Classical Nonquantum AC Power Measurements With Uncertainties Approaching 1 ${\rm \mu}\hbox{W/VA}$

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

doi:10.1109/tim.2007.890620

Cited by 18 publications

(11 citation statements)

References 9 publications

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“…The derived uncertainty for the reference system including all possible contribution as shown in Table 1 is higher than the single channel sampling technique used in [3] and [4]. With improvement in VT and CT accuracy and their calibration uncertainties, the level of uncertainty of the system is bound to be significantly reduced.…”

Section: Resultsmentioning

confidence: 98%

“…This technique simplifies the operation and uncertainty calculations of the rms value. On the other hand, if we use a thermal converter (TC)-based calibration system together with the proposed reference electrical power system to determine the V u with a low level of uncertainty as described in [4], it may create complication in the whole system and more sophisticated software would need to be developed.…”

Section: Ac Voltage Measurementsmentioning

confidence: 99%

“…The DVM characteristics mentioned in Section 2.2 affect to the DFT amplitude uncertainty. Considering these factors the uncertainty can be determined analytically as mentioned in [4] or can be evaluated experimentally. In this study we used experimental method to evaluate the DFT ratio and DFT amplitude errors.…”

Section: Errors and Uncertaintiesmentioning

confidence: 99%

“…The analog-to-digital converters (ADCs) are more important when a sampling technique is being employed (more details can be found in [1] and [2]). The sampling technique, dual channel method successfully used Correspondence: wije@kriss.re.kr in [1] and [2] and single channel method was used in [3] and [4], was employed by a few NMIs recently. The method used single channel obtained low level of uncertainty with the phase-lock loop (PLL) synchronization, but the dual channel sampling method achieved high level of uncertainty.…”

Section: Introductionmentioning

confidence: 99%

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An improvement for dual channel sampling wattmeter

Wijesinghe

Park

2010

Int. J. Metrol. Qual. Eng.

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Abstract. We present a digital sampling algorithm that uses two high resolution integrating voltmeters that are synchronized by a phase-lock loop clock to accurately measure the active and apparent power parameters for sinusoidal power measurements. The developed system provides high precision measurements of the root mean square, phase and the complex voltage ratio of the ac signal with sophisticated algorithm which process the data in frequency domain. The system was designed to be used at the Korea Research Institute of Standards and Science as reference power standard for electrical power calibrations. The detail uncertainty calculations have shown that the accuracy of the measurements were better than 4 μW/VA (for k = 1) and the level of uncertainty was valid for the power factor range 0 ∼ 1 for both lead and lag conditions. The system is fully automated and allows power measurements and calibration of high precision wattmeters and power calibrators at the main power frequencies of 50 and 60 Hz.

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Section: Resultsmentioning

confidence: 98%

Section: Ac Voltage Measurementsmentioning

confidence: 99%

Section: Errors and Uncertaintiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An improvement for dual channel sampling wattmeter

Wijesinghe

Park

2010

Int. J. Metrol. Qual. Eng.

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show abstract

“…They represent about 80 % of the total uncertainty. The key factor to improve the accuracy is to determine rms values not from samples, but with the help of a thermal converter (TC), which allows measuring rms voltages at the 0.1 μV/V level [4]. As displayed in Fig.…”

Section: Recent Improvementsmentioning

confidence: 99%