共查询到19条相似文献,搜索用时 640 毫秒
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本文介绍了交流约瑟夫森电压标准系统的性能。该系统是一种新型的交流量子电压计量装置,用于校准常用的直流和交流电压标准。通过测试几个福禄克5700A系列校准器,其电压为10V,频率是1k Hz了解到该系统在工业环境中的性能和操作方法。交流电压标准的测量不确定度小于1×10-6 相似文献
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不同国家的六个计量实验室用齐纳二极管作为传递电压标准进行了电压标准的国际。比对结果在测量不确定度内是吻合的,它仅受齐纳稳定性的限制。对于1.108V的输出而言,数据与线性回归拟合具有0.047μV的残余标准偏差。从而有可能据此证实西班牙TPYCEA新1V约瑟夫森电压标准的性能。 相似文献
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基于约瑟夫森量子电压标准设计了交流功率差分测量系统。通过分析差分采样系统的误差分布及误差传递函数,提出换向差分测量方法,减小了差分采样系统的增益误差,提高了电压幅值测量准确度;通过分析衰减系数η,证明了采用换向差分测量较容易实现10-7量级电压幅值测量。通过评估差分采样系统零相位,结果证明了差分采样系统具有较好的相位测量稳定性。分析了交流功率差分测量系统的不确定度分量,评估了功率因数为1.0,0.5 L和0.5 C时的功率测量不确定度,通过与国家交流功率基准装置进行实验比对,证明了基于约瑟夫森量子电压交流功率测量系统不确定度评估的合理性。 相似文献
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为建立国家法定电压基准,中国计量科学研究院(NIM)对1-V和10-V约瑟夫森串联结阵电压标准进行了研究。其中结阵分别是由德国的PTB,日本的ETL,美国的NIST和韩国的KRISS提供的。采用的微波源是一个锁定到10MH_z频率标准上的高稳定高功率的85GH_z的G_aA_s耿氏管振荡器。所获得的1_v和10-V电压的总不确定度分别是9E-9和6E-9。 相似文献
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本刊讯日前,由中国计量科学研究院牵头承担完成的"十一五"国家科技支撑计划项目课题"高压电能计量标准及量值溯源关键技术研究"顺利通过国家质检总局组织的专家验收。课题组在国际上首次建立了10kV、35kV、110kV高压电能计量标准装置及现场校准装置, 相似文献
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AC power & energy standard of National Physical Laboratory, India (NPLI) is responsible for maintenance of national measurement
standard of ac power & energy and international traceability through intercomparisons. It serves as the basis for dissemination
of traceability in measurement through high level calibration and measurement services to the various user organizations in
the country. It also supports and helps the industries in improving the measurement assurance systems through interlaboratory
proficiency testing (PT) program and in solving actual field problems. Power measurement at zero power factors using zero
power factor standards is described as it is used in intercomparison. The performance of energy meters under the various influence
quantities is described as a service to the industries. 相似文献
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Measurement Techniques - A conceptual approach to the traceability of measurements of the energy (power) of laser beams during calibration of means of measurement to standards is formulated,... 相似文献
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《Engineering Science and Education Journal》1997,6(1):9-16
Reliable measurement underpins most of the activities of mankind, including manufacturing, service industries and the health service. For example, measuring instruments are used throughout manufacturing processes to ensure the quality of the product is satisfactory. It is essential for international trade that all measuring instruments throughout the world should be based on a compatible system of measurement; this is achieved by calibration and traceability. Traceability is the process by which measurements are related through an approved chain of comparisons to national and international standards. This paper describes the techniques used in the assessment of electrical measurement laboratories so as to provide assurances that the chain of measurement traceability is unbroken 相似文献
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G. P. Eppeldauer 《Mapan》2009,24(3):193-202
In detector output-signal measurements, where the measurement uncertainty critically impacts the total uncertainty of a detector-based
radiometric scale realization, traceability of the photocurrent measurement to SI traceable electrical standards is needed.
A reference photocurrent-to-voltage conversion scale has been developed and described here. The new standard has internal
reference resistors for all signal-gain selections to decrease noise pickup of traditionally used external reference resistors.
The internal resistors were calibrated by the NIST Quantum Electrical Metrology Division against standard resistors. Using
the substitution method, the reference photocurrent-to-voltage conversion scale was transferred from the converter standard
to other converters up to a maximum signal-gain of 1010 V/A with an expanded uncertainty of 0.013% (k=2). The DC conversion scale was extended to AC mode signal-gain calibrations
where the photocurrent measurement uncertainty is 0.05% (k-2). 相似文献