Abstract
The national-standard-class measuring system for the impulse voltage measurements in Japan was developed in 1999, and its performance has been evaluated annually supported by Ministry of Economy, Trade and Industry (METI). The system has participated in the worldwide comparison tests and its good performance has been confirmed. The low voltage calibration system which is the part of the standard measuring system was compared among 4 countries in a different series of international comparison tests, and the domestically-evaluated low uncertainty of the Japanese system was proved to be reliable.In this paper, the details and the results of the international comparison tests on low voltage impulse carried out in 2004 and 2005 are reported.
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