GB/T 27430-2022 Active National standards

GB/T 27430-2022 Role of measurement uncertainty in conformity assessment

Publish Date: 2022-12-30 Implement Date: 2022-12-30 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 27430-2022

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Measurement

ICS Name: Integrated Metrology and Measurement

Publish Date: 2022-12-30

Implement Date: 2022-12-30

Pages: 47 pages

Scope

This document provides guidelines and procedures for evaluating the conformity of an item (entity, object, or system) with regulatory requirements. The item may be, for example, a gauge block, a scale used in food stores, or a blood sample. The following procedures can be applied in the following cases: a) The item being tested is distinguished by a single measurable attribute (see 3.2.1), and the detailed procedure for defining this attribute is sufficient to represent it with a unique true value. Note: GB/T 27418-2017 provides reasons for not using the term "true", but this document will still use this term to avoid potential ambiguity or confusion. b) The allowable range of values for this attribute is defined by one or two tolerance limits. c) The attribute can be measured, and the measurement results (see 3.2.5) are expressed in the manner specified in GB/T 27418-2017, so that knowledge of the attribute's value can be obtained through: 1) a probability density function (PDF, see 3.1.3); 2) a distribution function (see 3.1.2); 3) numerical approximations of these functions; 4) reasonable descriptions such as inclusion intervals and corresponding inclusion probabilities. The procedures proposed in this document apply to generating an interval of allowable measured values for the attribute of concern, referred to as the acceptance interval. Acceptance limits can be reasonably selected to effectively balance the risk of accepting non-conforming items (consumer risk) or rejecting conforming items (producer risk). This document addresses two conformity assessment issues. The first is setting acceptance limits to ensure that the expected conformity probability of a single item being tested is achieved. The second is setting acceptance limits to ensure that the average confidence level of multiple items (nominally identical) being measured meets an acceptable level. This document provides guidance for solving the above-mentioned issues.