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Product quality testing and application of uncertainty analysis


Degree of application examples such as: at 25 ℃,[link widoczny dla zalogowanych], the measured flow through a standard resistor current is 20mA. Given that the standard resistance at 20 ℃ and the calibration value of loo. 050, the certificate gives the calibration uncertainty of 0.01Q (k = 2), a temperature coefficient of resistance for the 15 × 10 ~ / ~ C, the error limit is ± 1 × 10 ~ / ~ C, Temperature Measurement thermometer of the allowable error limit of ± 0.02 ℃; measurement error of the voltmeter reading ± 0.2%. Standard resistor voltage drop requirements and measurement uncertainty. 4.1 The mathematical model V = R, = Ro 【1 + population (t A 20) J, are known to Rn = loo. 05Qa = 15 × 100 / ~ Ct = 25't7, = 20mA so V = loo. 05 [1 +15 × 10 a (25-20)] 20 = 2.151V4.2 standard uncertainty of each component and the sensitivity coefficient of M (): 0.01:0.0050 II (oral): L. B: 0.577 × 10 A s / ~ C //,// 113 / (set to all ports, =-- ■ -=- a = U. × 43 uniform distribution of Osaka knife) M (f): 0 - . 02 ~ a C: 0.0115 't7 (set uniform distribution) 43M (,):- 20 - ~ 0. A 2/loo: one. 023mA13 (set evenly divided bamboo knife Sakamoto M 』,[link widoczny dla zalogowanych],=--_=.' 43 cloth) cl == [1 + population (f a 20)] I = [1 +15 × 10 (25-20)] 20 = 21.5mAc2 == Ro (f a 20) I = loo. O5 (25-20) 20 = 10005oCmAc3 == RoaI: 100.05 × 15 × 10 A × 20:30.015 OmA / ~ Cc: = R. [1 + population (f a 20)] = loo. 0511 +15 × 10 (25-20)] = 107.55404.3 find the combined standard uncertainty uc (v) = ~ / clu (r ~ Y + o2u (a) 2 + e3u (ty + e4u (iy = (21.5 × 0.OO5) + (10005 × 0.577 × 10 a) + (3O.015 × 0.0115) + (107.554 × 0.023) = 2.5mV = 0.0025V4.4 obtained expanded uncertainty k = 2, then: U = l (V) = 2 × 0.OO25 = 0.OO50V (95% confidence level) results expressed as: Standard resistor voltage drop V = 2.151V, U = 0.OOSOV (k = 2). 5 Conclusion measurement uncertainty is an important measurement concepts, but also to ensure that measuring and testing the quality of the important elements. are areas of our country into the management of legal metrology. With China's accession to WTO, in the experimental room certification, metrology, testing and other fields fully implement the national metrology standards and international standards on the common practice is to us in measuring and testing professionals work made a very urgent task. work in product testing, in order to to avoid the conditions of measurement methods and measurement results of different controversial measure on the important data to develop appropriate testing procedures should be, and based on the principle of measurement uncertainty on the measurement results of Uncertainty, which can effectively improve efficiency and reduce risk, in this application on the basis of national measurement standards for terminology and measurement uncertainty evaluation,[link widoczny dla zalogowanych], stop use and the phasing out of traditional habits, but imprecise terms used and practices conducive to China's measurement and testing areas the overall level of increase. Reference JJF1059-1999, Evaluation and Expression of Uncertainty in Measurement [S]. Beijing: China Metrology Publishing House, 2000. Keqin. uncertainty in testing the application of [M]. safety and electromagnetic compatibility China Electronics Standardization Institute, 2001. Yang Yuan, Guo-Ping Wu, et al. electrical quality testing uncertainty [M]. Beijing: China Standard Press,[link widoczny dla zalogowanych], 2002. Zhao Jiarui. uncertainty about electrical issues related to product testing of [ ,[link widoczny dla zalogowanych],],[Measurement Press, 1996.1J1J1J1J1J1Jnb

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