Re: Static charge and digital scales.

From: Jake Palmer <82.jake_at_gmail.com>
Date: Tue, 16 Jan 2018 08:38:37 -0800

I actually tossed a cheap scale because I was convinced it was not working
properly. I later discovered it was static that was creating the issue. I
find it particularly troublesome when weighing motors where I need a
consistent level of accuracy. Weighing a freshly cut motor several times
inside a small plastic cup on the scale produced variations of up to 10mg.
I now use a piece of 1/64 plywood on top of the scale. This seems to
eliminate the effects of the static, and I get much more consistent results.

On Tue, Jan 16, 2018 at 8:04 AM, Kurt Krempetz krempetz_at_yahoo.com
[Indoor_Construction] <Indoor_Construction_at_yahoogroups.com> wrote:

>
>
> Hi Don,
>
> I find this a very interesting post. I couple years ago when I
> started building gliders with foam flaps I believe I observed this same
> issue. If I weighed a foam flap especially just after sanding it down,
> the scale just displayed crazy readings. I found that if you let the part
> sit on the bench for about 1/2 day the readings seem to be correct or at
> least display reasonable numbers. Other solution I used is support the
> part just above the scale but not on the scale and take a reading, then
> lower the part onto the scale and take another reading, the difference
> between those two numbers seems to give the same answer as letting the part
> sit. I likely am not trying to get as accurate of weighs as you (I am
> weighing to the .01g) , so these solutions might not be applicable to your
> situation.
>
> Cheers,
> Kurt
>
>
>
> ------------------------------
> *From:* "don_at_slusarczyk.com [Indoor_Construction]" <Indoor_Construction_at_
> yahoogroups.com>
> *To:* Indoor_Construction_at_yahoogroups.com
> *Sent:* Tuesday, January 16, 2018 8:46 AM
> *Subject:* [Indoor_Construction] Static charge and digital scales.
>
>
> I am curious as to what others do in regards to eliminating effects of
> static charge when weighing on a digital scale. Since it is winter for me
> and humidity is low I am getting some static charge on wings and tails
> which cause the weights to vary. For the short term I have constructed a
> balsa "tower" that hold parts about 10" above the scale. That seems to work
> for smaller wings but a F1D wing needs to be much higher to get the scale
> out of the field. I only see this on plastic covered parts which makes
> sense. A motor stick or uncovered frame weighs are ok. I have tried Bounce
> anti cling dryer sheets but that takes time to discharge. Was hoping for a
> quick solution to discharge. I see they sell anti static devices for lab
> use but they are $2000 . Also read ionizers can work. Just curious as to
> what others have done.
>
> Don
>
>
>
>
Received on Tue Jan 16 2018 - 16:38:40 CET