Re: quadrature endcoder woes?

Are you using a servodrive to turn your motor at 1 RPM? If you are,
your 'scope is probably picking up switching noise from the drive.
That switching noise is phantom in the sense it's not really there.

Try grounding the motor back to the drive supply ground input or turn
the motor slowly by hand with the motor disconnected from the drive.
I think you will see a much prettier picture then.

Mariss

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
>
> Aaron wrote:
>
> >I just installed a US Digital encoder (E4P-300-250-T) on a motor.
It
> >was a royal pain as the centering tool was pretty tight on the
motor
> >shaft and then the centering tool was quite tight on the PCB when
I
> >pressed it into place.
> >
> >With my motor running at a constant 1 rpm, I get the following
scope trace:
> >http://www.bright.net/~agarb/quad.jpg
> >
> >
> Your scope is set for 1/10th of a second per division. Set it for
a much
> faster sweep rate, and you will likely see a more reasonable trace.
>
> Jon
>