Winscope ( was Suitable Cap for Gecko's was Re: 8-wire 1/2coil stepper?

--- In CAD_CAM_EDM_DRO@y..., "j.guenther" <j.guenther@v...> wrote:

I recently measured the current on my servos, I used 10 1ohms in
parallel to give 0.1ohm, this gives a voltage change of
0.1volts/amp. The rise and fall time of the pulses for the servos
was less than 10nanoSec, measured on a 100MHz scope. All you will
see with 20KHz bandwidth is possibly a blip to tell you that there
was a pulse there, but I don't think you'll get any useful
information. Also don't forget that you will need proper terminated
scope probes if your measurements are to mean anything.

Bernard


> It seems to me that a 20KHz scope should be just fine for looking
at step
> pulses, that is unless you are trying to drive your steppers at
6000 RPM or
> more. (20000 steps per second * 60 seconds )/200 steps per rev =
6000 RPM
>
> > -----Original Message-----
> > From: Peter [mailto:prenolds@s...]
> > Sent: Friday, May 10, 2002 10:10 AM
> > To: CAD_CAM_EDM_DRO@y...
> > Subject: Re: [CAD_CAM_EDM_DRO] Winscope ( was Suitable Cap for
Gecko's
> > was Re: 8-wire 1/2coil stepper?
> >
> >
> > Sorry to put a damper on this suggestion but the winscope is
bandwidth
> > (top frequency) limited to 20KHz. This would be ideal for
looking at
> > audio signals but with step pulses down in the 1-5 uSec range you
really
> > need a 20MHz scope (minumum)to see the transitions clearly.
> >
> > Look in the back of Poptronics magazine for used equipment
suppliers.
> > Or maybe search eBay? New 20-30Mhz scopes are around $300
> >
> > Cheers, Peter
> >
> >
> >
> > turbulatordude wrote:
> >
> > > for a really cheap scope, try winscope.
> > > it is a software scope that connects to your sound card
> > > port.
> > >
> > >
> > >
> > >
> > > --- In CAD_CAM_EDM_DRO@y..., "keongsan" <keongsan@y...> wrote:
> > >
> > >>--- In CAD_CAM_EDM_DRO@y..., "mariss92705" <mariss92705@y...>
wrote:
> > >>
> > >>
> > >>>All the neat action is on the current sense resistors, but you
> > >>>
> > > need
> > >
> > >>a
> > >>
> > >>>scope to see it. There, with a scope, you can easily see every
> > >>>microstep and most everything else on how well the drive is
> > >>>performing. It is the single most useful test point.
> > >>>
> > >>Anyone have used before or knows of a reasonably priced handheld
> > >>
> > > LCD
> > >
> > >>scope that is easy for beginners to use?
> > >>
> > >
> > >
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> > >
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>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com to
reach it if
> you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this as
a sister
> site to the CCED group, as many of the same members are there, for
OT
> subjects, that are not allowed on the CCED list.
>
>
>
> Post messages: CAD_CAM_EDM_DRO@y...
> Subscribe: CAD_CAM_EDM_DRO-subscribe@y...
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@y...
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> Moderator: jmelson@a... timg@k... [Moderator]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> bill,
> List Mom
> List Owner
>
>
>
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