Litton shaft encoder

Thanks Steven.

Next question: Is the assigment of "A" or "B" channel arbitrary so I
can use either wire as "A"? If not how to ID "A".

Grant

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Steven Ciciora"
<sciciora@A...> wrote:

> >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