Re: [CAD_CAM_EDM_DRO] Re: Litton shaft encoder - info?

>I tried 5 volts to supply the encoder. I found 250 PPR from both of
>the two output wires.
>
>There ia only one track on the optically reproduced disc. (there is
>also a track with one index mark but this does not appear to be read).
>There are 4 leds, (infra-red so not visible). Presumably each pair
>includes a light source, and a led to read the disk track. There is a
>house numbered 14 pin chip on the encoder PCB.
>
>Is it possible to get quadrature output from one encoder track only?

Yes, because the two emitter/detector pairs are offset by "90 degrees" (1/4
the width of one optical stripe). One stripe blocks one pair first, then a
little distance it blocks both pairs, turns a little more and only blocks the
2nd pair, and finally after turnning a little more, it dosn't block either pair.
The cycle then repeats with the next stripe.

- Steven Ciciora