JJF 1801-2020 English PDF

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JJF 1801-2020: Calibration Specification for Linear Velocity Measuring Instrument
Status: Valid

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Basic data

Standard ID: JJF 1801-2020 (JJF1801-2020)
Description (Translated English): Calibration Specification for Linear Velocity Measuring Instrument
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A53
Classification of International Standard: 17.160
Word Count Estimation: 19,125
Date of Issue: 2020
Date of Implementation: 2020-04-17
Issuing agency(ies): State Administration for Market Regulation

JJF 1801-2020: Calibration Specification for Linear Velocity Measuring Instrument

---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.
(Calibration specification for linear velocity measuring instrument) National Metrology Technical Specifications of the People's Republic of China Calibration specification for linear velocity measuring instrument 2020-01-17 released 2020-04-17 implementation Issued by the State Administration for Market Regulation Calibration specification for linear velocity measuring instrument Focal point. National Technical Committee of Vibration and Shock Speed Measurement Main drafting unit. Henan Institute of Metrology Jiangxi Institute of Metrology and Testing Participated in the drafting unit. China Institute of Metrology Shaanxi Institute of Metrology Beijing Institute of Metrology and Testing This specification entrusts the National Technical Committee of Vibration and Shock Speed Measurement to be responsible for the interpretation The main drafters of this specification. Sun Qinmi (Henan Institute of Metrology) Yang Qiqi (Jiangxi Institute of Metrology and Testing) Zhang Zhongjie (Henan Institute of Metrology) Participating drafters. Wang Xiaowei (Henan Institute of Metrology) Fan Zhe (China Institute of Metrology) Zhang Chongwu (Shaanxi Institute of Metrology) Yu Baoliang (Beijing Institute of Metrology and Testing Science)

table of Contents

Introduction (Ⅱ) 1 scope (1) 2 Reference documents (1) 3 Term (1) 4 Overview (1) 5 Measurement characteristics (2) 6 Calibration conditions (2) 6.1 Environmental conditions (2) 6.2 Measurement standards and other equipment (2) 7 Calibration items and calibration methods (3) 7.1 Calibration items (3) 7.2 Calibration method (3) 8 Calibration result expression (5) 9 Recalibration interval (5) Appendix A. Schematic diagram of calibration method for linear velocity measuring instrument (6) Appendix B Calibration Record of Linear Velocity Measuring Instrument (7) Appendix C Example of Uncertainty Evaluation of Linear Velocity Indication Error of Contact Linear Velocity Measuring Instrument (8) Appendix D Example of Uncertainty Evaluation of Linear Velocity Indication Error of Double-point Linear Velocity Measuring Instrument (11)

Introduction

This specification is based on JJF 1071 "Rules for the Compilation of National Metrology and Calibration Specifications", JJF 1059.1 "Measuring Uncertainty "Assessment and Representation" and other measurement technical specifications are compiled. This specification mainly refers to JJG105 "speed meter", JJG326 "speed standard device", JJF 1193 "non-connected Measurement technical specifications such as the Calibration Specification for Touch-Type Automobile Speedometer, JJF 1156 "Terms and Definitions for Vibration and Impact Speed Measurement". This specification is released for the first time. Calibration specification for linear velocity measuring instrument

1 Scope

This specification applies to (0.1~4)m/s contact linear velocity measuring instrument and (0.3~30)m/s double-point linear velocity For the calibration of measuring instruments, other linear velocity measuring instruments can be calibrated with reference to this specification.

2 Reference documents

This specification refers to the following documents. JJG105 Tachometer JJG326 Speed standard device JJF 1156 Vibration impact speed measurement terms and definitions JJF 1193 Non-contact car speedometer calibration specification 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

3.1 Linear speed The displacement of any point on the rotating rigid body in unit time. It can be used to describe the motion characteristics of any point on a rotating rigid body. 3.2 Two-point linear velocity measuring instrument A measuring instrument that measures the linear velocity of a rotating rigid body or the linear velocity of an object moving in a straight line with two measuring points at a fixed position.

4 overview

Linear speed measuring instruments are divided into contact linear speed measuring instruments and non-contact linear speed measuring instruments. Contact line speed The degree measuring instrument is generally composed of a speed plate connected with a front shaft and a collection part. When the working surface of the speed plate is When the measured object is in contact, the linear velocity of the measured object is measured according to the circumference and speed of the speed plate. Commonly used non-contact line The speed measuring instrument is a two-point linear speed measuring instrument, which is composed of a pair of switch sensors and supporting collectors. When the two sensors are firmly installed on the path of the measured object at a certain distance, by measuring the measured object The length of the path between the two sensors and the time when the measured object triggers the two sensors to calculate the line of the object speed. Figure 1 is a block diagram of the working principle of the contact linear velocity measuring instrument, and Figure 2 is the working principle of the double-point linear velocity measuring instrument The schematic block diagram, Appendix A is a schematic diagram of the calibration method. ......

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