Jan Derogee wrote:

> We finally came to the conclusion that the loss of encoder-pulses is
> caused by an extremely rear fenomena called EMC.  It occurs only when
> we switch on the lights (TL) and this combination of switching on and
> of the lights durings tests is extremely rare.  But we know the cause
> now searching for a better filter to solve the problem of EMC.

  You mean the fluorescent "strobe" lamp was shining into your optical
encoder?
--
  Cheers,
        Paul B.