GB/T 27418-2017Guide to the evaluation and expression of uncertainty in measurement (English PDF)

GB/T 27418-2017 is the English-translated version of 测量不确定度评定和表示.

GB/T 27418-2017 is the Chinese standard "Guide to the evaluation and expression of uncertainty in measurement". Its scope clause reads: This standard stipulates general rules for the evaluation and expression of uncertainty in measurement.

It applies to many fields such as production workshops and basic research.

Measurements of various levels of accuracy, including. a) Quality control and quality assurance using measurement activities in the production process; b) the conformity determination of the measurement results involved in laws and regulations; c) measurement activities in basic research, applied research and development work in science and engineering; d) Calibration of measurement standards and instruments for traceability to national measurement standards; e) Develop and maintain international and national physical measurement standards, including reference materials, and conduct comparisons.

This standard deals mainly with uncertainty representations of measurement results for physical quantities that are well-defined and can be characterized by unique values.

Such as If a phenomenon appears as a distribution of a series of values or depends on one or several parameters, such as time, it is measured to include its distribution.

A set of values for a situation or relationship. This standard also applies to the evaluation and table of relevant uncertainties in the design and theoretical analysis of experiments, measurement methods, complex components and systems.

Show. Because the measurement results and their uncertainty may only be conceptual and may be based entirely on hypothetical data, they are broadly defined in this standard.

To understand the term "measurement result". This standard only provides general rules for the evaluation and presentation of measurement uncertainty, rather than an exhaustive technical specification document.

In addition, this standard Never discuss how the uncertainty of a particular measurement result will be used for different purposes after its assessment, for example. judging one result with another Whether these similar results are compatible; determine the tolerance limits in the manufacturing process; determine whether it is safe to guarantee a certain work process. and so, It may be necessary to develop specific standards based on this standard to solve specific problems or quantify uncertainty in specific measurement areas.

Used for various purposes. Note. In some cases it may be considered that the concept of measurement uncertainty does not fully apply, for example when determining the precision of a test method (eg, Offer [5]). Its clauses include terms and definitions.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 138 pages — is available in the English PDF.

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