On Monday, April 16, 2012 07:05:21 AM andy pugh did opine:

> 2012/4/16 gene heskett <ghesk...@wdtv.com>:
> >> http://img35.imageshack.us/img35/3557/screenshot1kq.png(pins 12 and
> >> 13 supposed to be A and B)
> 
> I think you might need to move the encoder more slowly, as you only
> have a 1mS sample rate available.
> It almost looks like there is no actual quadrature offset in the
> channels.
> 
> I think counter-mode only counts up, and only looks at one channel.
> 
> > Looks like it is but those slow rise & fall times
> 
> That is a Halscope trace, so digital. The apparent slew-rate is just
> how Halscope joins the dots.

My halscope tracing looks similar to the real scope, shows none of that 
slew rate limited effect, only the expected sample timing jitter. When I 
can run the spindle again, I will do a screen capture and post it alongside 
the 100mhz version.

Cheers, Gene
-- 
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-Ed Howdershelt (Author)
My web page: <http://coyoteden.dyndns-free.com:85/gene>
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