First of all I want to represent my test conditions. Office desk with PC, 5.1 system, printer, cell phone ...
ie all full of electronic equipment, the music was turned on and I ^^ a series looked.
Whether the table is in the water exactly I can not say. I have not been studied. The scale is from and
up and down run to several milligrams -> new turn again! Problem solved!
(Incidentally happens even expensive scales !!!)
The one result is displayed that is not seem sensible (Breakaway), is also possible with any scale.
Now to my cradle tests:
- Switch off after weighing process scale
- Repeat every 5 minutes weighing process
- X is the mean and the standard deviation s (x)
...... .... 1 cent 50cent ..... 1euro
.1 .... 2.29 g ..... ..... 7,87g 7,51g
.2 .... 2.29 g ..... ..... 7,88g 7,52g
.3 .... 2.29 g ..... ..... 7,89g 7,53g
.4 .... 2,28g 7,88g ..... ..... 7,52g
.5 .... 2,28g 7,87g ..... ..... 7,52g
.6 .... 2.29 g ..... ..... 7,89g 7,53g
.7 .... 2.29 g ..... ..... 7,88g 7,52g
.8 .... 2,28g 7,89g ..... ..... 7,52g
.9 .... 2,27g 7,88g ..... ..... 7,52g
10 .... ..... 2,28g 7,88g 7,52g .....
.x = 2,284g..x = 7,881g..x = 7,521g
s = 0,0067g.s = 0,0062g.s = 0,0042g
ie durschschnittliche accuracy is (+ -) 0,0057g.
the balance should weigh to 10mg, with a deviation of (+ -) 5mg. (+ -) 5,7mg is an incredibly good result !!!
--- All 3 coins together ---
.1 .... 17,68g
.2 .... 17,68g
.3 .... 17,68g
.4 .... 17,70g
.5 .... 17,66g
.6 .... 17,68g
.7 .... 17,68g
.8 .... 17,67g
.9 .... 17,67g
... X = 17,678g
... S = 0,0868g
ie the accuracy in this case is approximately (+ -) 8,7mg.
My fine scale in the laboratory (precision 0.0001 g) returns the following values for the coins:
m (1 cent) = 2,2815g .... deviation (x) = 2.5 mg
m (50cent) = 7,8808g ... deviation (x) = 0.2 mg
m (1euro) = 7,5240g .... deviation (x) = 3.0 mg
All 3 values are in the calculation of the test result of s = (+ -) 5,7mg.
m (1,51euro) = 17,6865g ... deviation (x) = 8,5mg
this value is also the interval of 8,7mg.
Reminder 10mg resolution, accuracy (deviation) (+ -) 5mg.
Whoever still complains about this product ... no comment ...
Who buy, weighing, joy =)
