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Automatic Weather Observation System of temperature, pressure measurement uncertainty of the assessment criteria


6959.6959.6959.6959.6959.6959.6959.6959.6959.6Y959.32959.35959.35959.35959.35959.33959.35959.40959.40959.37 △ Y0.280.250.250.250. 25O. 27O. 250.2O0.2O0.230.243hPaY95 370 digital pressure meter (repeatability) of the difference between the average Y95 = 0.272hPaU as second-class standard mercury barometer measurement uncertainty U = 0.15hPa Based on the above comparison results IY95 pressure Y95 and meet one I ≤ √ u; 5 + 【, 2 validated the results of the calibration. 2.5 Conclusion proven, automated weather observing systems to meet the temperature standard Bureau of Meteorology automatic weather station on-site calibration method (trial) requirements, can be carried out using the standard automated weather observation system (Automatic Weather Station) on-site calibration. 2.6 annotated original national meteorological observation instruments used by the system are the manual observation device, in recent years through the continuous efforts of scientists has successfully developed an automatic weather observation system, for which the actual situation of China Meteorological Administration, developed under the automatic weather station Field calibration method (trial),[link widoczny dla zalogowanych], and for the verification of the Sichuan meteorological measurement site with a full set of Standard device calibration and field calibration of equipment (so far only set of Sichuan Province), a full set of Standard device and field equipment calibration measured by the national meteorological station on a test testing testing agency qualified. The weather system in our province since 2001,[link widoczny dla zalogowanych], the State built the Three Gorges project in the province the first ten automated weather observation system has been completed the operational automatic weather observing systems to use, automated weather observing systems in the air, water, electricity, railways and other departments has also been widely used, that it is gradually replaced by manual observation instrument for monitoring and measurement of meteorological elements. In order to ensure metrological verification, calibration quality, safeguard the national and the interests of users, to further improve the management system and continuously improve the quality and level of service, the Sichuan meteorological measurement test in April 2003 began to assume the province's meteorological automatic weather observation system transfer of the value measured. About the author: Zhang Hu, male, engineer. Company: Sichuan meteorological measurement test of the. Address: 610072, Chengdu Guanghua Village Street No. 2O. Xiao-Hong Li, Shi Peng, Sichuan meteorological measurement test of the (Chengdu 610072). Received Time: 2o09-03-2O (on the next section 7O page) Table 35, the combined standard uncertainty (V )=~/()+()+( fl1 )+()+( deleted +()+/ z2 () = 4.31 × 10-3L6 effective degrees of freedom ~ 'eff, f are functions of Rb r (Vs)' r ()。\r (%) 7 expanded uncertainty 95% confidence level, taking = 20, t = 2.09 So look-up table was expanded uncertainty as: Uo.95: t households × z ? = 2.09 × 4.31 × 10 one. = 9.01 × 10 one. (L) relative expanded uncertainty is: U95 = 9.01 × 10 a. / 100 × 100% = 0.009% 8 Conclusion Analysis of uncertainty in the above report overlooked component of the thermometer when the impact of uncertainty, according to (6): 1 = V [1 + △ (1 a)] + z3H ~ with 100L second first-class standard metal gauges calibration standard metal container, temperature performance in the medium (water) at the two gauges the temperature difference △ f, if the temperature difference is small enough, tends to 0 ℃, metal gauges were calibrated volume of value only with standard metal gauges of volume value,[link widoczny dla zalogowanych], zero-scale reading, indexing standards used by the volume of the test glass container and dividing the volume level when the readings on the test. References [1] JJGa59-2005 Standard Metal Tank verification. China Metrology Publishing House , 2005,10. [2] JJ ~ 059-1999 Evaluation and Expression of Uncertainty in Measurement. China Metrology Publishing House,[link widoczny dla zalogowanych], 1999. 4.I3] JJF1033-2001 Check for Standard of measurement. Author: Liu Yahui, male, Engineer. Unit: Institute of Metrology and Quality Inspection of Chongqing. Mailing Address: Jiangbei District, Chongqing 400020 North Third Estate, 17. in the spirit Zhaokai Jian, Chongqing Academy of Metrology and Quality Inspection (Chongqing 400020, China). Received :2009-02-10

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