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JJF 1934-2021 English PDF

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JJF 1934-2021: Calibration Specification for Ultrasonic Anemometers
Status: Valid

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJF 1934-2021	English	529	Add to Cart	4 days [Need to translate]	Calibration Specification for Ultrasonic Anemometers	Valid	JJF 1934-2021

PDF similar to JJF 1934-2021

Standard similar to JJF 1934-2021

GB/T 3222.2 GB/T 3222.1 JJG 188 JJG 1190 JJF 2012 JJG 1175

Basic data

Standard ID	JJF 1934-2021 (JJF1934-2021)
Description (Translated English)	Calibration Specification for Ultrasonic Anemometers
Sector / Industry	Metrology & Measurement Industry Standard
Classification of Chinese Standard	A59
Classification of International Standard	17.140
Word Count Estimation	24,267
Date of Issue	2021-12-08
Date of Implementation	2022-06-08
Issuing agency(ies)	State Administration for Market Regulation
Summary	This standard applies to the calibration of ultrasonic wind direction and speed measuring instruments for measuring two-dimensional wind fields.

JJF 1934-2021: Calibration Specification for Ultrasonic Anemometers

---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.
National Metrology Technical Specifications of the People's Republic of China Calibration specifications for ultrasonic wind direction and speed measuring instruments Released on 2021-12-08 2022-06-08 Implementation Released by the State Administration for Market Regulation Ultrasonic wind direction and wind speed measuring instrument Calibration specification Responsible unit: National Meteorological Measuring Instruments Measuring Technical Committee Main drafting unit: Meteorological Observation Center of China Meteorological Administration Participating in the drafting unit: Hubei Provincial Meteorological Information and Technical Support Center Heilongjiang Atmospheric Sounding Technology Support Center Xinjiang Meteorological Technology Equipment Support Center Jiangsu Institute of Radio Science Co:, Ltd: This specification entrusts the National Meteorological Measuring Instruments and Measuring Technical Committee to be responsible for interpretation The main drafters of this specification: Bian Zeqiang (Meteorological Observation Center of China Meteorological Administration) Li Songkui (Meteorological Observation Center of China Meteorological Administration) Liu Xin (Meteorological Observation Center of China Meteorological Administration) Participating drafters: Zeng Tao (Hubei Meteorological Information and Technical Support Center) Huang Qingzhi (Heilongjiang Atmospheric Sounding Technology Support Center) Ma Jing (Xinjiang Meteorological Technology Equipment Support Center) Zhou Qi (Jiangsu Institute of Radio Science Co:, Ltd:)

Introduction (Ⅱ) 1 Scope(1) 2 References(1) 3 Terms and units of measurement(1) 3:1 Terminology(1) 3:2 Units of measurement(1) 4 Overview(1) 5 Metrological characteristics* (2) 5:1 Wind speed indication error (2) 5:2 Wind direction indication error (2) 5:3 Wind speed direction error (2) 6 Calibration conditions(2) 6:1 Environmental conditions (2) 6:2 Metrology standard measuring equipment and other equipment (2) 7 Calibration Items and Calibration Methods(3) 7:1 Calibration items(3) 7:2 Calibration method(3) 8 Expression of Calibration Results(4) 9 Recalibration interval(5) Appendix A Calculation method of standard wind speed value (6) Appendix B Calibration Records of Ultrasonic Wind Direction and Velocity Measuring Instruments (Reference Format) (7) Appendix C Calibration Certificate (Reference Format) (8) Appendix D Example of Uncertainty Assessment of Wind Velocity Measurement (11) Appendix E Example of Wind Direction Measurement Uncertainty Assessment (16)

Introduction

JJF 1071 "Rules for Compilation of National Metrology and Calibration Standards", JJF 1001 "General Metrology Terms and Definitions", JJF 1059:1 "Assessment and Expression of Measurement Uncertainty" together constitute the basic series supporting the preparation of this specification specification: This specification is published for the first time: Calibration specifications for ultrasonic wind direction and speed measuring instruments

1 Scope

This specification applies to the calibration of ultrasonic wind direction and speed measuring instruments for measuring two-dimensional wind fields:

2 References

This specification references the following documents: JJG431-2014 Portable three-cup wind direction anemometer QX/T 8-2002 Meteorological Instrument Terminology QX/T 84-2007 Meteorological low-speed wind tunnel performance test specification For dated references, only the dated version applies to this specification; for undated references document, its latest version (including all amendments) applies to this specification:

3 Terminology and units of measurement

3:1 Terminology 3:1:1 wind direction The direction of the wind: [Source: QX/T 8-2002, definition 5:4:2] 3:1:2 wind speed The distance air moves per unit time: [Source: QX/T 8-2002, definition 5:4:3] 3:1:3 Ultrasonic anemometer A wind measuring instrument made according to the principle that the propagation speed of ultrasonic waves in the air changes with the change of wind speed: [Source: QX/T 8-2002, definition 5:4:46] 3:1:4 Wind speed and direction characteristics directionalresponse The ultrasonic wind direction and wind speed measuring instrument is installed vertically, and can be measured from any direction under a certain fixed wind speed in the horizontal direction: errors caused by the quantity: 3:2 Units of measurement The unit of measurement for wind speed is meter per second (m/s); the unit of measurement for wind direction is degree (°):

4 Overview

Ultrasonic wind direction and wind speed measuring instrument is to use the sending sound wave pulse to measure the time or frequency of the receiving end (Doppler Transformation) difference to calculate the wind speed and direction of the measuring sensor or measuring instrument: Its appearance is shown in Figure 1: Ultrasonic wind direction and wind speed measuring instruments are usually composed of sending end, receiving end, bracket, data acquisition and other parts: hair The sending end and the receiving end are equidistantly parallel at a certain distance, and the sending end sends out sound waves, which will

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