Bilateral comparison of 1.018 V and 10 V standards between CSIR-NPL (India) and the BIPM, April to June 2022 (part of the ongoing BIPM key comparison BIPM.EM-K11.a and b)

Abstract

Main textAs part of the ongoing BIPM key comparison BIPM.EM-K11.a and b, a comparison of the 1.018 V and 10 V voltage reference standards of the BIPM and the CSIR National Physical Laboratory (CSIR-NPL), New Delhi (India), was carried out from September 2021 to April 2022. Two BIPM Zener diode-based travelling standards (Fluke 732B), BIPM_4 (Z4) and BIPM_5 (Z5), were transported by freight to the CSIR-NPL and back to the BIPM. In order to keep the Zeners powered during their transportation phase, a voltage stabiliser developed by the BIPM was connected in parallel to the internal battery. At the CSIR-NPL and the BIPM, the reference standard for DC voltage is a Programmable Josephson Voltage Standard (PJVS). The output electromotive force (EMF) of each travelling standard was measured by direct comparison with the primary standard.The final result of the comparison is presented as the difference between the values assigned to DC voltage standards by CSIR-NPL, at the level of 1.018 V and 10 V, at CSIR-NPL, U CSIR-NPL, and those assigned by the BIPM, at the BIPM, U BIPM, at the reference date of the 9th of December 2021. U CSIR-NPL - U BIPM = -2.91 μV; u c = 0.68 μV, at 1.018 V U CSIR-NPL - U BIPM = -4.97 μV; u c = 0.19 μV, at 10 Vwhere u c is the combined standard uncertainty associated with the measured difference, including the uncertainty of the realisation of the volt at the BIPM and at CSIR-NPL, and the uncertainty related to the comparison.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).