Vol.3 No.3 2010

Research paper−214−Synthesiology - English edition Vol.3 No.3 pp.214-223 (Dec. 2010) of measurement traceability and the compatibility to international standard for the testing device in their manufacture line are pressing issues.To respond to the demands of the Japanese industry, the National Institute of Advanced Industrial Science and Technology (AIST) is developing the national standards of various electric quantities such as voltage and resistance, establishing these as standards with international compatibility through international comparisons, and is building a system for widely disseminating the metrology standards to the site of production of the Japanese industries through the Japanese calibration laboratories. The quantities of impedance such as capacitance, inductance, and AC resistance are the most fundamental physical quantities among many electric quantities. However, with the enhanced performance of electronic devices as well as the improved performance and increased electronic parts in automobiles, the demand for highly precise standards, particularly for capacitors, has risen in the last ten years. Therefore, the standard setting and realization of the capacitor or the capacitance standard were reviewed starting from zero, and R&D was conducted to establish a new capacitance standard and to build the metrological traceability system.By disseminating the world’s highest electrical standards, including the capacitance standard to the Japanese electronic parts companies, the metrological traceability can be guaranteed for every electronic part. We wish to support the global competition and the technological development of the Japanese electronic parts industry as well as the Japanese core industries such as electrical, communication, and automobile industries that are the destination of these 1 IntroductionThe manufacturing industry for electronic parts and modules including the laminated ceramic capacitor, chip inductor, EMI filter, and thin-film resistor element is one of the major industries in Japan. For example, capacitor alone has estimated market scale of 800 billion to one trillion yen. The demand for capacitors is increasing due to the increased and diversified performance of the digital home appliances such as the flat panel television, cell phones, and personal computers, as well as increased use of electronic elements in automobiles. Moreover, there is a high expectation for high-volume battery capacitor as the next-generation energy device, and further demands are expected in the environment and energy fields[1]. Currently, the global share of Japanese electronic parts industry for capacitors is estimated at about 70 %, but the shares of other Asian electrical companies are rapidly increasing.The main customers of the electronic parts companies, or the main supply destination of the electronic parts, are the major manufacturers of automobile, electrical appliance, or communication device industries. These industries are demanding increased reliability of electronic parts and modules from the perspective of safety, security, and energy saving. At the same time, there is a strong demand for compatibility with the international standards such as the ISO/TS 16949 (international standard for the quality management system of the automobile industry) and ISO/IEC 17025 (international standard for the capability of the testing and calibration laboratories). The establishment of metrological traceability to the national standard is mandatory. For the Japanese electronic parts companies, to meet the demands of their customers, the establishment - Realization of a new capacitance standard and its traceability system -Yasuhiro Nakamura* and Atsushi DomaeNational Metrology Institute of Japan, AIST Tsukuba Central 3, 1-1-1 Umezono, Tsukuba 305-8563, Japan (current affiliation: Planning Headquarters, AIST Tokyo Headquarters, 1-3-1 Kasumigaseki, Chiyoda-Ku, Tokyo 100-8921, Japan) *E-mail : Original manuscript received January 28, 2010, Revisions received July 12, 2010, Accepted July 14, 2010 A capacitor or a condenser is one of the most basic electrical devices and is used in various electrical equipments. Recently the electrical equipment industry has been requesting the quality of capacitors to be compatible with international standards; among other things, it is strongly demanded that the traceability of a capacitance standard should be consistent with the national standards. To respond to this need from industry, we have developed a new national standard of capacitance based on the quantized Hall resistance and also established its traceability system in cooperation with the accredited calibration businesses. A remote calibration system of capacitance has also been developed to disseminate the standard quickly and to reduce calibration costs.National electrical standards supporting international competition of Japanese manufacturing industriesKeywords : Capacitance, condenser, electrical standard, traceability, remote calibration[Translation from Synthesiology, Vol.3, No.3, p.213-222 (2010)]


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