D. Avrons

Bureau International des Poids et Mesures, Sèvres, Île-de-France, France

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Publications (6)6.84 Total impact

  • T.J. Witt, D. Reymann, D. Avrons
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    ABSTRACT: We report on a study, carried out from the point of view of users of Josephson array voltage standards, of factors limiting the precision of Zener-diode-based electronic voltage reference standards of the type (Fluke 732A) most widely used for Josephson voltage measurements. Frequency-dependent voltage noise was studied with a very low-frequency spectrum analyzer, and was found to be the major factor limiting short-term stability to about one part in 10<sup>8</sup>. For two of the three reference standards tested, humidity effects were the principal factors limiting the medium- and long-term stability of the 1.018 V outputs. These effects were studied by subjecting the standards to step-function changes in relative humidity. For example, increases in ambient relative humidity of 0.01 were found to provoke decreases of 0.05-0.15 μV in the 1.018 V output of one Zener. The time lag between the humidity change and the voltage change is characterized by a time constant &ges;19 days
    IEEE Transactions on Instrumentation and Measurement 05/1995; · 1.71 Impact Factor
  • D. Reymann, D. Avrons
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    ABSTRACT: To improve measurements of 10-V Zener-based standards, we have designed a new transfer voltage source for use with 10-V Josephson arrays. The transfer voltage is compared, in turn, with that of the Zener standard and that of the array. The use of two separate circuits helps solve the problem of common ground connections and prevents noise from the Zener standard entering the array circuit. This transfer device, which has also been used for 10-V Josephson array comparisons, may be used for other applications
    IEEE Transactions on Instrumentation and Measurement 05/1995; · 1.71 Impact Factor
  • D. Reymann, D. Avrons
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    ABSTRACT: To improve measurements of 10 V Zener based standards, we have designed a new transfer voltage source for use with 10 V Josephson arrays. The transfer voltage is compared, in turn, with that of the Zener standard and of the array. The use of two separate circuits should help to solve the problem of common ground connections and prevent noise from the Zener standard entering the array circuit. This transfer device can also be used for 10 V Josephson array comparisons
    Precision Electromagnetic Measurements, 1994. Digest., 1994 Conference on; 01/1995
  • T.J. Witt, D. Reymann, D. Avrons
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    ABSTRACT: We report on a study of factors limiting the precision of Zener-diode based electronic voltage standards of the type the most widely used at the highest levels of accuracy in national metrology institutes. Frequency-dependent noise is the major factor limiting short-term stability to about one part in 10<sup>8</sup>. Medium- and long-term stability is severely limited by humidity effects; variations of relative humidity of 0.01 can cause changes of 0.1 μV or more in the 1.018 V output
    Precision Electromagnetic Measurements, 1994. Digest., 1994 Conference on; 08/1994
  • T.J. Witt, D. Reymann, D. Avrons
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    ABSTRACT: First Page of the Article
    IEEE Transactions on Instrumentation and Measurement 05/1991; · 1.71 Impact Factor
  • T.J. Witt, D. Reymann, D. Avrons
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    ABSTRACT: The design and performance of six 10-kΩ standard resistors fitted in thermoregulated enclosures are described. A potentiometric resistance comparator was used to compare the six resistors among themselves. The resistance values, known in terms of a quantized Hall resistance standard, were found to drift at constant rates ranging from six to 64 parts in 10<sup>9</sup> per year. The results show that the resistance values can be predicted, over periods of months, to one part in 10<sup>8</sup>
    Precision Electromagnetic Measurements, 1990. CPEM '90 Digest., Conference on; 07/1990