Articles
Calibrating Weighing Instruments - Part 2
November 25, 2007
•White Paper: Calibrating Weighing Instruments - Part 2
•White Paper: Calibrating Weighing Instruments - Part 1
Weighing is a common form of measurement in commerce, industries and households. Weighing instruments are often highly accurate, but users, i.e. their customers and/or regulatory bodies, often need to know just how inaccurate a particular scale may be. Originally, this information was obtained by classifying and verifying the equipment for type approval. Subsequently, the equipment was tested or calibrated on a regular basis.
Typical calibration procedures
Calibrating scales involves several different procedures depending on national- and/or industryspecific guidelines or regulations, or on the potential consequences of erroneous weighing results. One clear and thorough guide is the EA-10/18, Guidelines on the Calibration of Nonautomatic Weighing Instruments, which was prepared by the European Co-operation for Accreditation, and published by the European Collaboration in Measurement and Standards (euromet).
Typical scale calibration involves weighing various standard weights
in three separate tests:
- repeatability test
- eccentricity test
- weighing test (test for errors of indication)
In the pharmaceutical industry in the United States, tests for determining minimum weighing capability are also performed.
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