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For lighting product, EN55015 will be used for the emission measurements. In this standard, only QP data is necessary for the radiation test. According to your uploaded figures, your lab seems taking the data with the Peak detector at a 3m site. If that is the case, the reading is most likely higher than the QP values. Perhaps, you have better checking with your lab about this. Or, you may also consider hire another reliable lab for double checking.
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$ S; E+ g0 z( GAbout the limit, the standard defines for the 10m site. If your lab uses the 3m site, the limit should adjust with the correction factor 10.5dB. Hence, I think the upper line on your figure is the limit line for his 3m data.
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For the EMC modification, you may consider to add the Ni-Zn ferrite core onto your internal wires if you do not want to modify your circuit and PCB layout. Normally, 3 to 4 turns wound on the ferrite core will work for your failed frequency. |
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发表于 2010-9-16 16:17
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