Re: Digital Scale Puzzlement

From: calgoddard <calgoddard_at_yahoo.com>
Date: Sat, 24 Jan 2009 01:32:07 -0000

LeRoy:

I have a relatively expensive Ohaus scale that measures down to
hundreths of a gram. It cost over $200 when I bought it several years
ago, but it has a nice big platen for holding rubber or plane parts
(entire wings) so I have been happy with it. It plugs into AC power
via a DC power supply.

When I get down to very low weights, I have observed a similar
situation. E.g. 1/32 spars for a small stab show zero weight
individually, until you weigh five together, and divide to find their
individual weight.

Someone told me that these digital scales have strain gauges that are
very sensitive to static charge on items being weighed. I am not sure
how that factors in.

I think to measure very low weights you need scales good to 1/1000 of a
gram. I have a friend with two such scales at his company. They cost
$2,500 each. These are mostly used in chemistry and pharmacology labs.
Received on Fri Jan 23 2009 - 17:32:12 CET