> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of Russell McMahon
> Sent: 10 March 2010 03:04
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] USB scope probe - request for comments and ideas
> =

> Sounds fantastic.
> =

> 1. =A0For several probe based versions you could consider eg IR pulse
> for sync. Heath Robinsonish, but may be workable up to some limit.
> =

> 2. Bit it seems that it's trying to do one thing because of the
> gee-whizz factor that isn't strictly necessary, and that adversely
> affects the whole design - which is the "fit it all in the scope probe
> body". That's a great wow-factor objective, but what are the costs of
> doing that ($, facilities, flexibility / limitations), and what real
> advantages does it gain?
> =

> Adding a (boring, like everyone else has) intermediate box

I agree with most of Russells comments.  A single channel is very limiting =
IME, you very often want to see what one or more signals is doing in relati=
on to another.  I would happily have a small box with a couple of BNCs on i=
nstead of a "USB probe", though I fully understand this goes against your e=
ntire concept.

I've been looking for a useful USB scope for a while and the limitations I =
tend to see are:

1) Not enough channels.

2) Poor bandwidth, typicaly 1MHz or under and often not very flat.

3) Lack of triggering options.

4) Limited input voltage ranges.

5) Sometimes no AC coupling.

6) Rubbish host software (This could absorb a lot of work IMO).

I guess I want a BitScope, but at $600+ I'd be happy to sacrifice some perf=
ormance for some $$$.

Mike

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