New Pilot Study Enhances Accuracy of AC Voltage Comparisons

The BIPM and NIST have successfully conducted a new pilot study, marking a significant advancement in the accuracy and reliability of ac voltage comparisons. This achievement represents a major step forward for on-site comparisons of ac voltages.

The BIPM and NIST collaborate on the development of a new generation Kibble balance

As part of this collaboration, NIST welcomed Dr Franck Bielsa from the BIPM Kibble balance group for five months in their team.

Dissemination of the kilogram from the second Consensus Value

The second Consensus Value, the internationally agreed mean of the kilogram realizations, will come into force on 1 March 2023. The final report of the most recent key comparison used for the 2023 calculation is available in Metrologia. 

Completion of the second key comparison of kilogram realizations

Human- and machine-readable key comparison reports using the PDF/A-3 format

The BIPM is pleased to announce the publication of the first key comparison report embedding machine-readable versions of the document.