PROBLEM TO BE SOLVED: To automate the noise reducing tuning of an apparatus of performing an EMI noise countermeasure.;SOLUTION: A method of adjusting the EMI noise includes the steps of preparing a plurality of tuning values for a plurality of countermeasure items (clock frequency, power supply voltage, output impedance, emphasis, and slew rate) of the apparatus 1 for performing an EMI noise countermeasure, measuring the EMI noise when the operating apparatus 1 by one of the hybrids of a plurality of countermeasure items and each tuning values by a measuring device 7, comparing this measurements with a noise reference value 6 by a processor 5, changing automatically the above hybrid when the measurements do not suit the noise reference value, performing the above measurement and the comparison again, holding the hybrid at this time when the measurements suit the noise reference value, and setting it in the apparatus 1.;COPYRIGHT: (C)2007,JPO&INPIT
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