Re: Encoders

TADGUNINC@... wrote:

> From: TADGUNINC@...
>
> Another quick question,
> I have several older commercial printers, is there any way to determine
> the number of slots, cpr? I have a scope and a means of powering them up.

If these encoders have an index pulse, you hook a counter with a ratio counting
function to the index and one of the quadrature channels, and rotate it smoothly.
It doesn't have to be constant speed. It will show the cycles / rev.
With a scope, use the index channel, or rig up a homemade one that gives
one pulse per rev. Attach a motor, and spin at constant speed. use the scope
to time the index period, then time the period of a quadrature channel.
Divide index period by quad period, that should be the cycles/rev.
4 times that would be the quadrature counts / rev.

Jon