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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. Source


Lapuh R.,Slovenian Institute of Quality and Metrology
Conference Record - IEEE Instrumentation and Measurement Technology Conference | Year: 2011

An algorithm for the estimation of the frequency from asynchronously sampled harmonically distorted signals is described. Phase difference calculation in the time domain using a three-parameter sine fit algorithm is proposed as a basis for estimating the sampled signal frequency. Comparison with standard four parameter sine fit algorithm (4PSF) and three-point interpolated DFT algorithm (I3DFT) demonstrates improved frequency estimation for harmonically distorted signals when at least 2 signal cycles are sampled. © 2011 IEEE. Source


Lapuh R.,Slovenian Institute of Quality and Metrology
2010 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2010 - Proceedings | Year: 2010

This paper proposes an interpolated three-parameter sinewave fit method for estimating asynchronously sampled signal phase. The proposed method provides improved phase estimation of harmonically distorted signal compared to conventional three-parameter sinewave fit method with or without truncation to the closest integer number of cycles, especially when estimating phase from small number of sampled signal cycles. It is shown that the phase estimation accuracy strongly depend on the accuracy of the frequency used in the phase calculation. Measurement results confirm the simulations. © 2010 IEEE. Source


Lapuh R.,Metrology Institute of the Republic of Slovenia | Lapuh R.,Slovenian Institute of Quality and Metrology
IEEE Transactions on Instrumentation and Measurement | Year: 2015

This paper describes an algorithm for estimating the frequency, amplitude, and phase of the fundamental component in harmonically distorted waveforms. The algorithm minimizes the phase difference between the sine model and the sampled waveform by effectively minimizing the influence of the harmonic components. It uses a three-parameter sine-fitting algorithm for all phase calculations. The resulting estimates show up to two orders of magnitude smaller sensitivity to harmonic distortions than the results of the four-parameter sine fitting algorithm. © 1963-2012 IEEE. Source


Lapuh R.,Slovenian Institute of Quality and Metrology
CPEM Digest (Conference on Precision Electromagnetic Measurements) | Year: 2014

This paper describes the algorithm for estimating frequency, amplitude and phase of fundamental component in harmonically distorted waveform. The algorithm minimizes phase difference between sine model and sampled waveform by effectively canceling out the influence of harmonic components. It uses three parameter sine fit algorithm for all phase calculations. The resulting estimates show up to two order of magnitude smaller sensitivity to harmonic distortions than four parameter sine fit algorithm. © 2014 IEEE. Source

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