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JJF 1688-2018 English PDF

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JJF 1688-2018: Calibration Specification for Real-time Focus Meters
Status: Valid

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJF 1688-2018	English	329	Add to Cart	3 days [Need to translate]	Calibration Specification for Real-time Focus Meters	Valid	JJF 1688-2018

PDF similar to JJF 1688-2018

Standard similar to JJF 1688-2018

GB/T 3222.1 JJG 188 JJF 1396 JJF 2017 JJF 1927 JJF 1687

Basic data

Standard ID	JJF 1688-2018 (JJF1688-2018)
Description (Translated English)	Calibration Specification for Real-time Focus Meters
Sector / Industry	Metrology & Measurement Industry Standard
Classification of Chinese Standard	A58
Word Count Estimation	14,148
Date of Issue	2018-02-27
Date of Implementation	2018-05-27
Regulation (derived from)	AQSIQ Announcement No. 26 of 2018
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine

JJF 1688-2018: Calibration Specification for Real-time Focus Meters

---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.
(Real-time focus meter calibration specifications) National Metrology Technical Specification of the People's Republic Real-time focus measuring instrument calibration specification Published on.2018-02-27 2018-05-27 implementation The General Administration of Quality Supervision, Inspection and Quarantine issued Real-time focus measuring instrument calibration specification Focal Point. National Ionizing Radiation Measurement Technical Committee Main drafting unit. China Testing Technology Research Institute Zunyi City Product Quality Inspection and Testing Institute Participated in drafting unit. Fujian Institute of Metrology Zigong City Metrology and Testing Institute Leshan Metrology and Testing Institute Chengdu Second People's Hospital This Code entrusts the National Ionizing Radiation Measurement Technical Committee to explain The main drafters of this specification. Zhang Conghua (China Testing Technology Research Institute) Li Mingyu (Zunyi City Product Quality Inspection and Testing Institute) Liu Cao (China Testing Technology Research Institute) Participate in the drafters. Dong Xu (Fujian Institute of Metrology) Zhong Hong (Zigong Metrology and Testing Institute) Chen Yuqiao (Leshan Metrology and Testing Institute) Qiu Jianmeng (Chengdu Second People's Hospital)

Introduction (II) 1 Scope (1) 2 References (1) 3 terms and units of measurement (1) 3.1 Terminology (1) 3.2 Unit of measurement (1) 4 Overview (1) 5 Measurement characteristics (2) 5.1 Focus range (2) 5.2 Radiation quality range (2) 5.3 Resolution (2) 5.4 indication error (2) 5.5 Repeatability (2) 6 Calibration conditions (2) 6.1 Environmental conditions (2) 6.2 Measurement standards and other equipment (2) 7 Calibration items and calibration methods (2) 7.1 Calibration Preparation (2) 7.2 Resolution (4) 7.3 indication error (4) 7.4 Repeatability (5) 8 calibration result expression (5) 9 re-interval time interval (5) Appendix A Calibration Original Record (Recommended) Format Style (6) Appendix B Calibration Certificate Inner Page (Recommended) Format Style (7) Appendix C Example of Uncertainty Evaluation of Measurement Error Measurement Results (8)

Introduction

This specification is based on JJF 1001-2011 "General Terms and Definitions of Measurement", JJF 1059.1-2012 The determination and representation of certainty, JJF 1071-2010, the preparation of the National Metrology Calibration Specification. For the actual situation of the X-ray machine real-time focus measuring instrument, the development of this calibration specification refers to JJG744- 2004 "medical diagnostic X-ray source" verification procedures and IEC 60336.2005 "medical electrical equipment medical diagnosis The basic method of slit-type measurement focus in the X-ray tube assembly focus characteristics. This specification is the first release. Real-time focus measuring instrument calibration specification

1 Scope

This specification applies to the calibration of real-time focus measuring instruments.

2 reference files

This specification refers to the following documents. JJG744-2004 Medical diagnostic X-ray source IEC 60336.2005 medical electrical equipment medical diagnostic X-ray tube assembly focus characteristics (Medical electricalequipment-X-raytubeassembliesformedicaldiagnosis-Characteristicsoffo- Calspots) For dated references, only dated versions apply to this specification; undated quotations The latest version is applicable to this specification.

3 terms and units of measure

3.1 Terminology 3.1.1 actual focus actualfocalspot Receiving a target surface area that accelerates the electron beam. 3.1.2 effective focus effectivefocalspot The actual focus is on the vertical projection of the reference plane. 3.1.3 line extension function linespreadfunction In an imaging system, normalization of the line source radiation intensity along a linear direction on the image plane is specified distributed. 3.1.4 focus length focalspotlength On the reference plane, the distance between the peaks of the linear spread function along the long axis of the X-ray tube is 15%. 3.1.5 focus width focalspotwidth On the reference plane, the distance between the peaks of the linear spread function along the long axis of the vertical X-ray tube is 15%. 3.1.6 focus reference value referencevalueofeffectivefocalspot The geometry of the effective focus, often referred to as the length or width of the focus. 3.2 Unit of measurement Unit name of the X-ray machine focus size. mm; symbol. mm.

4 Overview

A real-time focus measuring instrument (hereinafter referred to as a focus meter) is a direct sensing radiation intensity distribution using a sensitive component. An instrument that measures the focus of the X-ray machine. Focus meter based on the principle of ionization excitation to generate transitional light, detection

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