Ac–dc transfer measurements of highest accuracy with synchronous analogue-to-digital conversion

Ihlenfeld, W. G. Kurten; Mohns, E.

doi:10.1088/0026-1394/41/3/001

Cited by 9 publications

(4 citation statements)

References 3 publications

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“…For the largest aperture time selected (T a = 400 µs) and signals from about 20 Hz to 100 Hz, the agreement between the two systems is better than 1 µV V −1 . These last results are very similar to those reported in [18,19]. For aperture times between 50 µs and 100 µs, the agreement is of the same order for signal frequencies between 100 Hz and 400 Hz.…”

Section: Dynamic Characterizationsupporting

confidence: 90%

Characterization of analogue-to-digital converters of a commercial digital voltmeter in the 20 Hz to 400 Hz frequency range

Espel¹,

Polétaeff²,

Bounouh³

2009

Metrologia

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This paper describes the result of work performed at the Laboratoire National de Métrologie et d'Essais (LNE) aiming at characterizing the metrological performance of analogue-to-digital converters of a commercial digital voltmeter in the 20 Hz to 400 Hz frequency range. In order to reach uncertainties at the 10−6 level, ac–dc thermal transfer techniques have been used to determine the most suitable sampling parameters for these digitizers with respect to the measured signal frequency. Under such conditions, the agreement between the sampling technique and thermal ac–dc transfer is of the order of 2 µV V−1.

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Section: Dynamic Characterizationsupporting

confidence: 90%

Characterization of analogue-to-digital converters of a commercial digital voltmeter in the 20 Hz to 400 Hz frequency range

Espel¹,

Polétaeff²,

Bounouh³

2009

Metrologia

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“…A calibrated multijunction TC (MJTC) was used in a fast synchronous ac-dc transfer measurement system, as described [15]. The deviations of each measurement with respect to the MJTC (i.e., MJTC mean is the zero reference line) is shown in Fig.…”

Section: B Ac Differential Measurementsmentioning

confidence: 99%

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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“…The precision is known to be improved dramatically by providing a feedback path of a voltage follower with another voltage follower [7]. We built a precision buffer amplifier [8] of the kind developed by Ihlenfeld at PTB (Physikalisch‐Technische Bundesanstalt, Germany), and compared it to our original design.…”

Section: Circuit Configurationmentioning

confidence: 99%

Development of an extremely precise buffer amplifier for AC shunt standards at audio frequencies

Kon¹,

Yamada²

2011

Electrical Engineering Japan

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SUMMARYThe National Metrology Institute of Japan (AIST, NMIJ) launched a project for the development of AC shunt standards. AC shunts allow the most precise measurement of current. A high-precision AC shunt is an important component of nonsinusoidal power standards. The AC shunt calibration system helps improve the uncertainty assessments of the national primary power standards. The calibration system design with uncertainties of up to 10 ppm requires a precise buffer amplifier which has uncertainties of up to 1 ppm in the frequency range from 10 Hz to 10 kHz, with other uncertainty components taken care of. The two buffer amplifiers dealt with in this paper were verified to have errors within 2 ppm and uncertainties within 1 ppm in in-phase and quadrature error in the frequency range from 10 Hz to 10 kHz. This also implies a possibility of reducing both in-phase and quadrature error at 10 kHz within 1 ppm, by taking advantage of both features. This paper describes the circuit design and evaluation results of two different buffer amplifiers. © 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 178(4): 24-31, 2012; Published online in Wiley Online Library (wileyonlinelibrary.com).

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Ac–dc transfer measurements of highest accuracy with synchronous analogue-to-digital conversion

Cited by 9 publications

References 3 publications

Characterization of analogue-to-digital converters of a commercial digital voltmeter in the 20 Hz to 400 Hz frequency range

Characterization of analogue-to-digital converters of a commercial digital voltmeter in the 20 Hz to 400 Hz frequency range

An Automated Josephson-Based AC-Voltage Calibration System

Development of an extremely precise buffer amplifier for AC shunt standards at audio frequencies

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