Hello Ghery-
Thank you for the information.
To be honest, I'm not all that familiar with the CISPR voting
process but I do recognize that any election with a 1 vote margin must be a
bit contentious. Unless of course you live in Florida where every vote
counts AT LEAST once. There wasn't any "hanging chad" during that CISPR
vote, was there?
But- back to A1:2000: The data you report indicates that the
emission profile will change with the addition of the ferrite clamps. This
is bothersome for (at least) three reasons-
1st: if the ferrite clamp reduces the emissions from a frequency or
two then I can achieve compliance but a customer may experience an
interference problem due to the fact that they do not install the ferrite
clamp at their facility.
2nd: if the ferrite clamp increases emissions from a frequency then
a product that now achieves compliance may have to be redesigned in order to
pass after the DOW.
3rd: since the FCC doesn't presently allow the use of the ferrite
clamps then I have to test each product one more time- this adds cost and
time delay- especially if a failure arises due to this test.
This could be a major headache for people who deliver product to
market in Europe.
Can anyone tell us the driving reason behind this regulation? Was
it to increase repeatability at test sites? Was it to reduce the number of
interference complaints from ITE installations?
Best Regards,
Patrick Conway NCE
StorageTek
EMC Advisory Engineer
303.661.6391
303.661.6717 (FAX)
-----Original Message-----
From: Pettit, Ghery [mailto:ghery.pet...@intel.com]
Sent: Monday, November 18, 2002 10:09 PM
To: Conway, Patrick R; 'emc-p...@majordomo.ieee.org'
Subject: RE:
Patrick,
I performed some A/B comparison measurements several years ago when this was
still working its way through CISPR to aid in the determination of the US
vote. I found that some emissions go down (some by a bunch) and others may
go up when you add the clamps. You will need to re-test products for Europe
as you can't predict what the change will by just by inspection.
BTW, this amendment to CISPR 22 passed by 1 vote. The US voted no as the
clamps were not adequately defined in the proposal.
Ghery Pettit
Intel
-----Original Message-----
From: Conway, Patrick R [mailto:conw...@louisville.stortek.com]
Sent: Monday, November 18, 2002 2:53 PM
To: 'emc-p...@majordomo.ieee.org'
Subject:
All-
I'd like to know if there are any opinions about...
It is my understanding the CISPR 22 A1:2000 will require the
use of "ferrite clamps" during RE tests of table-top equipment.
Has anyone started using these devices during their testing?
Has anyone seen a difference in their test results with the
use of these devices?
Best Regards,
Patrick Conway NCE
StorageTek
EMC Advisory Engineer
303.661.6391
303.661.6717 (FAX)
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