BS ISO 21748:2017给出了使用根据本标准进行的研究获得的数据对测量不确定性进行评估的指南 使用ISO 5725-2，并将合作研究结果与使用 不确定性传播的形式原则（见第14条）。ISO 5725-3为中等精度的研究提供了额外的模型。然而，尽管如此 一般方法可应用于此类扩展模型的使用，不确定性评估使用 这些模型不包含在本文件中。本文件适用于所有测量和测试领域，其中不确定度与 结果有待确定。本文件不描述在缺乏数据的情况下重复性数据的应用 再现性数据。本文件假设通过以下方式纠正公认的、不可忽略的系统影响: 将数值校正作为测量方法的一部分，或通过调查和删除 结果的原因。本文件中的建议主要用于指导。人们认识到 提出的建议确实构成了评估许多人不确定性的有效方法 此外，还可以采用其他合适的方法。 一般来说，本文件中对测量结果、方法和过程的引用通常是 理解为也适用于测试结果、方法和过程。交叉引用:ISO指南33:2000ISO 10576-1:2003 Ed 1ISO 5725-5:1998ISO 11648-2:2001 Ed 1ISO/IEC 17043:2010 Ed 1ISO 3534-3:2013 Ed 3ISO 3534-2:2006 Ed 2（R10）ISO/IEC 17025:2005 Ed 1ISO 5725-3:1994ISO 7870-2:2013ISO 3534-1:2006 Ed 2（R10）ISO/IEC指南99:2007ISO 5725-1:1994ISO/IEC指南98-3:2008 Ed 1ISO 7870-4:2011ISO 5725-2005修订版购买本文件时提供的信息包括在内。

BS ISO 21748:2017 gives guidance forevaluation of measurement uncertainties using data obtained from studies conducted in accordance with ISO 5725-2, andcomparison of collaborative study results with measurement uncertainty (MU) obtained using formal principles of uncertainty propagation (see Clause 14).ISO 5725-3 provides additional models for studies of intermediate precision. However, while the same general approach may be applied to the use of such extended models, uncertainty evaluation using these models is not incorporated in this document.This document is applicable to all measurement and test fields where an uncertainty associated with a result has to be determined.This document does not describe the application of repeatability data in the absence of reproducibility data.This document assumes that recognized, non-negligible systematic effects are corrected, either by applying a numerical correction as part of the method of measurement, or by investigation and removal of the cause of the effect.The recommendations in this document are primarily for guidance. It is recognized that while the recommendations presented do form a valid approach to the evaluation of uncertainty for many purposes, it is also possible to adopt other suitable approaches.In general, references to measurement results, methods and processes in this document are normally understood to apply also to testing results, methods and processes.Cross References:ISO GUIDE 33:2000ISO 10576-1:2003 Ed 1ISO 5725-5:1998ISO 11648-2:2001 Ed 1ISO/IEC 17043:2010 Ed 1ISO 3534-3:2013 ED3ISO 3534-2:2006 Ed 2 (R10)ISO/IEC 17025:2005 Ed 1ISO 5725-3:1994ISO 7870-2:2013ISO 3534-1:2006 Ed 2 (R10)ISO/IEC Guide 99:2007ISO 5725-1:1994ISO 5725-6:1994ISO/IEC GUIDE 98-3:2008 Ed 1ISO 7870-4:2011ISO 5725-4:1994ISO/TR 22971:2005 Ed 1All current amendments available at time of purchase are included with the purchase of this document.