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Spirito M.,Technical University of Delft | Galatro L.,Technical University of Delft | Lorito G.,Iszgro Diodes BV | Zoumpoulidis T.,Iszgro Diodes BV | And 2 more authors.
86th ARFTG Microwave Measurement Conference: Microwave Measurements with Applications to Bioengineering and Biomedicine, ARFTG 2015 | Year: 2015

In this contribution we analyze the accuracy improvements of Reciprocal SOL planar calibrations when employing full-wave EM simulation to extract the standard's models. The calibration accuracy is benchmarked with the conventional (polynomial fit) standard definitions as well as with calibration techniques employing standards with partially-unknown parameters, as the LRM. Moreover, an outlook at a technology based on integrated circuit fabrication, employing fused silica substrates is described in terms of the achievable spread of its conductive and resistive layers. Such technology, in combination with the proposed EM modelling of the standards would allow to reduce the residual errors of planar calibrations. © 2015 IEEE.

Bosco G.C.,INRIM - Istituto Nazionale di Ricerca Metrologica | Garcocz M.,Federal Office of Metrology and Surveying BEV | Lind K.,Norwegian Metrology Service | Pogliano U.,INRIM - Istituto Nazionale di Ricerca Metrologica | And 4 more authors.
IEEE Transactions on Instrumentation and Measurement | Year: 2011

A comparison of the phase error of existing shunts for currents between 10 and 100 A and frequencies from 500 Hz to 100 kHz has been organized. Measurement processes were performed at Istituto Nationale di Ricerca Metrologica on some shunts using the first prototype of a new type of a phase comparator and a step-up method for data processing. Results of the relative measurement processes have shown good repeatability. The method for evaluation of reference values was based on similar shunts and suitable assumptions and derived by extrapolation. For the type of resistance elements employed in these shunts, the derivation of the reference is not very accurate and still needs to be improved. © 2006 IEEE.

Tarasso V.,Swedish National Testing And Research Institute | Zachovalova V.N.,Czech Metrology Institute | Mansten T.,Mittatekniikan Keskus Center for Metrology and Accreditation | Pogliano U.,INRIM - Istituto Nazionale di Ricerca Metrologica | And 2 more authors.
CPEM Digest (Conference on Precision Electromagnetic Measurements) | Year: 2010

This paper gives a survey of the performance of existing current shunts designed by National Metrology Institutes (NMI's) around Europe. Key characteristics for power measurement; phase displacement, ac-dc transfer difference and power coefficient of the shunt resistance is reported for 5A, 50 A and 100 A shunts. © 2010 IEEE.

Fellmuth B.,Physikalisch - Technische Bundesanstalt | Wolber L.,Physikalisch - Technische Bundesanstalt | Head D.I.,National Physical Laboratory United Kingdom | Hermier Y.,French National Conservatory of Arts and Crafts | And 12 more authors.
Metrologia | Year: 2012

An overview of the results of an international star intercomparison of low-temperature fixed points is given. Between 1997 and 2005, 68 sealed triple-point cells (STPCs) of the twelve laboratories represented by the authors were investigated at PTB. The STPCs are used to realize the triple points of hydrogen, neon, oxygen and argon as defining fixed points of the International Temperature Scale of 1990, ITS-90. The melting curves (MCs) of all STPCs have been measured on the same experimental equipment, adhering strictly to a single measurement program. This protocol enables separation of the effects influencing the MCs and direct comparison of the thermal behaviour of the STPCs, which are quite different with respect to design, age, gas source and filling technology. In the paper, special emphasis is given to the spread of the liquidus-point temperatures and to the uncertainty of their determination. Connections between the star intercomparison and completed and ongoing international activities are also discussed. © 2012 BIPM & IOP Publishing Ltd.

Bich W.,INRIM - Istituto Nazionale di Ricerca Metrologica | Cox M.G.,National Physical Laboratory United Kingdom | Elster C.,Physikalisch - Technische Bundesanstalt | Estler W.T.,7919 Hope Valley Ct. | And 9 more authors.
Metrologia | Year: 2012

The Joint Committee for Guides in Metrology, Working Group 1, JCGM-WG1, is currently revising the 'Guide to the Expression of Uncertainty in Measurement'. In this communication, the motivation for undertaking such a revision is given and the main changes with respect to the current, 2008 edition are outlined. © 2012 BIPM & IOP Publishing Ltd.

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