fyi
IEC 60950-23 Ed. 1.0 (2005-09)
Information technology equipment - Safety - Part 23: Large
data storage equipment
Regards,
Peter L. Tarver, PE
ptar...@ieee.org
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This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list.Website: http://www.ieee-pses.org
Ken,
Your logic would hold if all of the USB device energy was broadband at the
same level.
Since power supplies typically do not have a flat transfer curve, it may be
resonant to
some of the USB device frequencies. Then you have a low impedance path
straight through
to the power cord.
Regards,
I would suggest that you do need to test at both supply voltages; but more
significantly, your greatest problem is unlikely to be your product but the
host PC. You need to select your host PC very carefully to ensure that it is
compliant, and that it is quiet enough for you to be able to tell wheth
This is a multi-part message in MIME format.
All,
The subject has come up about allowable or excluded revision letters for
equipment or documents using the English alphabet. I understand this is not
strictly an EMC or Safety question but I think it does fall under some form of
compliance.
Mark,
You have already had most of the information you require, but the point that
everybody is making is that if the product falls within Class 1, i.e. operates
at harmonized frequencies with other parameters as defined by the relevant
sub-class and has been tested to the appropriate harmonized
No answer here, I'm just trying to get educated on the premise behind the
original question.
The modification prompting the requirement for conducted emission testing is
the addition a USB device powered from the PC USB host. I assume this
device consumes on the order of 1 Watt of power. The inc
Gentlemen,
I am wondering if someone knows of any other test standards for
UPS's other than the IEC-62040 series?
Regards to all,
Dave Garnier
David Garnier
e GE Health Care
___
David S. Garnier
Senior Technician
It is my opinion that you must test conducted emissions at
both AC input conditions, and archive those test results.
The mechanisms for conducted emissions can vary greatly
whether you're at 110/60 or 230/50. Better test. A good
Power Supply will minimally exhibit that effect, but who
knows i
No argument there. My apology for using the concept of spectrum and frequency
band too loosely. A frequency is harmonized when it is allowed (harmonized)
throughout all of the member countries per the power levels indicated in the
harmonized standard. To confirm that there are no restrictions b
But you will need the Alert Marking (!) if the frequency is not harmonized
throughout the EU or as pointed out earlier if it is only harmonized in
part. You do not need a NB to notify the National Telecommunications
Authorities if it is a non-harmonized frequency. You can do this yourself.
Bob Hel
For the FCC, conducted and radiated emissions have to be performed at 110 V.
EN55022 does not require any particular voltage.
My suggestion would be check do the conducted emissions at 110V, check
them at 230V, but do the radiated at 110V only.
regards
Charlie
> Dear Experts,
> Our prod
Mark
If all the applicable standards are harmonized and you apply them all, you
don't need a NB opinion for Germany or anywhere else.
if you haven't done so already, you can check the complete list at:
http://europa.eu.int/comm/enterprise/ne
approach/standardization/harmstds/reflist/radiotte.html
Dear All,
I am not an emc expert but can definitely say that such multiple testing is a
barrier to trade and will open a can of worms in other countries; imagine
Japan requiring test at 100 Vac 50 and 60 Hz, Taiwan requiring tetsing at 220
V, 60 Hz, Malaysia requiring test at 240 V, 50 Hz and so
Hi All,
I have been writing again and this month's Technical Tidbit on my
website, http://www.dsmith.org , discusses the need to control stray
parasitics in tests to avoid error and wasted troubleshooting time.
Abstract: It is imperative that test variables be controlled to avoid
testing error
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