GB/T 33691-2017 in English
VALIDTest method for cup anemometer
- Issued on:2017-05-12
- Implemented on:2017-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 33691-2017杯式测风仪测试方法》由TC507（全国气象仪器与观测方法标准化技术委员会）归口，主管部门为中国气象局。
Introduction
National Standard of the People's Republic of China GB/T 33691—2017
Test Method of Cup Anemometer
Background of Standard Formulation and Analysis of Technical Evolution
This standard is formulated based on the technical development needs of meteorological instruments and observation methods, and aims to standardize the laboratory test methods of cup anemometers. In recent years, with the advancement of meteorological observation technology, the accuracy requirements for wind speed and wind direction measurement have been continuously improved, and this standard has come into being.
Comparative analysis of standard frameworks
| Standard dimensions | GB/T 33691—2017 | JJG 431—2014 | QX/T 8—2002 |
|---|---|---|---|
| Test scope | Cup anemometer performance test | Portable three-cup wind direction and speed meter | Meteorological instrument terms and definitions |
| Core indicators | Wind vane starting wind speed, wind direction measurement error, etc. | Wind cup starting wind speed, wind speed measurement error, etc. | Geometry of wind cups and structure of wind vanes |
| Applicable scenarios | Testing under laboratory environmental conditions | Application in field meteorological stations | Study of meteorological observation methods |
Explanation of professional terms and practical application cases
Determination of wind cup starting wind speed
The wind cup starting wind speed refers to the minimum wind speed required for the wind cup to start continuous rotation from a stationary state. In a laboratory environment, this indicator can be accurately measured through wind tunnel testing. For example, in the GB/T 33691-2017 standard, it is required to increase the wind speed step by step by 0.1 m/s, observe the starting state of the wind cup, and record the corresponding standard wind speed value.
Detailed explanation of test conditions and methods
- Laboratory environment requirements: The temperature range is 15°C ~ 30°C, the relative humidity does not exceed 85%, and the atmospheric pressure is between 500 hPa ~ 1060 hPa.
- Standard instruments and supporting equipment: Including key equipment such as pitot-static tube, digital micromanometer, universal angle ruler, etc., and their technical indicators are detailed in Table 1.
Implementation suggestions and precautions
Calibration suggestions: Before formal testing, all standards need to be calibrated and their maximum allowable errors recorded. For example, the relative uncertainty of the pitot-static tube Uc should not be greater than 0.5%.
Test sequence optimization: It is recommended to test the vane starting wind speed and wind direction measurement error first, and then test the cup starting wind speed and wind speed measurement error to ensure the consistency of the experimental data.
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