No.9（2014）10.Development of industrial computer that countermeasure against noise

Hiroyasu Sano, Ken Sato, Fumio Takahashi, Toshinori Yamashita, Akihiro Tokikawa

  In recent years, the demand for speeding up the data transmission is growing because the volume of data communication for electronic products has been increasing every year. With the speeding up of data transmission, the problem of radiation noise is becoming salient. Therefore, it is an important issue to reduce the noise within the regulated value in the standard applied for the products. It is important to take measures to reduce the radiation noise from the design stage because the possibility of protection measures is limited after finishing of the products. In this study, the target of development has been shifted to the products corresponding to a stricter regulation of VCCI/FCC CLASS B from the regulations CLASS A for the industrial computers for high density and high-speed communication designed and marketed by Sanritz Automation Co., Ltd. Through this study, we pursue to expand the scope of adaptation to the product standard and to accumulate practical design rules for EMC countermeasure.

Keywords
Radiation noise, Near field measurement, Return current

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