NMIJInternational Metrology Cooperation Office

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

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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 25726 as of Oct. 2020. Japan has been registered 1129 CMCs which is ranked in 6th place in the world. (Table 1)


Table 1. The number of registered CMC 10 major countries

    (as of 5 Oct. 2020, KCDB searching system: https://www.bipm.org/kcdb/)

  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 Russia 72 70 24 149 143 36 306 329 661 1790
2 United States 31 107 49 114 89 11 321 531 445 1698
3 China 56 68 79 63 57 34 180 195 946 1678
4 Germany 52 190 99 85 118 25 156 261 534 1520
5 Korea 56 50 40 41 71 29 100 214 606 1207
6 Japan 8 102 32 51 44 29 55 259 549 1129
7 United Kingdom 11 48 55 136 63 12 164 180 448 1117
8 France 63 104 27 30 102 19 134 297 138 914
9 Mexico 40 112 34 22 15 9 150 55 347 794
10 Netherlands 0 85 72 28 70 26 206 23 251 761

Total by
Metrology Area
AUV M L PR T TF EM RI QM Grand Total
1310 2839 1676 1477 2908 806 4407 3853 6450 25726

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. 1673 of international comparisons are registered in KCDB as of Oct. 2020. Japan is ranked in the 2nd place in the world with 538 international comparisons participations. (Table 2)


Table 2. The number of participation to the international comparison

    (as of 5 Oct. 2020, KCDB searching system: https://www.bipm.org/kcdb/)

  Country May. 2010 May. 2011 Apr. 2012 May 2013 May 2014 Nov. 2015 Dec. 2016 Aug. 2017 Feb.
2018
Mar. 2019 Mar. 2020
1 Germany 530 547 575 600 627 683 698 719 730 753 612
2 Japan
(NMIJ)
341
(333)
361
(353)
390
(381)
407
(396)
427
(420)
462 476
(450)
491 496
(485)
508
(501)
538
(526)
3 United States 384 400 417 432 450 481 485 501 505 515 527
4 United Kingdom 391 403 422 432 448 478 479 488 492 502 523
5 France 353 369 389 406 430 451 465 475 483 496 521
6 Korea 288 303 332 354 378 395 410 423 428 450 479
7 Russia 287 301 322 340 360 392 408 422 431 450 471
8 China 242 253 277 302 323 352 366 381 387 410 456
9 Italy 236 244 257 272 282 293 299 302 308 316 329
10 Australia 224 233 249 257 269 281 286 299 301 307 319

Grand Total of
International Comparisons
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
936 1003 1081 1188 1278 1343 1453 1499 1529 1588 1673