Key comparison CCEM-K7: AC voltage ratio

Abstract

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions?Contact the NRC Publications Archive team at PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous. This report provides the results of a key comparison, CCEM-K7, organised under the auspices of the Comité Consultatif d'Électricité et Magnétisme (CCEM) and carried out by a group of National Metrology Institutes (NMIs). The measured parameters were a set of ratios of a type of voltage transformer called an Inductive Voltage Divider (IVD). A single custom-made IVD -the Travelling Standard -was designed and used specifically for this comparison.

A new calibration setup for lock-in amplifiers in the low frequency range and its validation in a bilateral comparison

“…A conservative uncertainty u(|k IVD |) = 5 × 10 −7 was considered, including the effect of the loading from RVD. Drifts in time or due to transportation of IVDs are known to be extremely small (see [18], part 2, section 1.2), as well as the temperature coefficient (10 −8 /K or below for DT72, the manual version of the IVD here considered [19]) and can therefore be neglected.…”

“…A conservative uncertainty u(|k IVD |) = 5 × 10 −7 was considered, including the effect of the loading from RVD. Drifts in time or due to transportation of inductive voltage dividers (IVDs) are known to be extremely small (see [18], part 2, section 1.2), as well as the temperature coefficient (10 −8 K −1 or below for DT72, the manual version of the IVD here considered [19]) and can therefore be neglected. k RVD : The resistors R 1 and R 2 are measured as two-terminal (R 1 ) or four-terminal (R 2 ) standards in dc, with a calibrated precision multimeter.…”

Observation of individual spin quantum transitions of a single antiproton

“…The fractional precision of optical clocks based on single-quantum transition readout schemes has advanced to the level of 10 −18 [4]. Observations of single flux-quanta in superconductors provide sensitive magnetometers, represent accurate resistance standards, and measurements on quantized resistance in 2-dimensional electron gases led to precise measure-ments of the Planck constant [5,6]. Experiments based on the detection of individual quantum transitions of single trapped electrons provide the most precise measurement of the fine-structure constant [7].…”