Weight class required for scale calibration

B

beekun

#1
I have assumed a new role as calibration tech (in addition to QE duties) due to attrition. I have some digital scales to calibrate and need a new 1kg weight. Problem is - what class weight? Scale specs follow:
- capacity x readability = 0-2200g x 0.01g
- repeatability = +/-0.01g
- linearity = +/-0.02g
I was told a class F1 would work but everything metric I see online is rated by a numerical class 1 through 6.
Help me out please.
 
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C

crendfrey

#2
Greetings beekun,

The info you gave tells me you need a class 1 weight.
Class F wts are field standards used for scales with less than 10,000 divisions.

Your scale has 220,000 divisions. (capacity / resolution = divisions)
The minimum for class 1 wts is 50,000 divisions.
Any lessor quality of standard will introduce errors during calibration.
 
K

Kevin H

#3
Beekun, for more information on scale calibration than you probably want, the 2006 edition of "NIST Handbook 44, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices" is available as an Adobe pdf file download by going to the NIST web site. The specific web address to access the download options is: http://ts.nist.gov/ts/htdocs/230/235/h44-06.htm

If you just go to the general NIST site, and search around through it there are a lot of free (i.e. the US taxpayers already paid for the work) downloads available that provide good information to the technical professional.
 
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