.
> For troubleshooting old equipment the degredation of the signal edges
> is normally not as big an issue. The faults are normally not that subtle
> but I have run across glitches on signals causing trouble that the low
> sample
> rate can hide.
> The +-5V and +- 500 mV is somewhat limiting but ok for looking at normal
> TTL signals. For checking ripple on power supplies or analog work may not
> be.
> Its onboard display option doesn't seem to have sufficient size or
> resolution to be useful so I think you will always need some sort of
> computer to use it.
> Being able to grow to more channels is interesting though four is useually
> enough. I have a 2 channel Rigol and four would be nice at times.
> I didn't see enough to evaluate how the software is. Like always poor
> software can make anything a pain to use. It says it supports
> various triggering without giving specifics.
> A reasonable update rate is needed for seeing intermittent problems. I
> would get the high speed readout. Its unclear how many waveforms per second
> that gives you.

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