On 25 Aug 97 at 22:45, Robert Lunn wrote:

> Jacques Vrey wrote:
>
> > In answer, The following:
> >
> > - 5Kg
> > - no more than 500g(probably less)
> > - 1 (0-5Kg)
> > - vertical mass measurement
> > - anything
> >
> > Exceptional accuracy is not critical (Glorified Kitchen Scale)
>
>         Jacques, If I'm reading you right you want to
>         weigh 5000 grammes by 1 gramme.
>
>         That's 5000 grads!
>
>         This is not a glorified kitchen scale.
>
>         Can we maybe reduce this by an order of magnitude?

I'd be inclined to reduce it to PIC A/D proportions - probably the
14000, since the 16c7x is only 8bits resolution, much too coarse to
be any use, unless you stuffed around a lot with ranging.
This would give the 5000 graduations easily - in fact, data sheet
indicates it could go up to 65536 ...  The harder part would be the
analog circuit - I seem to recall they are somewhat prone to drift
with temperature.
A scale that could measure down to fractions of a gram would be
somewhat useful - counting things - measuring correct ratio of
sulphur / charcoal / potassium chlorate etc (no, I don't make this in
5k lots!) <g>
MikeS
<mikesmith_oz@relaymail.net>

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