To the Group,
Amendment A1:2000 to EN 55022:1998 becomes mandatory (has a DOCOPOCOSS
of) August 1, 2003-- see
http://europa.eu.int/eur-lex/en/dat/2002/c_304/
c_30420021207en00020015.pdf
For testing tabletop equipment, note 6 of Figure 10 says "Mains cables,
telephone lines or other connections to auxiliary equipment located
outside the test area" are to "be fitted with ferrite clamps or ferrite
tubes placed on the floor at the point where the cable reaches the
floor". This note also says that "No extension cords shall be used to
mains receptacle."
If we are testing a product with an AC line cord or a "brick" power
supply, it is clear that we need to run the Radiated Emissions test with
a ferrite clamp/tube on the line cord.
But if we are testing a product that uses a "wall wart" direct plug-in
power supply, do we need to bother with the ferrite clamps/tubes?
My interpretation is that we don't, because the AC/DC cord from the wall
wart is not a "mains cable", nor a "connection to auxiliary equipment
located outside the test area".
How do the rest of you interpret this requirement?
Thanks!
John Barnes KS4GL, PE, NCE, ESDC Eng, SM IEEE
dBi Corporation
http://www.dbicorporation.com/
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