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  metrology – in short 3rd edition  “metrology – in short” 3rd edition  July 2008 cover Photo of Great Belt east bridge, Denmark. Each of the east bridge’s 55 prefabricated 48-metre, 500-ton bridge sections were measured in detail in order to adjust the four hangers which carry the section, to ensure the correct tension. The measured, and expected, deviations from the theoretical measurements required a hanger adjustment of ± 30 mm. The adjustment of each hanger pin was determined to an accuracy of ± 1 mm.  A wide network of contractors and subcontractors from 10 European countries were involved in building the bridge 1988 - 1997. Reliable and verified measurements were essential in this huge and complex collaboration. by Preben Howarth Fiona RedgraveDanish Fundamental Metrology Ltd National Physical LaboratoryMatematiktorvet 307 Hampton Road, Teddington DK 2800 Lyngby TW11 0LW Denmark United Kingdom EURAMET project 1011, participants: DFM Denmark, NPL United Kingdom, PTB Germany photographer Søren Madsen, copyright: Sund & Bælt. design 4160-0708 print Schultz Grafisk, DK 2620 AlbertslundISBN 978-87-988154-5-7The copyright of this booklet is held by © EURAMET e.V. 2008. Permission for translation can be obtained from the EURAMET Secretariat. For further information, please consult the EURAMET website or contact the Secretariat: disclaimer “Metrology - in short” 3rd edition was commissioned by the iMERA project“Implementing Metrology in the European Research Area” project, contractnumber 16220, under the 6th Framework Programme and jointly financed bythe European Commission and the participating institutes. The findings,conclusions and interpretations expressed in this booklet are those of the authors and contributors only and should in no way be taken to reflect neither the policies or opinions of the European Commission.  3 summary The main purpose of “Metrology – in short” 3rd edition is to increase awareness of metrology and to establish a common metrological frame of reference. It is meant to provide users of metrology with a transparent and handy tool to obtain metrological information.Today’s global economy depends on reliable measurements and tests, which are trusted and accepted internationally. They should not create technical barriers to trade and a precondition for this is a widely utilised and robust metrological infrastructure.The content of this handbook is a description of scientific, industrial and legal metrology. The technical subject fields of metrology and metrological units are described. The international metrology infrastructure is detailed, including the regional metrology organisations such as EURAMET. A list of metrological terms is collected primarily from internationally recognised standards. References are given to institutions, organisations and laboratories by reference to their website homepages.“Metrology – in short” 3rd edition is commissioned by the iMERA “Implementing Metrology in the European Research Area” project, contract number 16220, under the 6 th  Framework Programme and jointly financed by the European Commission and the participating institutes.
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