[sdiy] Pocket oscilloscope

[Pete Hartman]

The DSO Quad is digital, as the name implies.  Whether it aliases or
not depends on the ratio of the time base to the signal.  I've seen
some pretty funky stuff, in a couple cases leading me off into the
weeds chasing distortion that didn't actually exist.  Normally it's a
matter of just adjusting the time base though, so it' snot like a huge
problem.

Whether Rigol etc high quality digital scopes have the same issue I can't say.

Thanks

Pete

On Sat, Sep 13, 2014 at 7:45 AM, Andre Majorel <aym-htnys at teaser.fr> wrote:
> On 2014-09-13 12:25 +0100, gordonjcp at gjcp.net wrote:
>> On Sat, Sep 13, 2014 at 01:20:18PM +0200, Andre Majorel wrote:
>> > On 2014-09-13 07:42 +0100, gordonjcp at gjcp.net wrote:
>> >
>> > > My HP quad-trace 100MHz DSO sits with a thick layer of dust on
>> > > top and my Iwatsu 20MHz analogue is pretty much never switched
>> > > off, even working on RF stuff...
>> >
>> > I'm curious. In what ways is the HP worse than the Iwatsu ?
>>
>> Like all digital 'scopes it cannot display analogue signals.
>> Good luck making any sense of the aliased pixelly mess.
>
> Oh. I was led to believe that modern digital scopes didn't alias
> any more, or at least not so badly. Pure fantasy on my part ?
>
> --
> André Majorel http://www.teaser.fr/~amajorel/
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