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Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 34874.4-2025: Geometrical product specifications (GPS) - X-ray three dimensional size measuring machines - Part 4: Evaluation of uncertainty in measurement Status: Valid
Basic dataStandard ID: GB/T 34874.4-2025 (GB/T34874.4-2025)Description (Translated English): Geometrical product specifications (GPS) - X-ray three dimensional size measuring machines - Part 4: Evaluation of uncertainty in measurement Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J04 Classification of International Standard: 17.040.30 Word Count Estimation: 22,243 Date of Issue: 2025-03-28 Date of Implementation: 2025-03-28 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 34874.4-2025: Geometrical product specifications (GPS) - X-ray three dimensional size measuring machines - Part 4: Evaluation of uncertainty in measurement---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. GB/T 34874.4-2025 English version. Geometrical product specifications (GPS) - X-ray three dimensional size measuring machines - Part 4.Evaluation of uncertainty in measurement ICS 17.040.30 CCSJ04 National Standard of the People's Republic of China Product Geometric Specification (GPS) X-ray 3D dimension measuring machine Part 4.Evaluation of measurement uncertainty machines-Part 4.Evaluationofuncertaintyinmeasurement Released on 2025-03-28 2025-03-28 Implementation State Administration for Market Regulation The National Standardization Administration issued Table of ContentsPreface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Measurement Task 1 4.1 Scope of measurement tasks 1 4.2 Objectives of the measurement task and its uncertainty 2 5 Measurement process 2 5.1 Measurement principle 2 5.2 Measurement method 2 5.3 Measurement Program Operation Set 3 5.4 Measurement conditions 3 6 Evaluation of measurement uncertainty 3 6.1 Uncertainty Assessment --- GUM Method 3 6.2 Uncertainty Assessment --- Monte Carlo Method (MCM) 5 7 Uncertainty management of measurement procedures 7 Appendix A (Informative) Example of Measurement Uncertainty Evaluation (GUM Method) 8 A.1 Overview 8 A.2 Task and goal uncertainty 8 A.3 Principles, methods, procedures and conditions 8 A.4 Measurement Model 8 A.5 Sources and explanations of measurement uncertainty 9 A.6 Comments 10 Appendix B (Informative) Measurement Uncertainty Evaluation Example (MCM) 11 B.1 Overview 11 B.2 Task and goal uncertainty 11 B.3 Principles, methods, procedures and conditions 11 B.4 Measurement Model 11 B.5 Description of the probability distribution of each input quantity 12 B.6 Reporting Results13 B.7 Comments 13 Appendix C (Informative) Application of uncertainty assessment results 14 Appendix D (Informative) Relationship with GPS Matrix Model 15 D.1 Overview 15 D.2 Information about the standard and its use 15 D.3 Position in the GPS matrix model 15 D.4 Related standards 15 References 16ForewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document is Part 4 of GB/T 34874 "Technical Specification for Product Geometry (GPS) X-ray Three-Dimensional Dimension Measuring Machine". GB/T 34874 has published the following parts. --- Part 1.Vocabulary; --- Part 3.Acceptance testing and retesting; --- Part 4.Evaluation of measurement uncertainty; --- Part 6.Detection methods for workpieces. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document is proposed and coordinated by the National Technical Committee for Standardization of Product Geometry Technical Specifications (SAC/TC240). This document was drafted by. Shenzhen China Institute of Metrology Technology Innovation Research Institute, China Machinery Research Institute of Standards and Technology (Beijing) Co., Ltd. China Metrology Institute, China University of Metrology, Guangdong Metrology Institute, Beijing Aerospace Metrology and Testing Technology Institute, Shenzhen Zhuomao Technology Co., Ltd., Guangzhou Metrology and Testing Technology Research Institute, Guangzhou Energy Testing Research Institute, Nanjing Metrology Supervision and Testing Institute, Anhui Chuangpu Instrument Technology Co., Ltd., Aoying Testing Technology (Shanghai) Co., Ltd., Suzhou Metrology and Testing Institute, Beijing University of Aeronautics and Astronautics Ningbo Innovation Research Institute Research Institute, Tianjin Sanying Precision Instrument Co., Ltd., and Shandong Institute of Metrology. The main drafters of this document are. Shi Yushu, Zhu Yue, Hu Jiacheng, Song Zhenfei, Zhang Xinyu, Song Jincheng, Wang Eyu, Yan Jiewen, Wang Junxiong, Hu Liangyong, Zhang Guoke, Pi Lei, Guo Xin, Wang Yunxiang, Zhang Yong, Zhang Shu, Li Chaoyang, Shen Jin, Zhao Liang, Fu Jian, Zhang Changsheng, Lu Can, Li Junjiang, Cao Cong, Yang Shidi and Shi Zhoumiao.IntroductionX-ray 3D dimension measuring machine is a kind of geometric measurement equipment with common application and leading technology. As an integral part of the measurement results, the accuracy of the measurement results has a significant impact. The measurement uncertainty evaluation method of X-ray three-dimensional dimension measuring machine is developed to ensure the accuracy of the measurement results. The formulation of this document will also help to further improve the standard system of X-ray 3D dimension measuring machines and fill the gap in my country's X-ray 3D dimension measuring machines. It can not only promote the application of X-ray 3D dimension measuring machines by various manufacturers, but also fill the gap in the application standards of dimension measuring machines. Unification improves the performance consistency and stability of factory equipment, and provides a solid technical foundation for the wide application of X-ray 3D dimension measuring machines. Technical support and guarantee. For the convenience of readers, GB/T 34874 is divided into 6 parts. The contents of these parts are interrelated and independent, and together constitute The application method of X-ray three-dimensional dimension measuring system is specified, and the relevant contents of X-ray three-dimensional dimension measuring machine are specified in detail. GB/T 34874 is intended to consist of 6 parts. --- Part 1.Vocabulary. Aims to define the terms used in X-ray three-dimensional dimension measuring machines. --- Part 2.General technical requirements and applications. Aims to specify the basic operating requirements and applications of X-ray three-dimensional dimension measuring machines scene. --- Part 3.Acceptance test and retest. Aims to specify the inspection criteria and retest execution methods of equipment. --- Part 4.Evaluation of measurement uncertainty. Aims to provide a method for evaluating the measurement uncertainty of X-ray three-dimensional dimension measuring machines. --- Part 5.Extraction and fitting of feature elements. Aims to specify the feature extraction and data fitting methods in image processing. --- Part 6.Workpiece detection method. Aims to specify the specific operation method of the equipment in workpiece measurement. Product Geometric Specification (GPS) X-ray 3D dimension measuring machine Part 4.Evaluation of measurement uncertainty1 ScopeThis document describes a method for evaluating the measurement uncertainty of X-ray 3D dimension measuring machines. This document is applicable to the measurement uncertainty assessment of X-ray three-dimensional dimension measuring machines.2 Normative referencesThe contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 18779.2 Product geometry specification (GPS) Measurement and inspection of workpieces and measuring equipment Part 2.GPS measurement, Guide to the evaluation of measurement uncertainty in measurement equipment calibration and product verification GB/T 27418 Evaluation and expression of measurement uncertainty GB/T 27419 Evaluation and Expression of Uncertainty in Measurement Supplementary Document 1.Distribution Propagation Based on Monte Carlo Method GB/T 34874.1 Product geometry specification (GPS) X-ray three-dimensional dimension measuring machine Part 1.Vocabulary JJF1001 General metrological terms and definitions3 Terms and definitionsThe terms and definitions defined in GB/T 18779.2, GB/T 27418, GB/T 27419, GB/T 34874.1 and JJF1001 apply to this document.4 Measurement tasks4.1 Scope of measurement tasks As a non-destructive testing technology equipment, X-ray 3D dimension measuring machine has a wide range of measurement tasks, including but not limited to the following aspects. ---Internal structure measurement. It can penetrate the object being tested and has high spatial resolution to obtain its internal structure, shape and size. And other information, suitable for the detection of various complex structures; ---External structure measurement. With high spatial resolution, it can obtain information such as the external structure, shape and size of the object being tested. For the detection of various complex structures; ---Three-dimensional data reconstruction. Through CT, DR, 3D and other imaging methods, it is possible to achieve three-dimensional reconstruction of the object being measured, providing a more direct More comprehensive test results. Although X-ray 3D dimension measuring machines have powerful measuring capabilities, their measuring range is also limited by the instrument itself and other conditions. The system mainly includes. a) Object size and load. The maximum scanning range and maximum load of the equipment are fixed and should be operated according to the requirements specified by the equipment manufacturer. Scanning angle and weight limit are performed; ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 34874.4-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 34874.4-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 34874.4-2025_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 34874.4-2025_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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