EUROMET project no 429: Comparison of 10 V electronic voltage standards

Abstract

This report presents the results of a comparison of measurements on four electronic DC reference standards performed by national metrology institutes in the EUROMET region and BIPM. The results of the comparison, in terms of degrees of equivalence, show that there is a good agreement between the measurement results of the participants. The results also show that the time-dependent fluctuations in the output voltages of the travelling standards provide one of the main sources of uncertainty.Main text. 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 kcdb.bipm.org/.The final report has been peer-reviewed and approved for publication by the EUROMET, comparison identifier EUROMET.EM.BIPM-K11, according to the provisions of the Mutual Recognition Arrangement (MRA).

Accurate comparison between INRIM and a secondary calibration laboratory using a top-class multifunction electrical calibrator

“…NMIs and ILCs providers have to provide suitable ILCs to correctly verify the capabilities of secondary laboratories. ILCs concerning the calibration of only fixed electrical standards [1][2][3][4][10][11][12] unfortunately don't cover the wide operating fields of modern secondary electrical calibration laboratories. An instrument covering wide fields and used by INRIM for several years in ILCs with these laboratories is the 8.5-digit high precision DMM.…”

“…The traceability chain of the INRIM-Lab from national standards is shown in The measurement uncertainties of the two laboratories were respectively evaluated in calibration procedures respectively approved by INRIM as signatory of the CIPM MRA 1 and by the Italian calibration Accreditation body ACCREDIA. The uncertainties reported in the INRIM-Lab procedures were evaluated according to the criteria defined in [5].…”

“…Since decades, the measurement capabilities in the field of low frequency electrical quantities (DC and AC Voltage, DC and AC current and DC Resistance) among National Measurements Institutes (NMIs) have been verified by means of inter-laboratory comparisons (ILCs) regarding the calibration of fixed primary electrical standards as in [1][2][3][4]. These Institutes have the competence to correctly disseminate the low-frequency electrical units towards their working standards and instruments and towards secondary laboratories that operated with much higher measurement uncertainties than NMIs.…”