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  • 1. Bastos, M. C.
    et al.
    Hammarquist, M.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    A high-voltage test bed for the evaluation of high-voltage dividers for pulsed applications2011In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 60, no 7, p. 2462-2468, article id 5682402Article in journal (Refereed)
    Abstract [en]

    The design, evaluation, and commissioning of a high-voltage reference test bed for pulsed applications to be used in the precision testing of high-voltage dividers is described. The test bed is composed of a pulsed power supply, a reference divider based on compressed-gas capacitor technology, and an acquisition system that makes use of the fast measurement capabilities of the HP3458 digital voltmeter. The results of the evaluation of the reference system are presented. © 2006 IEEE.

  • 2.
    Bergman, Anders
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Nilsson, H.
    A Constant Voltage Source Based on a Mercury Battery1993In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 42, no 2, p. 365-367Article in journal (Refereed)
    Abstract [en]

    A constant voltage source based on a stable mercury battery has been developed at SP (Swedish National Testing and Research Institute). By using as active current compensation technique, the inherent high stability of a mercury battery can be retained up to a load current of several milliamperes.

  • 3.
    Bergman, Sixten
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    New reference measurement system for calibration of VLF high voltage2011In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 60, no 7, p. 2422-2426, article id 5746641Article in journal (Refereed)
    Abstract [en]

    A reference measuring system for 200 kV from very low frequencies (0.1 Hz, VLF) up to 50 Hz based on traditional high-voltage components, such as compressed gas capacitors, has been developed and verified. The verification of the measuring system has been performed by two experimental methods, one directly measuring the scale factor and one using measurements over the frequency and voltage range of the components of the measuring system. The frequency dependence of the measuring system proved to be one of the dominating uncertainties and was extensively researched. Proper correction for known errors and estimation of uncertainty contributions proved that traceable measurement of VLF voltage can be made with an uncertainty of less than 0.038% up to a voltage of 200 kV. This measurement service has been notified to be included in SP entries for Bureau International des Poids et Mesures key comparison database and can serve an important need for the cable industry. © 2006 IEEE.

  • 4.
    Bergsten, Tobias
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Eklund, Gunnar
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Tarasso, Valter
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Rydler, Karl-Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    An Active Filter for Delta-Sigma-Modulated Josephson Waveforms2015In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 64, no 6, p. 1559-1563Article in journal (Refereed)
    Abstract [en]

    We present the design and electrical characteristics of an active low-pass filter. It will be used in a reference waveform source based on a programmable Josephson voltage standard with multilevel delta-sigma modulation to generate accurate and spectrally pure arbitrary waveforms. The filter has a fifth-order Butterworth characteristic with high input impedance, low distortion, high stopband attenuation, and stable passband performance, including dc.

  • 5.
    Bergsten, Tobias
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Safety and Transport, Measurement Science and Technology.
    Rydler, Karl-Erik
    RISE - Research Institutes of Sweden (2017-2019), Safety and Transport, Measurement Science and Technology.
    Realization of Absolute Phase and AC Resistance of Current Shunts by Ratio Measurements2019In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 68, no 6, p. 2041-2046Article in journal (Refereed)
    Abstract [en]

    This paper presents a simplified method for realizing absolute phase and ac resistance for current shunts using only impedance ratio measurements. The method is based on three geometrically identical current shunts with different resistances, but with the same inductance, capacitance, and ac-dc resistance change of resistance at ac compared to dc). We demonstrate how the inductance, capacitance, and ac resistance can be calculated from the complex impedance ratio measurements, therefore realizing absolute current shunt impedance. The method gives competitive uncertainties of around 200 μΩ/Ω for amplitude and 400 μrad for phase at 1 MHz in the 1-Ω range.

  • 6.
    Bergsten, Tobias
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Rydler, Karl-Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Gunnarsson, Ove
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Eklund, Gunnar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Tarasso, Valter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    A precision current source using Δ-Σ modulation.2011In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 60, no 7, p. 2341-2346Article in journal (Refereed)
  • 7. Cerqueira Bastos, Miguel
    et al.
    Hammarquist, Maria
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    A High-Voltage Testbed for the Evaluation of High-Voltage Dividers for Pulsed Applications.2011In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 60, no 7, p. 2462-2468Article in journal (Refereed)
    Abstract [en]

    The design, evaluation and commissioning of a high voltage reference testbed for pulsed applications to be used in the precision testing of high voltage dividers is described. The testbed is composed of a pulsed power supply, a reference divider based on compressed gas capacitor technology and an acquisition system which makes use of the fast measurement capabilities of the HP 3458 DVM. Results of the evaluation of the reference system are presented.

  • 8.
    Eklund, Gunnar
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Bergsten, Tobias
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Tarasso, Valter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Rydler, Karl-Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Determination of transition error corrections for low frequency stepwise-approximated Josephson sine waves.2011In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 60, no 7, p. 2399-2403Article in journal (Refereed)
  • 9.
    Elg, Alf Peter
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Hällström, Jari
    MIKES Centre for Metrology and Accreditation, Finland.
    Kharezy, Mohammad
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Nieminen, Tatu
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Traceability and Characterization of a 1000 kV HVDC Reference Divider2015In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 64, no 6, p. 1709-1715, article id 7100891Article in journal (Refereed)
    Abstract [en]

    This paper presents the characterization of a resistive high-voltage dc (HVDC) reference divider and methods to establish traceability. The divider is designed for use as a laboratory reference for calibration of HVDC measuring systems up to 1000 kV. Targeting a measurement uncertainty of 20 μV/V at full voltage has put a focus on the temperature coefficients of the resistors, elimination of humidity dependence, and control of leakage currents in the high-voltage arm. A scale factor calibration against a 50 kV divider at 10 kV leads to an expanded uncertainty of 15 μV/V.

  • 10.
    Emardson, Ragne
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Hedekvist, Per Olof
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Nilsson, Mattias
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Ebenhag, Sven-Christian
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Jaldehag, Kenneth
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Jarlemark, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Rieck, Carsten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Johansson, Jan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik. RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Pendrill, Leslie
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Löthberg, Peter
    Nilsson, Håkan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Time Transfer by Passive Listening over 10 Gb/s Optical Fiber2008In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 57, no 11, p. 2495-2501Article in journal (Refereed)
  • 11. Gunnarsson, O.
    et al.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Rydler, Karl-Erik
    A method for calibration of partial discharge calibrators1999In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 48, no 2, p. 453-456Article in journal (Refereed)
    Abstract [en]

    A method for calibration of partial discharge calibrators has been developed based on passive integration of the induced charge. The voltage over a known capacitor is measured by a calibrated digital sampling voltmeter and the charge is calculated as the voltage multiplied by the capacitance. The best achieved uncertainty is ±2% with a coverage factor k = 2. © 1999 IEEE.

  • 12. Hallström, J.
    et al.
    Aro, M.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Bovier-Lapierre, V.
    Garnacho, F.
    Juvik, J. I.
    Kiseliev, V.
    Lian Hong, Z.
    Lucas, W.
    Li, Y.
    Pykälä, M. -L
    Rungis, J.
    Schon, K.
    Truong, V. H.
    Worldwide comparison of lightning impulse voltage measuring systems at the 400-kV level2007In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 56, no 2, p. 388-391Article in journal (Refereed)
    Abstract [en]

    An international comparison of lightning and switching impulse voltage measuring systems was arranged and coordinated by the Helsinki University of Technology (MIKES-TKK), Espoo, Finland, between 1999 and 2002. The number of participants was 26, including the coordinator. This paper summarizes the results obtained by those eight National Metrology Institutes that participated in the comparison. A 400-kV transfer reference measuring system for measuring lightning impulse voltages was prepared by the coordinator. In addition, a 1-kV impulse voltage calibrator system, including calibrators for both standard lightning and switching impulses, was circulated. © 2007 IEEE.

  • 13.
    Hällström, Jari
    et al.
    VTT Technical Research Centre of Finland, Finland.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Dedeoğlu, Serkan
    TÜBİTAK UME National Metrology Institute, Turkey.
    Elg, Alf Peter
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Houtzager, Ernest
    VSL Dutch Metrology Institute, Netherlands.
    Klüss, Joni
    Aalto University, Finland.
    Lehtonen, Tapio
    VTT Technical Research Centre of Finland, Finland.
    Lucas, Wolfgang
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Meisner, Johann
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Merev, Ahmet
    TÜBİTAK UME National Metrology Institute, Turkey.
    Nieminen, Tatu
    Aalto University, Finland.
    Schmidt, Matthias
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Suomalainen, Esa-Pekka
    VTT Technical Research Centre of Finland, Finland.
    Weber, Christian
    Trench Switzerland and France, France.
    Performance of a Modular Wideband HVDC Reference Divider for Voltages up to 1000 kV2015In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 64, no 6, p. 1390-1397, article id 7063966Article in journal (Refereed)
    Abstract [en]

    This paper describes the design and performance of a modular wideband high-voltage dc (HVDC) reference divider with a ratio uncertainty of less than 0.005% at 1000 kV. The divider has a maximum nominal voltage of 1000 kV when five 200-kV modules are stacked on top of each other. The divider is used for traceable calibration of HVDC measuring systems in customers' laboratories. The first priority in the design was the accuracy of HVDC measurements. In addition, the divider was designed to have wide bandwidth, both to enable measurement of ripple voltages and to prevent damage during possible flashovers.

  • 14.
    Hällström, Jari K.
    et al.
    Centre for Metrology and Accreditation, Finland.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Dedeoglu, S.
    TÜBITAK National Metrology Institute, Turkey.
    Elg, Alf Peter
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Houtzager, Ernest
    VSL Dutch Metrology Institute, The Netherlands.
    Lucas, Wolfgang
    Physikalisch-Technische Bundesanstalt, Germany.
    Merev, Ahmet
    TÜBITAK National Metrology Institute, Turkey.
    Meisner, Johann
    Physikalisch-Technische Bundesanstalt, Germany.
    Schmidt, Matthias
    Physikalisch-Technische Bundesanstalt, Germany.
    Suomalainen, Esa Pekka
    Centre for Metrology and Accreditation, Finland.
    Weber, Christian
    Trench Switzerland and France, France.
    Performance of a wideband 200-kV HVDC reference divider module2014In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 63, no 9, p. 2264-2270, article id 6754159Article in journal (Refereed)
    Abstract [en]

    This paper describes the design and performance of a wideband high-voltage dc (HVDC) reference divider module. The module has a nominal voltage of 200 kV, and it has been designed so that a number of modules can be stacked to extend voltages up to 1000 kV. The module, or a stack of modules, will be used for traceable calibration of HVDC measuring systems in customers' laboratories. The first priority in the design was the accuracy of HVDC measurements. In addition, the divider was designed to have wide bandwidth, both to enable measurement of ripple voltages and to prevent damage during possible flashovers.

  • 15.
    Högås, Marcus
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Rydler, Karl-Erik
    Stockholm Universíty, Sweden.
    Stenarson, Jörgen
    Stockholm Universíty, Sweden.
    Yhland, Klas
    Stockholm Universíty, Sweden.
    Analytic Solution of the Magnetic Field and Inductance in a Coaxial Short Circuit2015In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 64, no 6, p. 1582-1587Article in journal (Refereed)
    Abstract [en]

    In this paper, the analytic solution of the magnetic field and the inductance in a coaxial short circuit is derived from Maxwell's equations with the appropriate boundary conditions on the short circuit. Helmholtz equation is thus derived for the magnetic field and is solved by a mode matching technique. By integrating the absolute square of the magnetic field the inductance is obtained. The solution is discussed in the light of earlier approximations and solutions and is evaluated both theoretically and through measurements.

  • 16.
    Kampik, Marian
    et al.
    Silesian University of Technology, Poland.
    Grzenik, Michal
    Silesian University of Technology, Poland.
    Lippert, Torsten
    TRESCAL, Denmark.
    Rydler, Karl-Erik
    Silesian University of Technology, Poland.
    Tarasso, Valter
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Trinchera, Bruno
    Istituto Nazionale di Ricerca Metrologica, Italy.
    Comparison of a Thermal AC Voltage Standard in the 1 MHz to 30 MHz Frequency Range2021In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 70, article id 1500508Article in journal (Refereed)
    Abstract [en]

    The paper presents results of a comparison of a travelling AC voltage standard, which was a fused-silica NIST planar multijunction thin-film thermal converter (PMJTC). The AC-DC voltage transfer difference of the standard was measured at 2 V and selected frequencies from 1 MHz to 30 MHz against primary thermal AC voltage standards at SUT, INRiM, RISE and Trescal.

  • 17.
    Kluss, Joni
    et al.
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Elg, Alf Peter
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Wingqvist, Claes
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    High-Frequency Current Transformer Design and Implementation Considerations for Wideband Partial Discharge Applications2021In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 70, article id 6003809Article in journal (Refereed)
    Abstract [en]

    High-frequency current transformers are popular noninvasive inductive wideband sensors. Despite simplicity in design and operational principle, implementation of such sensors for partial discharge applications requires careful consideration, particularly in the higher frequency range where traveling wave attenuation and distortion is relevant. First, the role of design variables, including core materials, winding design, and shielding practices on sensor sensitivity and frequency characteristics (transfer impedance) are presented. Next, the suitability of the constructed sensors for partial discharge applications is assessed. The designed wideband sensors are suitable for laboratory applications with standard measurement circuits and controlled conditions. The low-level magnitude and frequency spectrum of the discharge pulses hinders signal integrity in relation to the placement of the sensors within the measurement circuit, signal amplification, and pulse repetition rate (pulse resolution). To enable most stringent detection levels under 1 pC, efforts are needed in distortionless amplifier design and interference mitigation. 

  • 18.
    Mašláň, Stanislav
    et al.
    Czech Metrology Institute, Czech Republic.
    Šíra, Martin
    Czech Metrology Institute, Czech Republic.
    Skalická, Tereza
    Czech Metrology Institute, Czech Republic.
    Bergsten, Tobias
    RISE - Research Institutes of Sweden (2017-2019), Safety and Transport, Measurement Science and Technology.
    Four Terminal Pair Digital Sampling Impedance Bridge up to 1 MHz2019In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 68, no 6, p. 1860-1869Article in journal (Refereed)
    Abstract [en]

    This paper describes a new four terminal pair digital sampling impedance bridge designed for frequency range up to 1MHz and small impedances, such as shunts. The bridge is capable of comparing impedance standards of arbitrary ratios in a full complex plane from approximately 100 kΩ down to 50mΩ, limited by maximum achievable current 3 A. To keep low uncertainties a new multiplexer was designed and a very simple and fully automated linearity correction method based on the pair of calculable resistors was developed and validated. The paper describes the design and details of the bridge topology, basic uncertainty budget and first results of the validation. The expanded uncertainty of impedance module is about 50 μΩ/Ω at 1MHz for impedance ratios up to 1:16 and voltage drops above 10mV and the expanded uncertainty of a phase angle was about 360 μrad/MHz. Expanded uncertainty for frequency 100 kHz about 10 μΩ/Ω was reached. Typical expanded uncertainty for low impedance ratios below 1:1.1 is only 35 μΩ/Ω. Set of measurement of impedance standards of known values and a small international comparison of ac-dc and phase angle errors of current shunts were carried out to validate the bridge capabilities in wide range of impedances. The validation measurements showed the deviations of the bridge are below 35 μΩ/Ω and below 350 μrad at 1 MHz.

  • 19.
    Reymann, D
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Eklund, Gunnar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    A three-way, on-site comparison of the 10 V-Josephson voltage standards of the PTB, the SP and the BIPM1999In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 48, no 2, p. 257-261Article in journal (Other academic)
  • 20.
    Reymann, D
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Eklund, Gunnar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Comparison of the Josephson voltage standards of the SP and the BIPM1997In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 46, no 2, p. 220-223Article in journal (Other academic)
  • 21.
    Rydblom, Stefani Alita Leona
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Thornberg, Benny
    Mid Sweden University, Sweden.
    Measurement of atmospheric icing and droplets2020In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 69, no 8, p. 5799-5809, article id 8960291Article in journal (Refereed)
    Abstract [en]

    Icing conditions including atmospheric liquid water content (LWC) and size distribution of droplets were recorded close to the top of Mt. Åreskutan, 1260-m above sea level, Sweden, a place known for frequent severe icing. The findings are comparatively analyzed. Combitech IceMonitor was used to measure the ice load, and HoloOptics T41 was used to measure the atmospheric icing rate. A method to translate the digital output from HoloOptics T41 to a value between 0 and 100 is described and used. Two instruments were used for measuring LWC and the median volume diameter (MVD). We created a model of icing intensity based on the k-nearest neighbor (KNN) using wind speed, LWC, and MVD as input. The result indicates that more learning data decrease the error. An heuristic model of erosion/ablation was added to simulate the ice load, and the result was compared with that of the standard Makkonen ice load model. The Makkonen model is suitable for estimating the ice load using a 1-h temporal resolution. With a 1-min temporal resolution, the erosion/ablation needs to be modeled and included. Our observations show that conditions can alternate between icing and erosion/ablation within 1 min during an icing event.

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  • 22.
    Rydler, Karl-Erik
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    High precision automated meas­uring system for AC-DC current transfer standards1993In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 42, no 2, p. 608-611Article in journal (Refereed)
    Abstract [en]

    An automated measuring system for AC-DC current transfer standards has been developed at the Swedish National Testing and Research Institute (SP). The use of a guard makes intercomparisons with ppm precision possible at frequencies up to 100 kHz. Two multijunction thermal converters are used for evaluating the uncertainty of the system.

  • 23.
    Simonsson, Pär
    et al.
    Volvo, Sweden.
    Rydler, Karl-Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP – Sveriges Provnings- och Forskningsinstitut.
    Level dependence of AC-DC transfer devices1999In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 48, no 2, p. 395-398Article in journal (Refereed)
    Abstract [en]

    A new method based on summing of phase controlled AC voltages makes it possible to compare thermal voltage converters with a ratio of 2:1 without introducing any error due to level dependence. The method is used to determine the level dependence of thermal voltage converters up to 1 kV and 100 kHz. The level dependence is compared to the change of AC-DC transfer difference due to power dissipation in the range resistor and due to DC-effects in the thermal converter. The results for two investigated TVC's indicate that the power dissipation is the only cause of level dependence in the range resistor of a high voltage TVC.

  • 24.
    Simonsson, Pär
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP – Sveriges Provnings- och Forskningsinstitut.
    Svensson, Stefan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP – Sveriges Provnings- och Forskningsinstitut.
    Rydler, Karl-Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP – Sveriges Provnings- och Forskningsinstitut.
    A comparison of power measuring systems1997In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 46, no 2, p. 423-425Article in journal (Refereed)
    Abstract [en]

    An automatic zero-power-factor standard has been designed and compared with a digital sampling wattmeter standard. The agreement of the two power measuring standards at 120 V, 5 A, and zero power factor is within a few uW/VA. The paper describes the standards, the phase errors and uncertainties of the two standards

  • 25.
    Stenarson, Jörgen
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Yhland, Klas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Uncertainty Propagation Through Network Parameter Conversions2009In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 58, no 4, p. 6-Article in journal (Refereed)
    Abstract [en]

    This paper describes a simplified procedure to obtain the uncertainties when converting a set of network parameters to another form. The method is based on a general matrix transformation technique. The technique relies on a transformation matrix that describes the relation between two network parameter definitions and two matrix equations. This paper extends the technique with two new matrix equations to also transform the uncertainties in the network parameters by relying on the same transformation matrix. The proposed method is exemplified by the conversion of S-parameter measurements with uncertainty (of a 30-dB attenuator) to G21 with uncertainty. The proposed method for uncertainty conversion is also compared with an analytic expression for S-parameter to G21 conversion.

  • 26.
    Svensson, S
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Verification of a calibration system for power quality instruments1998In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 47, no 5, p. 1391-4Article in journal (Other academic)
  • 27.
    Svensson, Stefan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Rydler, Karl-Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    A measuring system for the calibration of power analyzers1995In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 44, no 2, p. 316-317Article in journal (Refereed)
    Abstract [en]

    A digital sampling wattmeter has been designed for calibration of power analyzers. The wattmeter is based on two commercially available sampling DVM's. The power spectrum is calculated with DFT analysis. High accuracy is achieved by phase locking and simultaneous sampling.

  • 28.
    Tarasso, Valter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Phase comparison of high-current shunts up to 100 kHz2011In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 60, no 7, p. 2359-2365Article in journal (Refereed)
1 - 28 of 28
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