RE: [CAD_CAM_EDM_DRO] Re: Stepper Motor and Cable Shielding. Any tips?

Hi,

Logic analysers are designed for digital circuitry, oscilloscopes for
analogue circuitry. To check out the stepper drive circuitry, both devices
are useful. The oscilloscope can be used to "see" noise in the power supply,
such as ripple, voltage spikes etc. Affordable oscilloscopes usually have 2
channels (they can display 2 separate waveforms at once) and have no storage
capability.

The logic analyser can only present the data as either Hi (5V) or Lo (0v).
The advantage of the logic analyser is that it can capture 8, 16 or more
channels at once, and captures a number of samples, i.e.; 1024 or more.

A logic probe shows the state of a single line, Hi, Lo, open, or clocking.
You cannot "See" the signal, determine the frequency if it is changing or
measure it in the time domain (frequency).

With the data from the logic analyser, I can measure the period between the
step pulses and determine it is constant and not jittering.

I hope this helps.


Peter Homann
<mailto:peter.homann@...>
Work : +61 3 8530-7755
Adacel Technologies Ltd Fax : +61 3 9596-2960
250 Bay St, Brighton 3186, VIC, AUSTRALIA Mobile : 0421 601665
http://www.adacel.com.au Australian Software Engineering Excellence

> -----Original Message-----
> From: eforum3001 [mailto:eforum@...]
> Sent: Thursday, 25 July 2002 11:23 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Stepper Motor and Cable Shielding. Any
> tips?
>
>
> Jon Elson <elson@p...> wrote:
>
> > A logic analyzer is something like a digital storage oscilloscope,
> except
> > that it only has 1 and zero readings for each input channel. the
> advantage
> > is that it usually has many channels, so it can examine a whole
> address
> > and data bus at one time. But, it still can be useful for looking
> at long
> > trains of pulses, especially if it has a long capture record.
> >
> > So, yes, it tells you a lot more than a logic probe, which is
> limited by
> > what your eye can capture.
>
> How much more useful is an oscilloscope cf with logic analyser? I
> suppose the analyser can't tell when the pulse train is not "clean"?
>
> Hoping to hear about the experience of those who had found the
> analyser/scope, eg:
>
> "When the x-axis started to lose steps, I connected the analyser to
> the pulse generator, and found that .......... etc. etc.
>
> Thanks in advance
>
> Peter
>
>
>
>
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