NMIJInternational Metrology Cooperation Office

International Cooperation Office
AIST Tsukuba Central 3, Tsukuba,
Ibaraki 305-8563, Japan

TEL +81-29-861-4149
FAX +81-29-861-4202

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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 24660 as of June 2014. Japan has been registered 1112 CMCs which is ranked in 7th place in the world. (Table 1)


Table 1. The number of registered CMC 10 major countries ( as of June 2018 )
  Country Acoustics, Ultrasound and Vibration
Mass and Related Quantities
Length
Photometry
and
Radiometry
Thermo-
metry
Time
and Frequency
Electricity
and Magnetism
Ionizing Radiation
Chemistry
Total
AUV M L PR T TF EM RI QM
1 United States 32 108 49 114 89 11 321 529 636 1889
2 Russia 72 68 23 110 143 36 326 329 621 1728
3 Germany 76 204 97 83 117 25 164 266 524 1556
4 China 56 67 78 27 50 34 180 195 836 1523
5 United Kingdom 11 48 55 136 62 12 173 180 451 1128
6 Japan 8 95 42 49 44 31 55 259 543 1126
7 Korea 56 50 41 41 74 24 90 214 510 1100
8 France 63 105 27 30 101 11 131 303 125 896
9 Netherlands, The 0 85 72 32 76 26 206 78 246 821
10 Mexico 40 111 34 0 0 0 142 51 329 707

Total by
Metrology Area
AUV M L PR T TF EM RI QM Grand Total
1251 2791 1626 1348 2660 767 4366 4101 6178 25088

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.


International Comparison

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.

figure1

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. 1395 of international comparisons are registered in KCDB as of April 2016. Japan is ranked in the 4th place in the world with 562 international comparisons participations. (Table 2)


Table 2. The number of participation to the international comparison ( as of June 2018 )
  Country 1999 June. 2009 May. 2010 May. 2011 Apr. 2012 May 2013 May 2014 Nov. 2015 Dec. 2016 Aug. 2017 Feb. 2018
1 Germany 59 505 530 547 575 600 627 683 698 719 730
2 United States 51 361 384 400 417 432 450 481 485 501 505
3 Japan
(NMIJ)
42 319
(312)
341
(333)
361
(353)
390
(381)
407
(396)
427
(420)
462 476
(450)
491 496
(485)
4 United Kingdom 70 376 391 403 422 432 448 478 479 488 492
5 France 48 332 353 369 389 406 430 451 465 475 483
6 Korea 16 269 288 303 332 354 378 395 410 423 428
7 Russia 30 270 287 301 322 340 360 392 408 422 431
8 China 28 227 242 253 277 302 323 352 366 381 387
9 Italy 15 223 236 244 257 272 282 293 299 302 308
10 Australia 17 211 224 233 249 257 269 281 286 299 301

Grand Total of
International Comparisons
1999 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
  -   879 936 1003 1081 1188 1278 1343 1453 1499 1529