21.02.2024: 20th meeting of TC 1.9 "Ionizing Radiation and Radioactivity"


27.02.2024: BIPM training on e-learning for administrators and course creators

Metrological Harmonization

In the context of globalization, it is necessary to create a global system of measurements. This needs to consider four key elements:

  • A uniform system of harmonized national regulations in the field of legal metrology.
  • A uniform system of harmonized standards in the field of metrology unregulated.
  • A global recognition of the traceability of measurement results according to the SI (International System of Units).
  • And a global harmonization of requirements concerning the suitability of calibration and testing laboratories and certification bodies.

A direct efforts are made by the international organizations in their area of responsibility, and they  cooperate with each other to the search criteria and common understanding.

The OIML is working to establish the general principles of legal metrology and proposes to governments the most convenient ways to develop healthy policies in metrology. It does not interfere with the prerogatives of governments, but works towards ensuring that regional and national policies conform to internationally harmonized guidelines, that seek to eliminate technical barriers to trade and facilitate trade in goods and services, whose commercial value is based on measurements.

60 nations have signed the Treaty of the Meter Convention, which adopted the International System of Units (SI). At present, consistent with the overall approach, it increases the number of countries adopting by statute the SI system of units based on the metric system, with the consequent adoption of standards and measurement techniques involved.


The Convention gives authority to the General Conference of Weights and Measures (CGPM), which is the decision making body of the Meter Convention. It is responsible for making decisions in metrology and in particular in regard to the International System of Units. It consists of the delegates of the Member States of the Meter Convention and associated States, and meets every four years. The meetings are held at the premises of the International Bureau of Weights and Measures located in the city of Sevres, in suburban Paris.


The International Committee of Weights and Measures (CIPM) serves as the board of directors for the International Bureau of Weights and Measures (BIPM) through which the Committees and working in the direction of promoting international uniformity of measurements. Among its most important functions of the CIPM is to issue recommendations to GFCM on amendments to the International System of Units (SI), in response to scientific and technological advances.


The BIPM to ensure international uniformity of physical measurements are responsible for:

  • Establish the basic patterns and scales of key physical quantities.
  • Carry out and coordinate determinations regarding the physical constants.
  • Maintain the international prototypes.
  • Coordinate the comparisons of patterns of national metrology laboratories.
  • Ensure coordination of related techniques measurements.
Last Update: 19.02.2024 | Disclaimer & Copyright | Print-Version
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