Bilateral comparison of 1 Ω and 10 kΩ standards (ongoing BIPM key comparisons BIPM.EM-K13.a and 13.b) between INRIM (Italy) and the BIPM

Main text This report gives the result of a bilateral comparison of resistance between INRIM (Italy) and the BIPM carried out from October 2022 to February 2023. Two 1 Ω and two 10 kΩ travelling standards belonging to the BIPM were used. The comparison was carried out with an 'A-B-A' pattern of measurements; the standards were measured first at the BIPM for a period of about one month, then for a period of about one month and a half at INRIM, and finally again at the BIPM. The measurand was the 4 terminal dc resistance at low power. The BIPM was the pilot laboratory, and the comparison forms part of the ongoing BIPM key comparisons BIPM.EM-K13.a (for 1 Ω) and BIPM.EM-K13b (for 10 kΩ). The results from INRIM and the BIPM were found to be in good agreement, with a difference D smaller than the relative expanded uncertainty U c (95% confidence, k = 2) giving D = -0.074 × 10 -6 , U c = 0.134 × 10 -6 for 1 Ω and D = -0.045 × 10 -6 , U c = 0.174 × 10 -6 for 10 kΩ. To reach the main text of this paper, click on Final Report . Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/ . The final report has been peer-reviewed and approved for publication by the CCEM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).