Re: [CAD_CAM_EDM_DRO] Re: Re: emc help

Ray Henry wrote:

>My last wonder is why would a company like STG build a card and report
>that it will read 10MHz if they knew that there were no pulse coders out
>there that could come even close to that speed?
>

Because it comes STRAIGHT off the data sheed for the LS7166 encoder counter
chip they use. It can do 10 MHz because it has NO FILTERING whatsoever
on the quadrature inputs. At 10 MHz, the encoder signals better be REALLY
free of any noise, or there will be an accumulation of missed counts.
That's
why the LS7266 chip added a digital filter on the quadrature inputs.

Jon