Re: gEDA-user: Any DIY USB Scope project on schedule? Or some recommmendation?

[Ales Hvezda <ahvezda@xxxxxxxxxxxxxx>]

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-- Cut here --
Delivery-Date: Tue, 23 Nov 2004 16:15:26 -0500
From: berni.joss@xxxxxxxxxxxxxxxxxxxxxxxxxx

On Tue, Nov 23, 2004 at 08:19:48PM +0100, Christian Frisson wrote:
> When it comes to consumer products, specifications are used to being awkward in
> order to sell more. I suppose they muddled up frequencies and samples on
> purpose. Let alone repetive signals, the unit can acquire 1M of samples per
> second for BOTH channels. Then divided by two, it can be considered as a
> sampling frequency per channel (don't ask me about buffer sizes and so on to
> write the right formula, it should match, or I'm totally wrong and please
> correct me, I'm just figuring out a kind of plausible explanation ,-) and be
> again divided by two to get the upper frequency of the measurement range: then
> we get those 250 kHz!

I'm not familiar with this product, but I'd expect the 250kHz to be the
analog bandwidth [you know amplifiers etc. :-)] which is in principle
unrelated and independent of ADC sampling rate [even though in a good
design you try to match them]

Berni