Comparison of Digitizers for High-Precision Sampling Power Meters

Konjevod, Jure; Malarić, Roman; Jurčević, Marko; Mostarac, Petar; Dadić, Martin

doi:10.1109/tim.2019.2941260

Cited by 11 publications

(4 citation statements)

References 20 publications

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“…The DFT algorithm was applied to the acquired data to calculate relative phase differences between two current shunts in each step of the measurement method. Since the DFT algorithm, without any window function, is not immune to incoherent sampling, as elaborated in [24], the sampling rates and number of samples taken were varied, respectively, to ensure that the exact number of integer periods of the input signal was analyzed. The measurement results were obtained using the sampling frequencies shown in Table 2, chosen to ensure that the phase between each pair of shunts would be calculated using the same number of periods.…”

Section: Sampling Rate and Frequency Rangementioning

confidence: 99%

Evaluation of the Relative Phase Comparison Method at Its Limits Used for Absolute Phase Determination of an AC Cage Current Shunt Group

Gašparini,

Mostarac,

Konjevod

et al. 2023

Sensors

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AC current shunts are used for precise current measurements. The application of AC current shunts requires that their amplitude phase characteristics are known. A group of three geometrically identical current shunts and a reference shunt are observed in this paper. The phase characteristics of the reference shunt have been previously obtained. A relative phase comparison has been made between the three geometrically identical shunts, and phase displacement values for each have been obtained. After this, the results are verified with the reference shunt. The relative method is most suitable for shunts, where their respective RC and L/R values are small (compared with 1/ω) and of the same order. The ratios of the nominal resistance values of the shunts used in this paper are at the limit of the given statement. The conclusion is that the method applied at the mentioned limits, in terms of the metrology-grade phase angle determination of current shunts, is not to be considered reliable at frequencies higher than 1 kHz.

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Section: Sampling Rate and Frequency Rangementioning

confidence: 99%

Evaluation of the Relative Phase Comparison Method at Its Limits Used for Absolute Phase Determination of an AC Cage Current Shunt Group

Gašparini,

Mostarac,

Konjevod

et al. 2023

Sensors

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“…Commonly used samplers by NMIs include Keysight 3458A [7,[9][10][11][12][13]15,17], NI PXI cards 5922 [8,12,13,18,19] and 4461 [18,19], and Fluke 8588A [13]. Various countries have different post-processing algorithms to meet different application requirements [20]. This paper focuses on analyzing the post-processing algorithm based on the DFT algorithm.…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis of Phase Jitter in Differential Sampling of AC Waveforms Based on the Programmable Josephson Voltage Standard

Wang,

Sun,

Zhao

et al. 2024

Electronics

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The effect of phase jitter on differential sampling using the programmable Josephson voltage standard (PJVS) system is studied in this paper. A phase jitter model is established for the measured signal, and compensation coefficients for phase jitter removal are derived for three different post-processing methods based on the discrete Fourier transform algorithm (DFT). Based on our analysis, the phase jitter compensation coefficients are determined by the phase jitter angle distribution and harmonic order. Furthermore, after analyzing and simulating various common distributions, the phase jitter compensation coefficients have been verified. The simulation shows that when the standard deviation of the phase jitter angle is 20 ns, and the frequency of the measuring waveform is 3.46 kHz, the influence of the phase jitter is 1 × 10−7. The results of the simulation indicate that, in the differential sampling of AC waveforms using a PJVS system, phase jitter is one of the error terms for an uncertainty budget that cannot be neglected, particularly as the frequency of the measured waveforms increases.

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“…These digitizers are used in this work and have previously been the subject of several investigations using TVCs. For example, the use of a TVC to characterize the NI5922 digitizer is described in [12][13][14]. Josephson systems have also been used to calibrate TVCs.…”

Section: Introductionmentioning

confidence: 99%

A method for using Josephson voltage standards for direct characterization of high performance digitizers to establish AC voltage and current traceability to SI

Ireland

Reuvekamp²,

Williams³

et al. 2022

Meas. Sci. Technol.

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A method for traceability to SI for ac voltage and current based on high performance digitizers is presented. In contrast to the existing thermal-based methods, the proposed method utilizes direct traceability to quantum-based waveforms via the use of Josephson voltage systems. This allows not only a simplification of the traceability chain and reduced measurement times but also offers the potential for analysis of the ac voltage and current waveform spectral content, a feature which is not possible using thermal methods. Scaling of current and voltage is achieved by the use of current shunts and resistive voltage dividers respectively. Target operating ranges are up to 1 A and 100 V with a frequency range up to 1 kHz for both. The corresponding target uncertainty for this traceability route is 1 μVV-1 and 2 μAA-1 up to frequencies of 1 kHz. The traceability chain is described and various components are characterized to validate their suitability for this task. It is demonstrated that these uncertainty targets can be met under certain conditions. The use of multi-tone calibration waveforms is investigated to further reduce measurement time. An uncertainty analysis method based on simulation using real component performance data is demonstrated.

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Comparison of Digitizers for High-Precision Sampling Power Meters

Cited by 11 publications

References 20 publications

Evaluation of the Relative Phase Comparison Method at Its Limits Used for Absolute Phase Determination of an AC Cage Current Shunt Group

Evaluation of the Relative Phase Comparison Method at Its Limits Used for Absolute Phase Determination of an AC Cage Current Shunt Group

Simulation Analysis of Phase Jitter in Differential Sampling of AC Waveforms Based on the Programmable Josephson Voltage Standard

A method for using Josephson voltage standards for direct characterization of high performance digitizers to establish AC voltage and current traceability to SI

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