Comparison of quantum Hall effect resistance standards of the PTB and the BIPM

Delahaye, F.; Witt, Thomas J.; Pesel, Eckart; Schumacher, B.; Warnecke, P.

doi:10.1088/0026-1394/34/3/2

Cited by 23 publications

(15 citation statements)

References 10 publications

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“…This is consistent with the results of previous comparisons, e.g. [8], where it was necessary to increase the delay time of one CCC bridge in order to get acceptable agreement on the 1 Ω:100 Ω ratio. Such problems are unusually attributed to the effect of Peltier heating in four terminal resistors, where a voltage that reverses with the applied current can be created at the potential terminals (see section 2.1.3 of [1]).…”

Section: Initial Findings During An On-site Comparisonsupporting

confidence: 92%

“…Previous results of the same onsite comparison series have demonstrated agreement for 1 Ω:100 Ω measurements at the nΩ/Ω level. Only in [8] have difficulties with cycle time been reported, but we believe this is because in all other cases, the CCC bridges used were of similar design to the BIPM bridge with similarly slow cycle times. This is less likely to be the case for modern bridges.…”

Section: Impact On Resistance Metrologymentioning

confidence: 97%

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The buffer property in resonance systems of non-linear hyperbolic equations

Kolesov¹,

Mishchenko²,

Розов³

2000

Russ. Math. Surv.

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This paper presents a systematic study of the effects of reversals of current polarity on 1 Ω standard resistors. A selection of 1 Ω standards were measured on a dc cryogenic current comparator bridge and also on an ac current comparator bridge operating at 1 Hz. We find that the apparent 4 terminal resistance depends strongly on the dc reversal rate, in one case showing a variation of more than 0.1 μΩ/Ω for cycle times between 10 s and 1000 s. Even in the best cases, effects of at least 0.01 μΩ/Ω are present. Furthermore, the assumption that the apparent resistance value converges to a limiting value for long waiting times after reversal is not always upheld, making it difficult to quote a simple dc value. Existing models of Peltier heating at wire junctions do not completely explain our observations. The problems presented have been the limiting factor for 1 Ω measurements as part of a recent on-site comparison of quantum Hall effect resistance standards.

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Section: Initial Findings During An On-site Comparisonsupporting

confidence: 92%

Section: Impact On Resistance Metrologymentioning

confidence: 97%

The buffer property in resonance systems of non-linear hyperbolic equations

Kolesov¹,

Mishchenko²,

Розов³

2000

Russ. Math. Surv.

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“…The standard uncertainty realized in such comparisons is limited by the stability of the traveling standards to standard uncertainties of no better than 0.01 μ / . To reach beyond this limit, it has been necessary to utilize a traveling quantum Hall resistance (QHR) standard, which allows verification of measurement equivalency of standard uncertainty down to an ultimate level of 0.001 μ / [2]. Due to the difficulty in handling of the traveling QHR, it is meaningful to investigate ways of improving comparisons based on standard resistors with the goal of reaching a standard uncertainty of around 0.01 μ / or less.…”

Section: Introductionmentioning

confidence: 99%

Transportation Effect and Basic Characteristics of Metal-Foil Resistors Examined in an International Trilateral Pilot Study

Kaneko

Kim

et al. 2015

IEEE Trans. Instrum. Meas.

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The transportation effect and other important characteristics of 100 standard resistors of a new construction have been studied. For the transportation effect, four resistors have been transported by air between three national metrology institutes (NMIs): 1) the Korea Research Institute of Standards and Science; 2) the National Institute of Standards and Technology in the USA; and 3) the National Metrology Institute of Japan. Two of the resistors have been transported in hand-carried luggage and the other two by normal air freight. Resistance values as well as other characteristics have been carefully evaluated before and after the transportation to the NMIs. The measurements were done by means of their primary national standards based on the quantum Hall effect. No noticeable difference between the two transportation methods has been detected within a standard uncertainty of 0.01 μ / . Other characteristics, the drift rate: about 0.05 (μ / )/year or less, temperature coefficient: about 0.02 (μ / )/°C or less, and power coefficient: negligible, have also been reported. It is demonstrated that this excellent performance is suitable for utilization in NMIs and international comparisons.Index Terms-International comparison, quantum Hall effect, resistance standard, standard resistor, transportation effect.

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“…Under some experimental conditions and following specific technical guidelines [51], the independence of R K on QHE device characteristics (type, materials, channel width, contacts), the number i and experimental parameters (temperature, measuring current, magnetic field) has been demonstrated at levels down to a few parts in 10 10 [52,53]. Moreover, on-site bilateral comparisons of complete QHE systems carried out between the Bureau International des Poids et Mesures (BIPM) and some NMIs during the past decades [54][55][56][57][58] or more recent comparisons via 1 X or 100 X travelling standards have shown excellent agreement of a few parts in 10 9 [59,60]. These results, which have to be ascribed to the use of CCC bridges in such comparisons, strongly support the universality of R K 8) .…”

Section: Introductorymentioning

confidence: 99%