Hello,
On the last CISPR meeting Sept.2002, this case of direct plug-in equipmenut
was discussed.
In the current CISPR22/EN55022, to use AC extention cord is inhibited.
But the direct plug-in equipmenut can not use the ferrite clump.
The output of direct plug-in is DC, not AC.
To use ferrite for DC within the EUT is not allowed.
For an amendment, to use AC extention cord to add the ferrite
only for direct plug-in equipmenut is proposed.
Maybe it will be amended so in the near future.
But, I personally think using ferrite cores to the EMI measurement is not
good.
Because, in the real use in the field, the user do not use ferrite cores.
(To use ferrite cores is said to make reproducibility of the official
measurement.)
Masateru Tagami
E-Mail: tag...@jp.fujitsu.com
TEL: 81-44-754-2185, FAX: N/A
From: "John Barnes"
To:
Sent: Wednesday, January 22, 2003 3:06 AM
Subject: EN 55022:1998 +Amendment A1:2000
>
> 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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