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

Main text This report gives the result of a bilateral comparison of resistance between the CEM (Spain) and the BIPM carried out from March 2022 to September 2022. 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 at the CEM, 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 the CEM 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 = 0.056 × 10-6, U c = 0.106 × 10-6 for 1 Ω and D = 0.020 × 10-6, U c = 0.068 × 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). © 2023 BIPM & IOP Publishing Ltd.