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Date:	Tue, 4 Sep 2018 17:02:52 +0000
From:	"Peter Stuge (peter AT stuge DOT se) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject:	Re: [geda-user] Equipment
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karl AT aspodata DOT se wrote:
> I already have a 200HMz analogue one, but I'd like to be able do
> single-shot captures.

Ack.


> > > My guess is that for normal analogue and i2c,rs232,spi things I'd
> > > be happy with a four channel 200MHz one with suitable triggers.
> > 
> > I'd suggest a hardware supported by https://sigrok.org/ for digital
> > protocols,
> 
> Ok, but it seems none of the higher end scopes are supported.

Sorry, I wasn't clear. The instrument for digital analysis shouldn't
neccessarily be the scope. I wanted to suggest that you consider a
separate instrument or rather acquisition hardware for digital
signals, and choose based on what sigrok supports.

sigrok does have support for analog instruments, and it's a nice
toolchain for sure, but I would consider it more critical for digital
signals.

That said, sigrok supports several standardized interfaces, one of
which will certainly be available at least as an upgrade for almost
any scope.


> > but having a scope which also has digital inputs is quite
> > nice, but usually comes with a relatively hefty pricetag.
> ...
> 
>  This set has it:
> https://se.farnell.com/rohde-schwarz/r-s-hmo3054-hoo10-hoo12-hoo14-ho3516/oscilloscope-kit-hmo-complete/dp/2448547
> and the price is ok.

That budget should allow good choice. Check if Dave Jones (EEVblog) has
mentioned the HMO3000 series. He's torn down the lower end 1200 series.

Note that the logic probes for HMO3000 apparently only go up to 350 MHz,
I guess regardless of which analog sample rate you've paid for. I don't
think that's very good value for money, and 16 logic channels is also
not fantastic.

I guess the R&S/Hameg scope is a good scope, but it confirms what I
tried to say before; a good scope with logic inputs will either be
real expensive or not really have performance comparable to a pure
logic analyzer for same money.


> Yes, according to
>  http://www.analog.com/media/en/analog-dialogue/volume-51/number-4/articles/volume51-number4.pdf
> page 12, you need a 1 to 6GHz scope for transient analysis.

Ok - thanks for the link!


> you don't need to do everything.

Very true.


//Peter

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