By L. Kirkup, R. B. Frenkel
Dimension shapes clinical theories, characterises advancements in production approaches and promotes effective trade. In live performance with size is uncertainty, and scholars in technology and engineering have to determine and quantify uncertainties within the measurements they make. This e-book introduces size and uncertainty to moment and 3rd yr scholars of technology and engineering. Its technique depends on the the world over acknowledged and prompt guidance for calculating and expressing uncertainty (known via the acronym GUM). The facts underpinning the equipment are thought of and labored examples and workouts are unfold during the textual content. exact case experiences in line with normal undergraduate experiments are incorporated to augment the rules defined within the booklet. This consultant is usually invaluable to execs in who're anticipated to understand the modern equipment during this more and more very important zone. extra on-line assets can be found to help the ebook at www.cambridge.org/9780521605793.
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Additional resources for An introduction to uncertainty in measurement using the GUM
The devices of higher accuracy used 40 Uncertainty in measurement in the calibration are themselves calibrated against devices of yet higher accuracy. In this manner, all devices are traceable to the ‘top of the food chain’ – the international primary standard for the particular quantity. We may call this general class of information ‘speciﬁc information’, since it is speciﬁc to the actual measurand that is of immediate concern. Any discrepancy between this speciﬁc information and the result of the present measurement suggests that there is a systematic error in the present measurement.
A. Hamilton, C. Burroughs and K. Chieh (1990), ‘Operation of NIST Josephson array voltage standards’, Journal of Research of the National Institute of Science and Technology, 95, 219–235. B. Jeckelmann and B. Jeanneret (2001), ‘The quantum Hall effect as an electrical resistance standard’, Reports on Progress in Physics, 64, 1389–1441. I. K. c. Josephson effect emf standard using a superconducting current comparator’, Metrologia, 12, 47–54. 2) T. J. Quinn and J. E. Martin (1985), ‘A radiometric determination of the Stefan–Boltzmann constant and thermodynamic temperatures between −40 ◦ C and +100 ◦ C’, Philosophical Transactions of the Royal Society, 316, 85–181.
1 of chapter 2. Using the deﬁned and uncertainty-free value for the speed of light c, the metre can then be deﬁned as a multiple of the wavelength, λ, inferred from f through the relation λ = c/ f. 4 Calibration In order that an instrument or artefact should accurately indicate the value of a quantity, the instrument or artefact requires calibration. 5). There is no hard-and-fast distinction between ‘instrument’ and ‘artefact’, but in general an instrument measures a quantity, whereas an artefact provides a quantity.