Primary AC Power Standard Based on Programmable Josephson Junction Arrays

Palafox, L.; Ramm, G.; Behr, R.; Ihlenfeld, W. G. Kurten; Moser, Harald

doi:10.1109/tim.2007.891092

Cited by 66 publications

(23 citation statements)

References 11 publications

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“…Hitherto conducted investigations corroborate its metrological feasibility. Compared with other developments [4], [5], [16]- [18] our system represents a quantum vector voltmeter, which uses adaptive digital control for dynamic frequency synchronization and phase alignment of signals to allow either direct measurements (e.g., for ADC characterization) or differential measurements (e.g., for DAC characterization). The ADC sampling window is also aligned comfortably with high phase accuracy on the PJVS' plateaus after selecting the desired DVM settling time allowance.…”

Section: Discussionmentioning

confidence: 99%

“…Many NMIs have endeavored efforts toward developing quantum-based ac power standards [16]- [18], either by using direct measurements [18], or by determining amplitudes via differential measurements with signals phase aligned with a PJVS [16], [17]. Measurement uncertainties for ac power at power frequencies are not limited by low voltage measurements with a PJVS, but by transducers, since traceability must be ensured at higher magnitudes.…”

Section: Product Of Ac Voltages and Ac Powermentioning

confidence: 99%

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An Automated Josephson-Based AC-Voltage Calibration System

Ihlenfeld

Landim

2015

IEEE Trans. Instrum. Meas.

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This paper describes a new calibration system developed at INMETRO to guarantee traceability of lowfrequency alternating current (ac) voltage calibrations (<1 kHz) to a programmable Josephson ac waveform synthesizer. The automated full-synchronous system allows the synchronization of a commercial calibrator or signal synthesizer with a programmable Josephson voltage synthesizer system to be made by employing digital sampling and signal processing techniques, aided by adaptive digital control. It allows accurate determination of the spectral content of ac signals with minimum human intervention. System operation, measurement techniques, and data analysis are detailed. Index Terms-AC voltage, digital signal processing, Josephson, measurement standards, power, spectral analysis. Waldemar G. Kürten Ihlenfeld was born in União da Vitória, Brazil, in 1960. He received the B.Eng. degree from the Federal University of Paraná, Curitiba, Brazil, in 1983, and the M.Eng. and Ph.D. (magna cum laude) degrees in electrical engineering from Braunschweig Technical University, Braunschweig, Germany, in 1994 and 1997, respectively. He was with the Central Laboratory, LAC, Curitiba, from 1983 to 1999, a research institute of the Federal University of Paraná and the Power Utility Company of Paraná. From 1999 to 2013, he was with Physikalisch-Technische Bundesanstalt, Braunschweig, where he was involved in research and development of precision electronic circuits for ac power measurements, and mathematical modeling of sampling systems and investigating electro-thermal modeling of semiconductor devices. He is currently involved in developing sampling systems in the frame of the project Pronametro with the Instituto Nacional de Metrologia, Qualidade e he collaborated with the National Institute of Standards and Technology, Boulder, CO, USA, as a Guest Researcher in Josephson Systems. He is responsible for the dissemination of the Brazil legal volt and for maintaining internationally consistent and traceable voltage standards tied to the SI units. His current research interests include ac and dc Josephson voltage standards and quantum Hall systems and their applications in metrology, ac-dc transfer standards, and power and energy metrology.

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Section: Discussionmentioning

confidence: 99%

Section: Product Of Ac Voltages and Ac Powermentioning

confidence: 99%

An Automated Josephson-Based AC-Voltage Calibration System

Ihlenfeld

Landim

2015

IEEE Trans. Instrum. Meas.

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“…Applying (6)-(8) to (9) yields sin 2 (p/n) (p/n) 2 (p/n) 2 sin 2 (p/n) − 1, n ≥ 3 (11) This is an infinite series.…”

Section: First Seriesmentioning

confidence: 99%

Discussion on new properties of staircase waveform through connection to an infinite series

2015

IET Science, Measurement & Technology

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The staircase waveform produced by digital-to-analogue conversion is applied widely in electricity metrology, based on the known properties. However, a continuous investigation of new properties is still very important for its further applications. An infinite series is presented through analysis of the producing process of the staircase waveform. Based on the model of 'digitalto-analogue converter (DAC) aliasing effect', when the parameters of the series are extended from an integral to a real number, new properties are discussed. The concepts of 'asynchronous sampling ', 'sub-' and 'inter-harmonic' and 'under-Nyquist sampling' are derived into DAC. The more interesting phenomena are detailed. The results of simulations and experiments are reported.

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“…For better traceability, current developments combine directly a programmable ac Josephson voltage source into this system [5,6].…”

Section: Recent Improvementsmentioning

confidence: 99%