AC-DC difference measurements relative to Josephson generated voltages

Palafox, L.; Behr, R.; Funck, T.

doi:10.1109/cpem.2010.5543958

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…As in the test the amplitude is measured twice with the sampling technique, directly and differentially, it is not an independent proof of the sampling procedure. In order to validate the AC-QVM with a lower uncertainty, we can determine the amplitude of the calibrator with an ac-dc difference measurement [13,21,[30][31][32] in parallel to the AC-QVM.…”

Section: Thermal Converter Verificationmentioning

confidence: 99%

An ac quantum voltmeter based on a 10 V programmable Josephson array

Lee¹,

Behr²,

Palafox³

et al. 2013

Metrologia

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An ac quantum voltmeter based on a 10 V programmable Josephson array that is simple to use, provides dc and ac calibration up to kHz range for equipment widely used in metrology, and ensures direct traceability to a quantum-based standard, is developed. This ac quantum voltmeter is proven to match conventional Josephson standard systems at dc and extends its advantages up to 10 kHz in the low-frequency ac range. The ac quantum voltmeter is capable of performing calibrations up to 7 V RMS in the frequency range from dc to 10 kHz completely under software control. A direct comparison at dc has demonstrated an uncertainty better than 2 parts in 10 10 (k = 2). The uncertainty at 1 kHz is better than 1.7 µV V −1 (k = 2) for a measurement time of 1 min. The ac quantum voltmeter is a robust and practical system that fulfils the needs of general metrology laboratories for quantum-based voltage calibrations.

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Section: Thermal Converter Verificationmentioning

confidence: 99%

An ac quantum voltmeter based on a 10 V programmable Josephson array

Lee¹,

Behr²,

Palafox³

et al. 2013

Metrologia

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show abstract

“…Ideally, the transitions between quantum voltages from the two systems should /would arrive at the PMJTC simultaneously. The synchronization electronics used are also described in [7]. We have measured the transients of the synthesized stepwise-approximated sine wave at the input of the PMJTC to verify that both waveforms are well synchronized.…”

Section: The Double Josephson Waveform Synthesizermentioning

confidence: 99%

Double Josephson waveform synthesizer for high precision ac-dc transfer measurement

et al. 2010

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“…To address these technical issues, a variety of measurement techniques have been developed to evaluate the AC-DC difference of a TVC [15][16][17][18][19]. These techniques are divided into two broad categories: differential sampling techniques, which use a semiconductor AC/DC source [20,21], and techniques involving the direct application of stepwise-approximated waveforms via a precision amplifier [22,23]. Differential sampling techniques are particularly useful because they eliminate the errors caused by the finite transitions between quantized voltage steps.…”

Section: Introductionmentioning

confidence: 99%

Extending voltage range to 10 V rms in AC–DC difference measurements with AC programmable Josephson voltage standard

Amagai

Maruyama

Yamamori

et al. 2020

Meas. Sci. Technol.

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The larger-scale programmable Josephson voltage standard (PJVS) chip composed of 524 288 niobium nitride-based overdamped Josephson junctions enables us to generate stepwise-approximated AC waveforms with a root-mean-square (rms) amplitude of up to 10 V. In this study, we have extended the voltage range of the differential sampling system based on the AC-PJVS to an rms value of 10 V with the larger-scale PJVS chip. The sampling digital voltmeter (DVM) that is employed to measure differential voltages is modified to use a 10 MHz reference clock instead of an internal clock. This modification substantially improves the uncertainty of AC-DC difference measurements at low frequencies, which is caused by the internal clock error of the sampling DVM, by preventing the incoherent sampling of the differential voltages. The expanded uncertainties (k = 2) of the AC-DC difference measurements are reduced from 7.0 µV/V to 1.8 µV/V for a frequency of 62.5 Hz and from 8.0 µV/V to 4.4 µV/V for a frequency of 1 Hz. The improvements in the uncertainty are more significant compared with a conventional method at low frequencies, where the accuracy of a thermal voltage converter is reduced.

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AC-DC difference measurements relative to Josephson generated voltages

Cited by 6 publications

References 12 publications

An ac quantum voltmeter based on a 10 V programmable Josephson array

An ac quantum voltmeter based on a 10 V programmable Josephson array

Double Josephson waveform synthesizer for high precision ac-dc transfer measurement

Extending voltage range to 10 V rms in AC–DC difference measurements with AC programmable Josephson voltage standard

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