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JJF 1808-2020 English PDF

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JJF 1808-2020: Calibration Specification for Bullet Speed Measuring Devices
Status: Valid

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJF 1808-2020	English	509	Add to Cart	4 days [Need to translate]	Calibration Specification for Bullet Speed Measuring Devices	Valid	JJF 1808-2020

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GB/T 3222.1 JJF 1234 JJF 1396 JJF 1901 JJF 1900 JJF 1805

Basic data

Standard ID	JJF 1808-2020 (JJF1808-2020)
Description (Translated English)	Calibration Specification for Bullet Speed Measuring Devices
Sector / Industry	Metrology & Measurement Industry Standard
Classification of Chinese Standard	A57
Classification of International Standard	17.080
Word Count Estimation	23,255
Date of Issue	2020
Date of Implementation	2020-04-17
Issuing agency(ies)	State Administration for Market Regulation

JJF 1808-2020: Calibration Specification for Bullet Speed Measuring Devices

---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.
(Calibrating specification of bullet speedometer) National Metrology Technical Specifications of the People's Republic of China Calibration specification for bullet speedometer 2020-01-17 released 2020-04-17 implementation Issued by the State Administration for Market Regulation Calibration specification for bullet speedometer Focal point. National Technical Committee of Time and Frequency Measurement Main drafting unit. Shandong Institute of Metrology Jiangsu Institute of Metrology Participating in the drafting unit. Shandong Provincial Social Fair Measurement Bank Shandong Metrology Testing Center Liaoning Institute of Metrology This specification entrusts the National Time and Frequency Measurement Technical Committee to be responsible for interpretation The main drafters of this specification. Li Wenqiang (Shandong Institute of Metrology) Guan Zexin (Shandong Institute of Metrology) Wu Jun (Jiangsu Institute of Metrology) Participating drafters. Gao Zhishang (Shandong Institute of Metrology) Wang Shang (Shandong Social Fair Measurement Bank) Sun Xiaoyan (Shandong Metrology and Testing Center) Jin Yuehong (Liaoning Institute of Metrology)

Introduction (Ⅱ) 1 scope (1) 2 Reference documents (1) 3 Overview (1) 4 Measurement characteristics (2) 5 Calibration conditions (2) 5.1 Environmental conditions (2) 5.2 Measuring equipment and other equipment(2) 6 Calibration items and calibration methods (3) 6.1 Calibration items (3) 6.2 Calibration method (3) 7 Expression of calibration results (5) 8 Recalibration interval (6) Appendix A Calibration Original Record Format (7) Appendix B Internal page format of calibration certificate (9) Appendix C Evaluation Example of Measurement Uncertainty (10) Appendix D Standard Time Interval and Speed Comparison Table (17)

Introduction

This specification is based on JJF 1071-2010 "Rules for the Compilation of National Metrology and Calibration Specifications" and JJF 1059.1-2012 "Evaluation and Expression of Measurement Uncertainty" was compiled. This specification is released for the first time. Calibration specification for bullet speedometer

1 Scope

This specification is applicable to bullet speedometers that use the photoelectric speed measurement principle and the speed range is 10m/s~1000m/s. For calibration, this specification does not apply to bullet speedometers with other speed measurement principles.

2 Reference documents

This specification refers to the following documents. GA/T 718 The Forensic Scientific Identification Criteria of Firearms GA/T 824 Code for the construction of forensic science bullet inspection laboratory 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 overview

The bullet velocimeter is a measurement of various barrel shooting weapons (using tubular equipment to launch projectiles, usually smaller than 20mm) instruments or equipment with parameters such as the firing speed and specific kinetic energy of the metal or other material projectiles, which work The principle is that the bullet passes through the two layers of photoelectric screens in turn to generate photoelectric signals, and the time interval measurement unit measures the trigger light of the front and rear screens. The time interval of the electrical signal is combined with the distance between the two screens for data processing to obtain the bullet speed. The bullet speedometer is generally composed of It is composed of photoelectric screen, speed measurement and display unit and output printing part, which is widely used in criminal investigation, Forensic appraisal and research on gun performance, etc.

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