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

Except that step pulses are usually very narrow and not a square wave.
The frequency components of a narrow step pulse are much higher (in
freq) than the base frequency you are identifying.

On my system, the step pulses are only a few microseconds wide. You
will certainly be able to see a stream of pulses with a 20KHz scope, but
you won't be able to trigger on and resolve a single pulse. Having said
that - for trouble shooting, a 20KHz bandwidth may be ok, but on that
basis, I would recommend a trusty old logic probe instead.

In any event, try winscope if it has a trial/evaluation period you will
learn from the experience.

Cheers, Peter

j.guenther wrote:

> 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@...]
>>Sent: Friday, May 10, 2002 10:10 AM
>>To: CAD_CAM_EDM_DRO@yahoogroups.com
>>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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>
> 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.
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> 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.
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