2004 Conference on Precision Electromagnetic Measurements 2004
DOI: 10.1109/cpem.2004.305620
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Evaluation of the Frequency Dependence of the Resistance and Capacitance Standards in the BIPM Quadrature Bridge

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Cited by 3 publications
(4 citation statements)
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“…The main difficulties arose from the fairly resistive cryogenic coaxial cables needed for connecting the QHE sample to the impedance bridge. The adoption of multiple connections technique [43] and the use of active current equalizers [50] in place of passive connectors have been found well suited to reducing the best measurement uncertainties. As a consequence, some controversial results about the frequency effect on QHR have been partly explained.…”
Section: Ac Qhr Standardmentioning
confidence: 99%
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“…The main difficulties arose from the fairly resistive cryogenic coaxial cables needed for connecting the QHE sample to the impedance bridge. The adoption of multiple connections technique [43] and the use of active current equalizers [50] in place of passive connectors have been found well suited to reducing the best measurement uncertainties. As a consequence, some controversial results about the frequency effect on QHR have been partly explained.…”
Section: Ac Qhr Standardmentioning
confidence: 99%
“…However, the linear dependence of QHR on frequency and current usually measured, which would be correlated to an ac loss mechanism in the QHE device, remains unclear. Indeed, one can reduce this linear variation by different methods either by the use of gated samples or of specific sample holders [49][50][51]. The frequency coefficient on QHR has thus been obtained within a few parts in 10 8 per kilohertz.…”
Section: Ac Qhr Standardmentioning
confidence: 99%
“…Nowadays, 100 pF capacitance standards can be calibrated in terms of R K with a relative uncertainty of only a few parts in 10 8 [ 8 ], [ 11 ]. Although a few versions of transformer-based quadrature bridges have been designed to be operated at multiple frequencies [ 9 ], [ 53 ], [ 54 ], most of them only work at a single frequency: 1233 Hz for comparison of 10 nF to 12.906 kΩ and 1592 Hz for comparison of 10 nF to 10 kΩ.…”
Section: Validationmentioning
confidence: 99%
“…Reference values of the capacitance standards are primarily determined in terms of the quantized Hall resistances using a quadrature bridge through some consecutive measurements [1][2][3][4][5][6]. They are carried out for different capacitance standards at different frequencies [7][8][9][10][11][12][13]. Accurate dissemination of the capacitance unit in a wide range of the measurement is a very important issue in the calibration laboratories.…”
Section: Introductionmentioning
confidence: 99%