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**Recognition Arrangement: the MRA and its implementation

The Mutual Recognition Arrangement or MRA, was drawn up by the International Committee of Weights and Measures (CIPM) under the authority given to it by the Member States of the Metre Convention, and signed in October 1999 by the directors of the NMIs
The MRA establishes mutual recognition of the national measurement standards and of the calibration and measurement certificates (Calibration Measurement Capabilities - CMC) issued by the NMIs.

To establish the mutual recognition criteria on an objective basis, this arrangement rests on :

This arrangement includes two sections: in the first one, signatories recognize the degree of equivalence of the national measurement standards of the participating NMIs; in the second section, signatories recognize the validity of the calibration and measurement certificates issued by the participating NMIs. A specific logo has been created, said logo can be applied to the calibration certificates issued by the NMIs, for CMCs published in the KCDB (Key Comparison DataBase du BIPM).

The Laboratoire national de métrologie et d'essais (LNE) is the metrology institute which mission is to implement the national metrological policy in France. As such, and as signatory of the MRA, LNE must meet its criteria for an effective recognition of the calibration possibilities in the French NMIs and the laboratories associated with the LNE.

The key points of the MRA

Objectives

Organisation

A database containing the result of the key comparisons of the national measurement standards and the lists of the NMIs’ calibration and measurement capabilities is available on the BIPM site.

Means implemented

Result

Commitment

The NMIs’ directors signing the Mutual Recognition Arrangement are doing so with the consent of the appropriate authorities of their respective countries. And in so doing, they :

A database containing the result of the key comparisons of the national measurement standards and the lists of the possibilities for calibration and measurement in the NMIs, is available on the BIPM site.

Schematic of the international metrology organization under the MRA

Schéma synoptique de l'organisation internationale de la métrologie dans le cadre du MRA