Download The Quality of Measurements: A Metrological Reference by A.E. Fridman (auth.) PDF

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  • April 20, 2017
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By A.E. Fridman (auth.)

This monograph and translation from the Russian describes intimately and reviews at the basics of metrology. the elemental innovations of metrology, the rules of the foreign method of devices SI, the idea of dimension uncertainty, the recent technique of estimation of dimension accuracy at the foundation of the uncertainty notion, in addition to the equipment for processing dimension effects and estimating their uncertainty are mentioned from the fashionable place. it truly is proven that the uncertainty suggestion is suitable with the classical conception of accuracy. the idea of random uncertainties is supplemented with their so much common description at the foundation of generalized basic distribution; the instrumental systematic error are awarded in reference to the technique of normalization of the metrological features of measuring tools.

The information regarding sleek platforms of traceability is given. All mentioned theoretical ideas and calculation equipment are illustrated with examples.

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05 mm for X ¼ 100 mm corresponds to a rather high accuracy of measurement, while for X ¼ 1 mm it would be low. 7). 1 Classification of Measurement Errors 25 Hence, relative measurement error is the ratio of the absolute measurement error to the true value of the measurand or the measurement result. 4) where Xn is the value of the measurand, conventionally taken as the normalized value of the scale range of the measuring instrument. Most commonly, the difference between the upper and lower limits of this scale range is used for the Xn .

A deficiency of this method of expressing these values is the fact that they cannot be used for a comparative estimation of the accuracy of different measurement technologies. 05 mm for X ¼ 100 mm corresponds to a rather high accuracy of measurement, while for X ¼ 1 mm it would be low. 7). 1 Classification of Measurement Errors 25 Hence, relative measurement error is the ratio of the absolute measurement error to the true value of the measurand or the measurement result. 4) where Xn is the value of the measurand, conventionally taken as the normalized value of the scale range of the measuring instrument.

In this case, only the second transducer in the MT3group is an intermediate transducer. This then implies that in analytical instruments, the entire set of MTs plays the role of a primary MT, successively transforming, in several phases, the measured quantity into a measurement signal. 2 Measures Reproduction of a quantity Qm ¼ N½QŠ of specified magnitude is accomplished using a measure of the quantity Q. An MT intended for reproducing and/or storing the physical magnitude of one or more pre-specified magnitudes whose values are known to the requisite accuracy.

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