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4. Architecture of the mass measurement chain
The purpose of a measuring instrument is to express the value of an observed quantity in a way that is comprehensible to the user.
To achieve this, a measuring instrument uses sub-assemblies, constituting the measuring chain, which perform functions that can be summarized as follows:
interface with the quantity being measured ;
sensor ;
transducer ;
calculator ;
indicator.
All measuring instruments use this functional structure. However, functions can be so closely interwoven that they cannot be physically separated. They may be reduced to transmitting the same information they receive to the next function.
The flow chart...
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Architecture of the mass measurement chain
Non-automatic weighing instrument (NAWI)
Regulations
European Directive 2014/31/EU of the European Parliament and of the Council of February 26, 2014 on the harmonization of the laws of the Member States relating to the making available on the market of non-automatic weighing instruments (OJEU of March 29, 2014).
European Directive No. 90/384/EEC of June 20, 1990 on the harmonization of the laws of the Member States relating to non-automatic weighing...
Statistical and economic data
1. Standards
A working standard can be either a weight or a standard mass.
Weight is a legally marked mass; its shape (dimensions), composition (material), nominal value, maximum permissible error and marking are regulated.
A marked mass is a material object used to determine the mass of a body. A marked mass is not required to meet...
Standards and norms
European standard ( http://www.afnor.fr )
- Aspects métrologiques des instruments de pesage à fonctionnement non automatique. - NF EN 45501 - 2015
- Critères généraux pour le fonctionnement des différents types d'organismes procédant à l'inspection. - NF EN ISO/CEI 17020...
International standards
Directory
Bureau de la métrologie (part of the Ministry of the Economy, Industry and the Digital Economy and the General Directorate for Enterprise)
http://www.entreprises.gouv.fr/metrologie/
International Organization of Legal Metrology (OIML)
...Websites
EUROPA, European Union server
Official Journal of the European Union
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