I read in !emc-pstc that John Barnes wrote (in
<3d74d7d8.3...@iglou.com>) about 'SMPS EMC Emissions' on Tue, 3 Sep
2002:
>I've updated the statement to meet the current international standards
>for information technology equipment (ITE),
Specifically, that EN 61000-3-2 **Class D** needs to be m
Alex,
Are you speaking of radiation directly from a SMPS on a table? If this is
the case, why, yes, you may, ASK for margin, but you may find few vendors
willing to bid to that requirement. Few ITE makers would warrant their own
boards to meet FCC limits outside a cabinet! But a SMPS should neve
Alex,
When I was developing power supplies at my previous employer, I'd
include a statement like this in our Request For Quotation (RFQ):
"The power supply must meet the following limits with 6dB margin
when supplying power to an 10-ohm resistive load:
* FCC Class B (USA).
* CISPR 22-B (Europe)
[mailto:jc...@shore.net]
Sent: Tuesday, September 03, 2002 3:55 AM
To: Alex McNeil; emc-p...@majordomo.ieee.org
Subject: RE: SMPS EMC Emissions
Alex wrote:
"Do you think it is reasonable to specify in my power supply
specification
that the manufacturers SMPS should meet EN55022 Class B
Alex wrote:
"Do you think it is reasonable to specify in my power supply
specification
that the manufacturers SMPS should meet EN55022 Class B -6dB"
Yes. I would ask for 6 dB margin since measurement uncertainty for
a typical conducted measurements system is 5.4 dB. You must also
allow for un
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