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JJF 1796-2020: Calibration Specification for Retroreflective Standards
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JJF 1796-2020	English	489	Add to Cart	4 days [Need to translate]	Calibration Specification for Retroreflective Standards

JJF 1796-2020: Calibration Specification for Retroreflective Standards

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(Calibration standards for retroreflective standards) National Metrology Technical Specifications of the People's Republic of China Calibration specification for retroreflective standards 2020-01-17 released 2020-04-17 implementation Issued by the State Administration for Market Regulation Calibration specification for retroreflective standards Focal point. National Technical Committee of Special Measuring Instruments for Highways Main drafting unit. Institute of Highway Science, Ministry of Transport Participated in the drafting. National Transportation Safety Facilities Quality Supervision and Inspection Center National Road and Bridge Engineering Testing Equipment Metering Station China Institute of Metrology This specification entrusts the National Highway Special Measuring Instruments Metrology Technical Committee to be responsible for interpretation The main drafters of this specification. Su Wenying (Institute of Highway Science, Ministry of Transport) Wang Yixu (Institute of Highway Science, Ministry of Transport) Zhou Yishu (Institute of Highway Science, Ministry of Transport) Participating drafters. Zhu Chuanzheng (National Transportation Safety Facilities Quality Supervision and Inspection Center) Leng Zhengwei (National Road and Bridge Engineering Testing Equipment Measuring Station) Chundi Zheng (China Institute of Metrology) Lin Zhidan (National Road and Bridge Engineering Testing Equipment Metering Station)

table of Contents

Introduction (Ⅱ) 1 scope (1) 2 Reference documents (1) 3 Term (1) 4 Overview (2) 5 Measurement characteristics (2) 6 Calibration conditions (4) 7 Calibration items and calibration methods (6) 8 Calibration results (7) 9 Recheck interval (7) Appendix A Calibration record style of retroreflective standard device (8) Appendix B Retroreflective Standard Calibration Certificate Information and Inner Page (13) Appendix C Example of Uncertainty Evaluation of Retroreflective Value Calibration of Retroreflective Standards (14)

Introduction

This specification is based on JJF 1071-2010 "Rules for the Compilation of National Metrology and Calibration Specifications", JJF 1059.1-2012 "Evaluation and Expression of Measurement Uncertainty" will be formulated. This specification is released for the first time. Calibration specification for retroreflective standards

1 Scope

This specification applies to the calibration of retroreflective standards.

2 Reference documents

This specification refers to the following documents. JJF 1059.1 Evaluation and expression of measurement uncertainty GB/T 18833 Road traffic reflective film GB/T 24717 Road pre-formed marking tape GB/T 24725 Protruding road signs GB/T 26377 Retroreflective measuring instrument JT/T 688-2007 Retroreflective terminology For dated reference documents, only the dated version applies to this specification; for undated reference documents, The latest version (including all amendments) is applicable to this specification.

3 term

The following terms and definitions defined in JT/T 688-2007 apply to this specification. 3.1 Retroreflectivestandard Certified reference material used to calibrate retroreflective measuring instruments. 3.2 datummark Use the arrow to mark on the back of the retroreflective standard or an appropriate position to indicate the direction of sample placement during calibration. The arrow direction is 0° reference direction (referred to as "reference direction"), which can be changed by rotating the corresponding angle counterclockwise during calibration. Change the reference direction. 3.3 retroreflection Reflected light is a kind of reflection that returns from the opposite direction close to the incident light. [JT/T 688-2007,2.1] 3.4 entrance angle The angle between the illumination axis and the reference axis is represented by β. Note. The incident angle β is decomposed into two components β1 and β2 in the goniometer system, usually not greater than 90°. [JT/T 688-2007,2.21] 3.5 Observation Angle The angle between the illumination axis and the observation axis is represented by α. Note. The observation angle is not a negative value, usually less than 2°. ...