共查询到20条相似文献,搜索用时 46 毫秒
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数字指示轨道衡称量检定的不确定度评定及应用 总被引:1,自引:0,他引:1
据JJG781—2002《数字指示轨道衡》检定规程。检定数字指示轨道衡时必须记录置零准确度、偏载检定、称量检定、鉴别力检定、重复性检定这五项检定项目的数据。分析这5项检定项目。鉴别力检定属于灵敏度检验。由于采用闪变点法,这项不确定度较小且不直接作用于称量结果:而偏载检定、重复性检定及置零准确度三项检定结果则直接贡献于称量检定结果的不确定度并传递到货物称量。称量检定结果是给出称量示值误差,因此本文探讨称量示值“化整前的修正误差”的不确定度评定及其应用。 相似文献
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介绍了用标准时间间隔发生器检定秒表时,测量结果不确定度分析和评定过程;讨论了测量不确定度的几个主要来源;通过一组实例,给出了秒表检定不确定度的分析和评定结果,该过程和结论可应用在对于计量标准进行相应指标的不确定度分析上,也可用于估计秒表检定本身的不确定度。 相似文献
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介绍了采用一等活塞式压力计检定压力变送器的测量方法,分析了该检定方法的测量数学模型和测量结果的不确定度分量的来源,计算出测量结果的各标准不确定度分量和扩展不确定度。 相似文献
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以一体化互感器检定装置检定电流互感器为例,依据JJF1059—1999《测量不确定度评定与表示》规定,对标准电流互感器检定装置中电流互感器比值差测量结果不确定度进行了评定,并通过计算,指出了影响其测量结果不确定度的因素和来源。 相似文献
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《中国新技术新产品》2019,(23)
作为强制检定计量器具的燃油加油机遍布全国,其准确性关系到人民日常生活消费。为了更好地对所使用的燃油加油机示值误差检定结果进行合格判定,确保燃油加油机准确公正,建议引入测量不确定度应用于合格判定,至关重要。该文对燃油加油机示值误差检定的测量不确定度进行了分析,确定测量不确定度应用基础,参考使用ISO/IEC 17025:2017不确定度要求,总结出测量不确定度在燃油加油机示值误差检定中的应用,帮助检定人员更准确进行合格判定,规避风险。 相似文献
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电阻箱检定时测量不确定度的评价 总被引:2,自引:0,他引:2
介绍了用QJ48型直流比较电桥装置检定电阻箱时,测量标准不确定度的分析和评价过程;讨论了影响评价结果不确定度的几个主要来源;通过一组实例,给出了电阻箱检定不确定度的分析和评价结果,该过程和结论可应用在对于计量标准进行相应指标的不确定度分析上,也可用于估计电阻箱检定本身的不确定度。 相似文献
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A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling. 相似文献
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An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a
rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate
agreement is demonstrated between the derived relations and experimental data. 相似文献
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Liebert A Wabnitz H Grosenick D Möller M Macdonald R Rinneberg H 《Applied optics》2003,42(28):5785-5792
A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue. 相似文献
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水三相点是开尔文热力学温度的唯一基准点,也是ITS-90国际温标重要的定义固定点。因此,水三相点不确定度分析对整个温标的建立、温度量值传递起着至关重要的作用。近3年来,中国计量科学研究院研制出一系列高质量的水三相点容器,加强了水三相点的研究,为不确定度的分析提供了更为可靠的实验依据。同时,不确定度的分析也是客观评价新研制容器性能的一个重要指标。因此,根据实验结果对新研制容器所复现的水三相点进行了不确定度评定。评定结果表明,其扩展不确定度为0.16mK(k=2.69,P=0.99)。 相似文献
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Conventional methods for summation of direct measurement errors are considered. Conditions under which these methods provide consistent results are stated. It is proposed to utilize for characteristic of the total error, its interval estimator or the half-sum of the value obtained by adding up its arithmetic and geometric random errors.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 10–12, April, 1995. 相似文献