CMC and International Comparison
CIPM MRA and CMC
In response to economic globalization, the Comité International des Poids et Mesures (CIPM) Mutual Recognition Arrangement (MRA) was signed in 1999 by the CIPM that is consisted of the individual countries with represented by National Metrology Institutes (NMIs), signatories to the Meter Convention. This CIPM MRA is a historic agreement for the wider acceptance of National Measurement Standards and of Calibration and Measurement Certificates issued by their institutes, and thereby provide governments and other parties with a secure technical foundation for wider agreements related to international trade, commerce and regulatory affairs.
For example, under the CIPM MRA, each country relies and recognizes mutually the traceability system of the national measurement standards of other NMIs and approves the calibration data as in equilibrium and acceptances the calibration and measurement certificates. When the testing instrument is traceable to the own national measurement standards, the measurement and calibration certificate of product is also approved in other countries.
In order to achieve the goal of the CIPM MRA, National Metrology Institutes (NMIs) and Designated Institutes (DIs) in individual countries develop and maintain their national measurement standards and declare the Calibration Measurement Capabilities(CMC) by establishing the quality system, taking peer reviews by signatory NMIs and DIs, and participating the related international comparisons in each measurand. Once finally approved CMCs, the data will be registered in the database (KCDB Appendix-C) undertaken by BIPM, and they will be maintained and regularly updated as new CMCs are submitted or revised and approved. The number of CMC registrations is 24736 as of 13 April 2012. Japan has been registered 996 CMCs which is ranked in 8th place in the world. (Table 1)
|Country||Acoustic & Ultrasonics Vibration
|Time & Frequency
|Photometry & Radiometry
|Mass & Related Quantities
|Electricity & Magnetism
|Radioactivity & Ionization
|Amount of Substance
The CIPM MRA organizes the framework of ensuring the international reliability and promotes the barrier-free trade. Ensuring the traceability of the registered CMCs, the test certificate will be surely available across borders when the reliability of the data attached products and foods are requested to show to the customers and the regulating authority.
The result of the international comparison is a vital evidence to declare CMCs for NMIs and DIs as it is stated above. In each Consultative Committee which is set up every metrology field under the CIPM, key comparison that is an international comparison of the key in each field is conducted.
In principle, CIPM key comparison is conducted by the institutes which possess high technologies and abundant experiences in the field (normally by NMIs and DIs of CC members). After the CIPM key comparison, those institutes are regarded as pilot laboratories and they conduct RMO (Regional Metrology Organization) key comparison. RMO members and other laboratories may participate in the RMO key comparison.
The result of RMO key comparison is linked to the CIPM key comparison through the institutes participated in the CIPM key comparison, and it will be a vital evidence to declare CMCs as well as the result of the CIPM key comparison. Meanwhile, the supplementary comparison is individually conducted by the RMO for which is not covered by the CIPM and RMO key comparisons.
These results of international comparisons are registered to the database which are undertaken by BIPM (KCDB Appendix-B) and updated on the website. 1081 of international comparisons are registered in KCDB as of April 2012. Japan is ranked in the 4th place in the world with 390 international comparisons participations. (Table 2)
|Country||1999||Apr. 2004||Jun. 2006||Aug. 2007||Jul. 2008||Jun.2009||May. 2010||May. 2011||Apr. 2012||May. 2013|