On Sat, Feb 1, 2014 at 6:57 AM, <leop_at_lyradev.com> wrote:
>
>
> I wish the Mini-digital still was available in the 10g version rather than
> only in the 20g version. Both versions use a 14 bit analog to digital
> converter. This allows only one part in 16384 precision, not quite 1
> milligram out of 20g. So, this 20g scale is really only good to 2mg
> accuracy at best. However, the other 20g scales are also seem have 14 bit
> AD converters so there is no advantage in buying t! hem.
>
> Thanks, Leo, for good reading on the scales!
My old milligram scale starts to show the symptoms you described, with the
values and zero point drifting. So I decided it is time to get a new one.
Did not pay much attention to the range, until reading your note, and
realized that the new scale is actually up to 30mg! (similar to this one:
http://www.ebay.com/itm/Trendy-30g-0-001g-LCD-Digital-Portable-Jewelry-Pocket-Scale-G-GN-CT-OZ-OZT-DWT-/400517095447?pt=US_Pocket_Digital_Scales&hash=item5d40ade017)
A closer look revealed, that while the plastic chassis is similar, the
scale is in some parts different: the weighting platform is larger than in
the old type of scale. Also the electronics seem different, the new one has
very pronounced delay when turning it (the button needs to be pressed for
two seconds before it powers up - I was first fooled to think that I have a
defective unit as it did not power up - I though!). So maybe the new
electronics has more than 14 bit AD, too? It seems to give similar reading
and similar resolution as my old milligram scale. (Also the slot for test
weight not has a bubble level in it.)
-Tapio-
Received on Mon Feb 03 2014 - 00:27:12 CET