Re: Two rotary encoder questions

> The Goldmine encoders are marked HEDS9100 with another marking of

A00.

You can find the exact specifications on the Agilent website. Search
for heds9100 and it will tell you how many counts per in it is
compatible with for A00.

>
> The HP HEDS datasheet "rates" encoders in CPR when used with

codewheels

> that have an optical diameter of 22 mm.

The critical spacing on optical encoders is the distance between the
lines on the code wheel. To figure this, divide the number of lines
in the encoder (1000 in this case) by the optical circumference (Pi *
22mm in this case) to get the number of lines per inch. A rotary
encoder with x lines per in" code wheels should be compatible with
the linear with the same number of lines per inch.

> The Inkjet codewheel is a bit different, though. Its optical

diameter is

> very nearly 1.6 times the reference diameter of 22 mm. Am I

correct in

> thinking that the encoders themselves are 300 CPR encoders ?
>
> And can 300 CPR ROTARY encoders be used with 300 LPI LINEAR strips ?

Unless the circumference of the 300CPR encoder was 1", I'd say no
(and this is unlikely since a wheel with this spec would only be .3"
diameter).

IIRC the 300LPI linear strips are at the minimum line width for the
mylar disks and encoders. The finest pitch rotary would therefore
probably work with the linear strips.

Hope that helps.

-Erik Reikes