Calibration of 1-D CMM artefacts: Step Gauges (EURAMET project 1365)

Tim Coveney, Michael Matus, Shihua Wang, Ville Byman, Antti Lassila, Nasser Alqahtani, Faisal Alqahtani, Dean Sumner, Jürg Spiller, Felix Meli, Gian Bartolo Picotto, Roberto Bellotti, Osamu Sato, Rina Sharma, Girija Moona, Vinod Kumar, Joaquín Rodríguez, Emilio Prieto, İlker Meral, Okhan GanioğluJosé Salgado, Adam Wójtowicz, Pavel Skalník, Vít Zelený, John Stoup, Gerard Kotte, Richard Koops, Edgar Arizmendi, Weinong Wang, Agneta Jakobsson, national Institute Metrology, Elena Dugheanu, Greg Reain, Gábor Szikszai

Research output: Contribution to journalReview Articlepeer-review

2 Citations (Scopus)


The results of the inter-RMO key comparison EURAMET.L-K5.2016 on the calibration of a step gauge are reported. Twenty-two National Metrology Institutes from four different metrological regions all over the world participated in this comparison which lasted three years, from December 2015 to December 2018.

Two artefacts were circulated so that the varying ranges of participants equipment could be accommodated. A 1020 mm ceramic monolithic step gauge remained stable throughout the comparison. A 610 mm steel step gauge changed length, possibly due to an impact while travelling between participants. The comparison of this artefact was divided into two groups, those before the damage and those after, with the reference value for each group derived from a linking participant who had demonstrated equivalence in the 1020 mm artefact circulation. For the 1020 mm comparison the inverse-variance weighted mean was taken as reference value.

Of the twenty two participants, eleven successfully demonstrated the validity of the claimed measurement capability. Of the remaining 11, 3 submitted revised uncertainties after the initial circulation of results which were shown to be valid when compared to the reference value. A set of recommendations and actions were agreed with the remaining participants.
Original languageEnglish
Article number04002
Issue number1
Publication statusPublished - 1 Jan 2020
MoE publication typeA2 Review article in a scientific journal


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