Precision AC–DC Difference Measurement System Based on a Programmable Josephson Voltage Standard

Budovsky, I.; Georgakopoulos, D.; Hagen, Thomas; Sasaki, Hirokazu; Yamamori, Hirotake

doi:10.1109/tim.2011.2108554

Cited by 18 publications

(11 citation statements)

References 26 publications

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“…The accuracy of the differential sampling method is limited by the stability of the sine-wave voltage source and the performance of the sampling DVM. All these methods [3]- [9], [12]- [18] implement PJVS systems because they can produce voltages up to 10 V [1], [19]- [21]. Pulse-driven Josephson voltage standards produce intrinsically accurate low-harmoniccontent waveforms, but their RMS amplitudes are presently limited to 275 mV [22].…”

Section: Differential Samplingmentioning

confidence: 99%

Differential Sampling Measurement of a 7 V RMS Sine Wave With a Programmable Josephson Voltage Standard

Rüfenacht

Burroughs

Dresselhaus

et al. 2013

IEEE Trans. Instrum. Meas.

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A 10 V programmable Josephson voltage standard has enabled sine waves with voltages up to 7 V RMS to be accurately measured with a differential sampling measurement technique. Expanding the voltage range for this technique enables the direct calibration of the low-frequency ranges of commercial calibrators in the ac voltage mode. This paper reviews the practically achievable performance and challenges of the differential sampling measurement technique that arise when measuring RMS voltages greater than a few volts. A relative Type A uncertainty of 4 parts in 10 7 was achieved with the technique when measuring a 7 V RMS sine wave generated by a calibrator at 62.5 Hz. 1

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Section: Differential Samplingmentioning

confidence: 99%

Differential Sampling Measurement of a 7 V RMS Sine Wave With a Programmable Josephson Voltage Standard

Rüfenacht

Burroughs

Dresselhaus

et al. 2013

IEEE Trans. Instrum. Meas.

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“…A representative example of the invention based on this method is shown in Fig. 9 [20] The advantages of this method are twofold: 1) the uncertainty of the thermal converter can be reduced and 2) the current system to provide AC voltage standards can be utilized.…”

Section: Establishment Of the National Standardmentioning

confidence: 99%

Development of thin-film multi-junction thermal converters

Fujiki¹,

Amagai²,

Sasaki³

2015

Synthesiology English edition

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National metrology institutes and calibration laboratories have established relevant measurement standards, operate and maintain these standards, and provide calibration services.The method that can derive an AC voltage standard with the highest precision is the AC-DC transfer method, [1] in which a thermal AC-DC converter (thermal converter) is used to compare an AC voltage with a DC voltage standard. Therefore, AC-DC transfer standards have been supplied as national AC voltage standards. With respect to the provision of AC-DC transfer standards, the AC-DC transfer differences of a thermal converter are calibrated, which correspond to the conversion error from a DC voltage to an AC voltage. In other words, AC standards are provided to calibration laboratories by calibrating their thermal converters. As explained below, however, the conventional thermal converters are designed in a way to achieve the highest possible precision, which causes inherent structural restrictions to make them hard to be handled owing to the vulnerability to overcurrents and impact. As a result, they have not come into widespread adoption among calibration laboratories or in the industrial community. The majority of calibration laboratories and the industrial community carry out calibrations of AC voltage standards by using standard AC voltmeters and AC generators, and therefore they fail to benefit from the biggest advantage of thermal converters, namely stability. Meanwhile the range of AC voltage standards provided by calibration laboratories to the industrial community in Japan has not been sufficient enough because it is difficult to expand the range of AC voltage standards when AC voltmeters or AC generators are used as reference.

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“…Meanwhile, numerous studies of ac voltage standards based on quantum effects have been intensively conducted recently [10]- [15]. Among these, a method of using a thermal converter in combination with an ac Josephson voltage standard has been proposed to achieve the highest attainable accuracy [14], [15]. It is highly possible that thermal converters will continue to be used to extend the voltage and frequency range of ac voltage standards even if quantum-based ac standards are realized.…”

Section: Fabrication Of Thin Film Multijunction Thermal Converters Wimentioning

confidence: 99%

Fabrication of Thin Film Multijunction Thermal Converters With Improved Long-Term Stability

Fujiki

Amagai

Shimizume³

et al. 2015

IEEE Trans. Instrum. Meas.

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To increase the long-term stability of thin-film multijunction thermal converters (TFMJTCs) developed by the National Metrology Institute of Japan and Nikkohm Corporation Ltd., we prevented their degradation by improving the design and fabrication process. Judging from the Arrhenius model experiments, we successfully increased the lifetime of a renewed TFMJTC to more than 20 years by improving the deposition pattern of a Bi-Sb-Cu-based thin-film thermopile. We also evaluated the thermoelectric effect of the renewed TFMJTCs by the fast-reversed dc method. The low thermoelectric effect of less than 0.1 µV/V has been realized, which is comparable with that of high-quality multijunction thermal converters previously produced by other national metrology institutes.Index Terms-AC voltage standard, ac-dc transfer difference, long-term stability, thermal converter, thermocouple, thin film.

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Precision AC–DC Difference Measurement System Based on a Programmable Josephson Voltage Standard

Cited by 18 publications

References 26 publications

Differential Sampling Measurement of a 7 V RMS Sine Wave With a Programmable Josephson Voltage Standard

Differential Sampling Measurement of a 7 V RMS Sine Wave With a Programmable Josephson Voltage Standard

Development of thin-film multi-junction thermal converters

Fabrication of Thin Film Multijunction Thermal Converters With Improved Long-Term Stability

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