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 Wysłany: Pon 16:28, 06 Gru 2010 Temat postu: ugg italia Parking meters Uncertainty of measureme |
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Parking meters Uncertainty of measurement
Repeatability of the meter readings, class A assessment methods used were evaluated. Test of a meter point in 1802.8s 1O measurements, measured as the column: 1803s, 1803s,[link widoczny dla zalogowanych], 1803s, 1804s, 1803s, 1803s, 1804s, 1803s, 1803s, 1803s. Single measurement results calculated experimental standard deviation:. . . 422. √ a 1 ... ... so the standard uncertainty / Z, (6) is: M-(6) '. ・ 4s degrees of freedom: (6) = / 7, I 1 = 93.2.2 quantization error from the meter uncertainty, the use of Class B standard uncertainty assessment. Meter minimum resolution is 1s, the quantization error to a uniform probability distribution in the half width a = 0.5s the range,[link widoczny dla zalogowanych], according to the introduction of uniform distribution of the standard uncertainty / Z: (6) as: Dirty =- 0. 289s estimated IAu: ( lu: (6) I was 0.10, so the degrees of freedom:: (6) = 503.2.3 to read and write cards from the time the error meter uncertainty, the use of B Evaluation of standard uncertainty class. It was found that the same environmental conditions at the time to read and write cards to the maximum permissible error: ± 0.05s, which interval half width is a = 0.05s, introduced by uniform standard uncertainty / Z3 (6 ) are: Dirty =- 0. o29s estimated IAu3 ( lu3 (6) I was 0.50, so the degrees of freedom:, (6) = 4.1 24 combined standard uncertainty sensitivity factor model: T = +6 sensitivity coefficient c () = OT = 1; c (6) = OT = 1 ZHANG Ying et al: Mi Yuan parking Uncertainty of Measurement Group 4.3 Calculation of combined standard uncertainty 4.3.1 by the u (), u : () Enter the amount of synthesized standard uncertainty u () as: u () = u () + toe; () u ()=~/ u () + u ;()=~/( 0.036 ) + (0.0006) = 0.036s () = If4 (Ts) = urgent (0.036 Pu) 4 = 5. () () 50. 504.3.2 by the H (),[link widoczny dla zalogowanych], u: (), u, (synthesized input standard uncertainty u () is: M () = M () + M; () + M, 2 () u ( = ~ / u ( + u; () + u ;()=~/( 0.134) + (0.289) 2 + (0.029) = O .32 s degrees of freedom:) U4 ( Gui (0.32) 4591Q: + iQ: mat + (Q: ~ 9. 50. 24.3.3 combined standard uncertainty u () = u () + =- u ()\P = 95% of the expanded uncertainty, taken = 60, t-distribution table look up, after = 2.01, so the expanded uncertainty is: = (60) × M. (T) = 2.01 × 0. 322 = 0.65s, which contains the factor under the effective degrees of freedom: port = 60, P = 0.95 found by the t distribution table. Author: Zhang Ying, M, Assistant Engineer. work unit: Harbin, metrological verification tests . Mailing Address: Xiangfang District, Harbin 150036 Inner Mongolia, Zhujiang Road 5. Wang Bin Zhang, metrological verification tests Harbin (Harbin 150036). Received Time: 2007 A l1-27 Recently, the New Zealand Ministry of Consumer Affairs, informed the New Zealand made in China clothing test results showed that Chinese-made clothing is no problem. the past two months, New Zealand, New Zealand media reports focused on quality of Chinese products on the market problems. the spirit of Chinese products to consumers and responsible attitude on the New Zealand Consumer Affairs Department collected 100 pieces of clothing samples, carried out by an independent testing room to test the content of formaldehyde, the proportion of the market share distribution of the sample,[link widoczny dla zalogowanych], which accounted for 84% of Chinese clothing, New Zealand products and other samples were 7% and 9%. After testing , in addition to a duplicate sample is invalid, the other 99 samples of the test results showed that, 9r7 samples of the formaldehyde content is much lower than 200ppm of international standards, only two samples (one of the production Bai Zhongguo, high levels, as 250ppm, but after one washing, the formaldehyde content of the sample is reduced to 54ppm. Therefore, the two can be sold clothing label \Therefore, the overall conclusion drawn from testing garments made in China is not a problem.
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