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GB/T 18779.2-2023Geometrical product specifications (GPS) - Inspection by measurement of workpieces and measuring equipment - Part 2: Guidance for the estimation of uncertainty in GPS measurement, in calibration of measuring equipment and in product verification (English PDF)

产品几何技术规范(GPS) 工件与测量设备的测量检验第2部分：GPS测量、测量设备校准和产品验证中的测量不确定度评估指南

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

March 17, 2023

Implementation date

October 1, 2023

Scope

GB/T 18779.2-2023 is the English-translated version of 产品几何技术规范(GPS) 工件与测量设备的测量检验第2部分：GPS测量、测量设备校准和产品验证中的测量不确定度评估指南.

GB/T 18779.2-2023 is the Chinese standard "Geometrical product specifications (GPS) - Inspection by measurement of workpieces and measuring equipment - Part 2: Guidance for the estimation of uncertainty in GPS measurement, in calibration of measuring equipment and in product verification".

Its scope clause reads: The "Guidelines for the Expression of Uncertainty in Measurement" (hereinafter referred to as GUM) concept implementation guidelines proposed in this document are applicable to the industry's understanding of the GPS field.

Calibration of measuring standards and measuring equipment within the domain and measurement of GPS characteristics of workpieces.

Its purpose is to provide the information needed to complete an uncertainty report All information, and provide a basis for comparison of measured results and their uncertainties (the relationship between customers and suppliers).

The purpose of this document is to support ISO 14253-1.This document, along with ISO 14253-1, benefits all technical functions within a company Interpretation of GPS specifications (i.e. tolerances on workpiece properties and maximum permissible errors (MPEs) on metrological properties of measuring equipment).

Based on GUM, a practical iterative procedure for evaluating measurement uncertainty without changing the basic concepts of GUM.

Usually in the following situation Conditions are used to evaluate measurement uncertainty and provide an uncertainty statement. ---Single measurement result; ---Comparison of two or more measured results; ---Compare the measured results obtained by one (or more) workpieces or one (or more) measuring equipment with the given specification (that is, the measuring instrument Or the maximum allowable errors (MPEs) of metrological characteristics of measurement standards, or the tolerance limits of workpiece characteristics, etc.) for comparison, and verify according to specifications Eligibility.

The iterative method is generally based on the upper limit assessment strategy, that is, overestimating the uncertainty at each stage of uncertainty assessment, iteratively The number of generations controls the amount of overestimation.

To prevent erroneous judgments based on measured results, conscious overestimation rather than underestimation is necessary. high The estimated amount is also limited by the economic evaluation of the measurement project.

The iterative method is a method to maximize benefits and minimize costs in the company's measurement activities. The iterative method is both an economic A method of self-adjustment is also a method of changing or reducing the existing uncertainty in measurement in order to reduce costs in measurement (manufacturing).

Law. Iterative methods enable coordination between risk, effort and cost in uncertainty assessment and uncertainty estimation. Its clauses include normative reference documents.

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Document preview — GB/T 18779.2-2023

National Standard of the People's Republic of China

ICS: 17.040.40
Classification: J 42
Replacing: GB/T 18779.2-2004

Issued by: State Administration for Market Regulation, China National Standardization Administration

Preface
Introduction
1 Scope
2 Normative reference documents
3 Terms and Definitions
4 symbols
5 Iterative GUM method for measurement uncertainty assessment
6 Uncertainty Management Procedure---PUMA
6.1 Overview
6.2 Uncertainty management of a given measurement process
6.3 Uncertainty management in the design and development of measurement processes or measurement procedures
7 Sources of errors and measurement uncertainty
7.1 Types of errors
7.2 Measurement environment
7.3 Reference elements for measuring equipment
7.4 Other elements of measuring equipment
7.5 Measurement configuration (excluding workpiece placement and clamping)
7.6 Software and Computing
7.7 Surveyor
7.8 Characteristics of the measurement object, workpiece or measuring instrument
7.9 Definition of GPS characteristics, workpiece or measuring instrument characteristics
7.10 Measurement procedure
7.11 Physical constants and conversion factors
8 Methods for evaluating uncertainty components, combined standard uncertainty and expanded uncertainty
8.1 Evaluation of uncertainty components
8.2 Type A evaluation of uncertainty components
8.3 Type B evaluation of uncertainty components
8.4 Common examples of Type A and Type B assessments
8.5 Black box model and transparent box model for uncertainty assessment
8.6 Black box method of uncertainty evaluation---synthetic standard uncertainty of uncertainty components uc
8.7 Transparent box method of uncertainty evaluation---synthetic standard uncertainty of uncertainty components uc
8.8 Evaluation of the expanded uncertainty U of the combined standard uncertainty uc
8.9 The nature of the measurement uncertainty parameters uc and U
9 Actual assessment of uncertainty---uncertainty estimate based on PUMA
9.1 Overview
9.2 Prerequisites for uncertainty estimation
9.3 Standard procedure for estimating uncertainty
10 Applications
10.1 Overview
10.2 Recording and evaluation of uncertainty values
10.3 Design and documentation of measurement or calibration procedures
10.4 Design, Optimization and Documentation of Calibration Level Sequences
10.5 Design and documentation of new measuring equipment
10.6 Environmental requirements and their determination
10.7 Surveyor requirements and qualifications
Appendix A (Informative) Example of Uncertainty Estimate---Calibration of Ring Gauge
Appendix B (Informative) Example of Uncertainty Estimate---Calibration Level Sequence Design
Appendix C (informative) Example of uncertainty estimate---roundness measurement
Appendix D (informative) Relationship with GPS matrix model

1 Scope

The "Guidelines for the Expression of Uncertainty in Measurement" (hereinafter referred to as GUM) concept implementation guidelines proposed in this document are applicable to the industry's understanding of the GPS field.

Calibration of measuring standards and measuring equipment within the domain and measurement of GPS characteristics of workpieces. Its purpose is to provide the information needed to complete an uncertainty report

All information, and provide a basis for comparison of measured results and their uncertainties (the relationship between customers and suppliers).

The purpose of this document is to support ISO 14253-1.This document, along with ISO 14253-1, benefits all technical functions within a company

Interpretation of GPS specifications (i.e. tolerances on workpiece properties and maximum permissible errors (MPEs) on metrological properties of measuring equipment).

Based on GUM, a practical iterative procedure for evaluating measurement uncertainty without changing the basic concepts of GUM. Usually in the following situation

Conditions are used to evaluate measurement uncertainty and provide an uncertainty statement.

---Single measurement result;

---Comparison of two or more measured results;

---Compare the measured results obtained by one (or more) workpieces or one (or more) measuring equipment with the given specification (that is, the measuring instrument

Or the maximum allowable errors (MPEs) of metrological characteristics of measurement standards, or the tolerance limits of workpiece characteristics, etc.) for comparison, and verify according to specifications

Eligibility.

The iterative method is generally based on the upper limit assessment strategy, that is, overestimating the uncertainty at each stage of uncertainty assessment, iteratively

The number of generations controls the amount of overestimation. To prevent erroneous judgments based on measured results, conscious overestimation rather than underestimation is necessary. high

The estimated amount is also limited by the economic evaluation of the measurement project.

The iterative method is a method to maximize benefits and minimize costs in the company's measurement activities. The iterative method is both an economic

A method of self-adjustment is also a method of changing or reducing the existing uncertainty in measurement in order to reduce costs in measurement (manufacturing).

Law. Iterative methods enable coordination between risk, effort and cost in uncertainty assessment and uncertainty estimation.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations

For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

ISO 14253-1 Geometric Product Specification (GPS) Measurement inspection of workpieces and measuring equipment Part 1.Verification of compliance with specifications

Note. GB/T 18779.1-2022 Product Geometric Specification (GPS) Measurement Inspection of Workpieces and Measuring Equipment Part 1.Verification according to specifications or

Unqualified determination rules (ISO 14253-1.2017, IDT)

ISO 17450-1 Geometric Product Specification (GPS) General concepts Part 1.Models for geometric specification and inspection [Geome-

GB/T 10932 | GB/T 22092 | GB/T 26093 | GB/T 18779.3 | GB/T 18779.1 | GB/T 18779.5 | […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 57 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 18779.1-2022Geometrical product specifications (GPS) - Inspection by measurement of workpieces and measuring equipment - Part 1: Decision rules for verifying conformity or nonconformity with specifications

ISO 14253-1 · ISO 17450-1

Cited by

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