Read e-book online An Introduction to Uncertainty in Measurement: Using the GUM PDF

By L. Kirkup, R. B. Frenkel

ISBN-10: 0521844282

ISBN-13: 9780521844284

Dimension shapes medical theories, characterises advancements in production strategies and promotes effective trade. In live performance with size is uncertainty, and scholars in technological know-how and engineering have to establish and quantify uncertainties within the measurements they make. This publication introduces dimension and uncertainty to moment and 3rd 12 months scholars of technology and engineering. Its procedure depends upon the the world over recognized and suggested directions for calculating and expressing uncertainty (known via the acronym GUM). The records underpinning the tools are thought of and labored examples and workouts are unfold during the textual content. distinct case reviews in response to commonplace undergraduate experiments are integrated to augment the rules defined within the publication. This consultant can also be invaluable to execs in who're anticipated to understand the modern tools during this more and more very important region. extra on-line assets can be found to help the e-book at www.cambridge.org/9780521605793.

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So we expect an error when we measure the measurand in an imperfect but more practically realisable manner. Next we recognise that errors come in two flavours: ‘random’ and ‘systematic’. 2 Random errors The distinction between random and systematic errors is best seen by considering the notion of ‘repeating the measurement under unchanging conditions’, or as closely as we can arrange such conditions. By ‘unchanging conditions’ we mean a well-defined measurand, a tightly controlled environment and the same measuring instrument.

4 For more detail and discussion, see Australian Standard AS2706-2003, ‘Numerical values – rounding and interpretation of limiting values’ (Sydney, Standards Australia, 2nd edn, 2003). 3 Rounding and significant figures 23 When measurements are made, how many figures should be reported? Modern instruments are capable of displaying values to many figures. c. 999 99 V. While it is often prudent to record all the figures supplied by an instrument, in many cases the particular quantity being measured may vary to such an extent as to make some of the figures almost meaningless.

Making many measurements is in fact generally preferable to making only a few – time and resources permitting. 1; the greater the number of measurements, the more precisely we might expect to establish the value of the temperature coefficient. However, it is often pointless to take very many measurements to ascertain the true value of the measurand. The reason is the probable existence of the other flavour of error: a systematic error. 3 Systematic errors During any measurement, there will probably be an error that remains constant when the measurement is repeated under the same conditions.

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An Introduction to Uncertainty in Measurement: Using the GUM by L. Kirkup, R. B. Frenkel


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