I think you have missed the point Ron was making about electronic scales
timing out.
Ron was at my house looking at my Europa when he tested my scale for this
problem. I have a My Weigh 3001, which has a 1 gram accuracy.
Ron tore up a piece of paper and placed it on the scale. It weighed 3
grams.
He took the paper off the scale and then put the paper back on a little at a
time over about 5 seconds. The scale showed 0, yes ZERO.
I just reran the experiment with 2 sheets of paper that weigh 5 grams.
I riped them into 9 pcs and placed them on the scale at 1 sec intervals,
the scale read 0. When I lifted the paper it read -5 grams.
This means that if you are adding the last bit of epoxy/hardener to the cup
slowly to get the weight exact you may not be where you think you are.
The way to check this is to lift the cup off the scale and it should go
back to
zero of the last reading you had.
John, A230
Subject: Re: Europa-List: Caution for those using Electronic Scales ? Mix
info
<mx@crixbinfield.freeserve.co.uk>
>
> > I wonder if any of you fine folks that have chosen an electronic scale
could
> > try this test. I have yet to purchase one but will soon. Speaking with
my new
> > friend Jeff on Thursday night, I had thought of purchasing the Ohaus
c200.
> > Can anyone make a brand and model recommendation that can pass scrutiny?
> > Much thanks.
> > Brian
>
> I have an Ohaus LS200, bought in 1996, I expect there is a new model by
now.
>
> It passes the test and I have never noticed any anomolous behaviour with
it. As
> said previously, it powers down (losing your reading) after several
minutes of
> inactivity. This can be prevented by tapping the scale to disturb the
reading,
> the timeout starts again. I have been very happy with it.
>
> For builders using the Ampreg epoxy, SP ask for a mix tolerance of 1% (for
> optimum performance, no doubt). Does anyone know what the 'official' mix
> tolerance is for Redux (or whatever it is called at the moment) ?
>
> Johnh Clif
> #0259
>
>
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