As measurement instrument the weighing instrument has a very good measurement accuracy compared to some other measurements in processes. To know the characters of the weighing instrument the user must be able to evaluate it. The calibration is one method to show this working capacity of weighing instruments. The user must be able to define the values for permissible error of indication as well as the needed uncertainty of the calibration. The practice has shown that in the most cases it is adequate to indicate these values as scale intervals and it is as well a very pragmatic way to estimate the capability of weighing instruments. How can the user argue these values without careful analysis? The manufacturers give technical data of weighing instruments and the user can make good use of it. In most cases these values can be reached only in the best environmental circumstances even lower accuracy were sufficient. The analysis over some thousand-calibration results gives indication to evaluate the needed calibration uncertainty of weighing instruments in practice.
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