Dave Fawthrop > wrote:

>Just reread your original post.
>
>As both an ex-engineer and a software writer, it still looks like a
>mechanical problem, and not a software problem. My guess is that the
>platform is dragging, catching or juddering on something.
>Mechanical problems sometimes build up slowly, or suddenly appear.
>Software problems are either there, or not there, all the time.

OK, I've just done this.

1. Place clean mirror on worktop to make a perfectly flat surface.

2. Make sure both sides of scale are clean, and place on mirror.

3. Zero scale.

4. Put cereal bowl on scale - 274g.

5. Add tablespoon (20g) of muesli - 294g.

6. Tip out muesli and put bowl back - 274g.

7. Add same muesli back very slowly over 1 minute - 276g.
i.e. it's somehow lost 18g.

8. Tip out muesli and put bowl back - 256g.
Still 18g down.

9. Remove bowl - and scale shows "----" (below zero).

This is quite repeatable. The scale is accurate and consistent, and does
not drift even over several minutes, PROVIDED that the weight changes
are swift.

QED?

--
Farry