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The BIPM Kibble balance for realizing the kilogram definition

After several years of development and continuous improvement of the BIPM Kibble balance, mass measurement of a 1 kg Pt/Ir artefact in terms of the Planck constant has been carried out. The paper describes the apparatus and its alignment, and explains the measurement and data processing. The balance operates in a one-mode and two measurement phase scheme using a bifilar coil. The mass value of the artefact was measured in vacuum with a relative standard uncertainty of 49 µg. This value differs from the value deduced from the calibration following the dissemination process after the redefinition of the kilogram by 15 µg.