Re: Converting Heidenhain Scale to sq wave

Brian,

I assume you mean "reference current" instead of "reference pulse".

If so, and assuming they are a current source, then load the
reference 8uA and the 0-16uA outputs with 10K resistors to ground.
Connect two comparators (LM393), one going to REF and channel A, the
other to REF and channel B. Apply a little hysterisis to each and you
should be in business. The outputs will be TTL and in quadrature if
you pull them up to +5VDC using 1K resistors.

Mariss

--- In CAD_CAM_EDM_DRO@y..., "bdrmachine" <bdrmachine@h...> wrote:
> I have a Heidenhain LS 603 glass scale that has a sinewave output.
> The manual states that the pickups are silicon solar cells in push-
> pull arrangement, 16 microamp peak to peak (pp). The reference
> pulse is 8 microamp (pp).
>
> Question: Has anyone converted this signal to 5 volt TTL levels?
> If so please share the circuit diagram with me. If not (after I
> reinvent the wheel) I will follow up with a future post and let you
> all know what I found out.
>
> Thanks
> Brian