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European EMC requirements
Oaklander:
--- Quote from: jfiresto on June 12, 2020, 06:03:13 am ---
--- Quote from: Oaklander on June 11, 2020, 08:47:52 pm ---I remember reading somewhere that if the highest clock speed in the device is under some limit value, no radiated emission measurement is needed....
--- End quote ---
Yes, 9 khz.
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It seems that the limit is a misinterpretation of the EMC directive guide. See comments on that post.
Also, information about the 9 kHz limit can be found nowhere else than the EMC Fast Pass web page.
nuno:
I think I remember seeing 9KHz but for the American regulations...
Anyways, that means 9KHz clock with 100ps raise time is exempt?....
jfiresto:
You are right, Oaklander, and thank you: I had not been paying attention. The EMC Fast Pass web page is not the only one still listing the 9 khz exemption.
I see the lower limit was eliminated with the Radio Equipment Directive (RED) of 2014. See the Guide for the EMCD (Directive 2014/30/EU), section 1.4.2.1 Radio equipment, and change 2 listed in annex 4.
Gyro:
--- Quote from: nuno on June 12, 2020, 07:50:28 am ---I think I remember seeing 9KHz but for the American regulations...
Anyways, that means 9KHz clock with 100ps raise time is exempt?....
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No, unfortunately that would mean that you were radiating at RF (with a 9kHz repetition rate).
nuno:
--- Quote from: Gyro on June 12, 2020, 10:06:35 am ---
--- Quote from: nuno on June 12, 2020, 07:50:28 am ---I think I remember seeing 9KHz but for the American regulations...
Anyways, that means 9KHz clock with 100ps raise time is exempt?....
--- End quote ---
No, unfortunately that would mean that you were radiating at RF (with a 9kHz repetition rate).
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Exactly my point.
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