Hi HarveyH42;
"These guys" is just me.
Actually the reason I don't publish micro designs is it would be illegal for me to sell.
http://www.redrok.com/phrases.txt
|------------------------------------------------------------
|
| FCC or CE Mark testing:
| I make solar trackers but I don't use micros because
| the legal testing costs are quite high, maybe $10,000
| or so. I used to do this testing while I was employed
| by Unisys from about 1980 to 2006. Some of my
| competitors do use micros and they are really taking
| a chance. However, since I'm one of the worlds
| largest manufacturers of solar trackers I just can't
| violate these rules as I would be one of the first to
| get caught if I violate them.
|
| Yes, I have micro designs, but I can only sell these
| designs to people who are OEM manufacturers as they
| are required to undertake the testing anyway.
| It's the law.
|
| An overview:
|
eEngineer - Electrical Engineering, EMI/EMC, RFI
|
eEngineer -- EMI/EMC Frequently Asked Questions (FAQ), Printer Format
|
| These guys do the tests.
|
**broken link removed**
| And others.
|
| Generally you have to satisfy FCC in the US:
|
**broken link removed**
|
| You probably fit into one of these categories.
|
| Personal Computers and Personal Computer Peripherals
| for residential use.
| or
| Other ITE and "Digital Devices".
|
| Both of these are governed by "Part 15 Subpart B,15.107,15.109".
|
**broken link removed**
|
| And in Europe it is CISPR-22 as I recall.
|
| Let me break it down:
| If the basic clock frequency is greater than 9.6kHz you
| will need to be tested to make sure excessive radio
| emission doesn't exist and must be done at a certified
| testing site. The rule of thumb is this testing costs
| about $10,000 if you pass the first time. That cost
| should cover both the FCC and CISPR requirements along
| with submitting the documents.
|
| An example of this is look at the back of your TV remote
| control and there is an FCC sticker. And virtually
| anything else that has a micro in it.
|
| You may need to be tested even if you don't have a micro.
| A digital device is anything that has a frequency greater
| than 9.6kHz and employs fast switching edges, i.e. digital.
| (Otherwise an analog audio amplifiers would need to be
| tested but they don't because there is no fast switching
| going on.) Things that contain switching mode power
| supplies need to be tested.
|
| Actually it is not to difficult to pass with carefully
| designed circuits and packaging.
| 1. RF tight enclosures so the "bad stuff" is contained.
| 2. Or make sure all switching signals are filtered
| with caps or edge limiting resistors.
| 3. Many times 4 layer PC boards can help with all
| signals on the inner layers.
| 4. Keep fast signals near the center of the board
| and not near the edges of the board.
|
| You have to sell a lot of product to justify the
| expense of this testing. This is why I've decided
| to sell circuits that don't require these tests.
|
|------------------------------------------------------------
Duane
--
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