Re: [CAD_CAM_EDM_DRO] Re: First note-Help

JanRwl@... wrote:

> In a message dated 29-Jun-01 16:06:53 Central Daylight Time,
> mariss92705@... writes:
>
> > The cure was to place a .1 uF multilayer ceramic capacitor across the
> > encoder's +5VDC and GND lines, at the encoder itself. Problem
> > disappeared entirely!
> >
>
> It always blows me away when a MANUFACTURING FIRM doing "high-tech" will omit
> some TINY inexpensive parts so OBVIOUSLY needed for such! Mariss, or anyone:
> Can you comment instructively on this point???

Yes, its distressing. But, you have to look at the applications this
type of sensor was really designed for. It was designed as a shaft
encoder for instrument panels, where the microcontroller was probably
only 2 - 5 inches away, in a relatively noise-free environment,
or in small mechanical devices like tape cartridge libraries, etc.
where things are a little noisier, but still nothing like a machine tool
control where the encoder counter (and power source) is on the other
end of 20+ feet of cable from the encoder. So, it is not too surprising
that this particular encoder read head is not optimized for this
application. If you buy $250 - 500 industrial grade linear or
shaft encoders, you will see that this problem is usually (but not
always) taken care of.

Jon