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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.


Pogliano U.,Instituto Nationale Of Ricerca Metrologica | Braun J.-P.,Federal Office of Metrology METAS | Voljc B.,Slovenian Institute of Quality and Metrology | Lapuh R.,Slovenian Institute of Quality and Metrology
IEEE Transactions on Instrumentation and Measurement | Year: 2013

This paper describes a software platform used for the testing of phasor measurement unit (PMU) algorithms. The platform is implemented in MATLAB and consists of two parts. The first one permits the insertion of the simulation parameters, whereas the second one is the actual simulator for the algorithms. This second program contains a waveform generator including modulation and filtering. It also permits the comparison between the results of the PMU algorithm against those of an 'ideal PMU' obtained by the parameters of the theoretical signal set. The platform has been functionally tested and used with a set of PMU algorithms. The platform is being used as a shared tool to quantify the uncertainties of the estimation algorithms developed in the framework of the European Metrological Research Project 'Smart Grids.' © 2013 IEEE.


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.


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.


Lapuh R.,Slovenian Institute of Quality and Metrology | Voljc B.,Slovenian Institute of Quality and Metrology | Lindic M.,Slovenian Institute of Quality and Metrology
IEEE Transactions on Instrumentation and Measurement | Year: 2015

This paper describes the mechanism of an Agilent 3458A sampling time jitter present when external triggering is used at synchronous two-channel sampling. Based on measurements, it is shown that the master digital multimeter (DMM) adds approximately 3.2 ns of its own time jitter while triggering the slave DMM and that the effective time jitter for externally triggered DMM remains at around 7 ns, well below ±50-ns maximum jitter as specified by the manufacturer. © 1963-2012 IEEE.


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.


Lapuh R.,Slovenian Institute of Quality and Metrology | Voljc B.,Metrology Institute of the Republic of Slovenia | Lindic M.,Metrology Institute of the Republic of Slovenia
CPEM 2016 - Conference on Precision Electromagnetic Measurements, Conference Digest | Year: 2016

This paper describes an accurate method to estimate active power of repetitive non-coherently sampled arbitrary signal. For that purpose the window technique was used on not pure sine wave signals where coherent sampling was not possible but the spectral components in the signal were well separated, at least for a few FFT bins. The actual performance of the method can be tuned by the selection of the appropriate time window (Hanning, Blackmann-Harris (BH92),..). © 2016 IEEE.


Ziade F.,French National Laboratory of Metrology and Testing | Kokalj M.,Slovenian Institute of Quality and Metrology | Pinter B.,Slovenian Institute of Quality and Metrology
CPEM 2016 - Conference on Precision Electromagnetic Measurements, Conference Digest | Year: 2016

This paper describes the measurement errors that could be obtained on four terminal pair impedance (Z4TP) measurements up to 13 MHz using a vector network analyzer (VNA). To highlight these issues different configurations of measurement have been set up: The use of different calibration kits to calibrate a VNA, the use of BNC-type N adapters. The knowledge of the impedance value of the load standard used during the calibration method of the VNA is one of the main issues to be carefully considered in order to perform accurate impedance measurement in the high frequency range. © 2016 IEEE.


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.


Lapuh R.,Slovenian Institute of Quality and Metrology | Mariscotti A.,University of Genoa
2012 IEEE I2MTC - International Instrumentation and Measurement Technology Conference, Proceedings | Year: 2012

Three frequency estimation algorithms are considered and their performance evaluated against real data, represented by pantograph voltage and current signals on AC railways. The three algorithms have different characteristics: the "four parameter sine wave fitting" (4PSF) algorithm is based on LSE against single frequency model, the "phase sensitive frequency estimation" (PSFE) algorithm is based on phase difference against a single frequency model and the "multi harmonic frequency estimator" MHFE is based on LSE against multi-harmonic frequency model. The results show that all algorithms can deal with highly distorted signals with various success and that none of them can be assigned a-priori as the best for a specific task. © 2012 IEEE.

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