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简要介绍了流量积算仪的基本原理,并以JJG1003-2005《流量积算仪》检定规程为依据,对目前比较常用的YYJL流量积算仪示值误差检定结果的不确定度进行了分析和评定。 相似文献
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随着JJG164-2000《液体流量标准装置》的实施,对装置已经不再采用误差的概念来评定,虽然液体流量标准装置对不确定度有一个分析,但由于其未考虑到系统效应带来的不确定度,同时,也未给出自由度,因而是不完全的。本文以我院建立的静态容积法水表检定装置为例,试图对水表检定装置的不确定度进行评定。 相似文献
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仪表着陆信号发生器是仪表着陆系统机载设备的专用检测设备,目前国内还没有公开发布的关于仪表着陆信号发生器的国家或行业范围内的检定/校准技术标准。本文通过对仪表着陆系统原理进行剖析,从仪表着陆信号发生器工作特点入手,对航向信标、下滑信标、指点信标等信号特点进行分析,给出了计量特性,并基于频谱分析仪直接测量法给出了各项计量特性的校准方法,同时对频谱分析仪引入的测量不确定度进行了分析,用GUM法评定了扩展不确定度。结果表明,给出的校准方法可满足仪表着陆信号发生器关键参数的校准需求,使用频谱分析仪校准符合仪表着陆信号发生器各计量特性的量值溯源要求。 相似文献
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fF量级高频微小电容测量在军工电子产品领域有着重要作用,针对微小电容测量仪500fF/1MHz点无法溯源的现状,研制了惰性气体封装的500fF高频标准电容器作为传递标准。建立高频小电容测量模型,基于“反算法”估算出500fF高频标准电容器分布参数,称作“理论推导”溯源方案,不确定度优于0.15%;利用3台同等量级的高频微小电容测量传递标准,称作“计量比对”溯源方案,不确定度优于0.07%。利用以上2种方案对同1台仪器开展溯源,实验数据结果基本一致,能够满足用户使用要求,为更低容值、更高频率的微小电容的溯源提供了可参考的路径。 相似文献
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It is important to precisely measure flatness of the optical flats, as many industries use these as reference standards to ensure the quality of precision measurements and fabricated components. This paper describes identification of sources of error and measurement uncertainty evaluation for three flat test. Three flat test is used for absolute flatness measurement of optical flats, with the help of Fizeau interferometer (VerifireXP/D, with phase shift interferometry) established recently at National Physical Laboratory, India (NPL-I). The absolute profile of reference flat with higher accuracy can be determined using liquid level reference but liquid flat reference is more difficult to realize practically. Therefore three flat test is frequently adopted in standard interferometric measurements and traceability of this test can also be established by using a traceable laser head. This paper describes three flat method in detail along with observations and evaluation of measurement uncertainty as per ISO GUM is also done. Factors contributing to uncertainty of measurement of surface flatness have been indentified and detailed evaluation of uncertainty in measurements has been reported here. 相似文献
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以焓值法的直接测试量表征的制冷量和制热量计算公式作为基础数学模型,采用GUM法和蒙特卡洛法相结合的方法来评定全年能源消耗效率(APF)的不确定度。由于焓值法数学模型呈现出明显的非线性,首先使用蒙特卡洛法来验证额定制冷量和额定制热量GUM法评定结果, 验证结果显示2种方法偏差不超过2‰。然后,给出了5个工况下换热量的不确定度评定结果,以此作为APF蒙特卡洛模拟的输入量,并给出了自适应蒙特卡洛法评定APF不确定度模拟流程,得到某空调的APF扩展不确定度评定结果为0.09 kW·h/(kW·h)(k=2)。 相似文献
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S. D. Phillips B. Toman W. T. Estler 《Journal of research of the National Institute of Standards and Technology》2008,113(3):143-156
We investigate the influence of finite resolution on measurement uncertainty from the perspective of the Guide to the Expression of Uncertainty in Measurement (GUM). Finite resolution in a measurement that is perturbed by Gaussian noise yields a distribution of results that strongly depends on the location of the true value relative to the resolution increment. We show that there is no simple expression relating the standard deviation of the distribution of measurement results to the associated uncertainty at a specified level of confidence. There is, however, an analytic relation between the mean value and the standard deviation of the measurement distribution. We further investigate the conflict between the GUM and ISO 14253-2 regarding the method of evaluating the standard uncertainty due to finite resolution and show that, on average, the GUM method is superior, but still approximate. 相似文献