Another fix is to run your system components off of a UPS.
Dave Cuthbert
Micron Technology
From: John Woodgate [mailto:j...@jmwa.demon.co.uk]
Sent: Friday, May 23, 2003 12:06 AM
To: emc-p...@majordomo.ieee.org
Subject: Re: harmonics testing
I read in !emc-pstc that Brian Epstein
I read in !emc-pstc that Brian Epstein brian.epst...@veeco.com wrote
(in 41c71af75675d54bb97c2fadcae7f994260...@exchange.di.com) about
'harmonics testing' on Fri, 23 May 2003:
That raises and interesting question. The components are not in a rack or
case, they are tabletop mounted. I would
Engineer
Veeco Instruments
112 Robin Hill Rd
Santa Barbara CA 93117
805-967-2700 x2315
brian.epst...@veeco.com mailto:brian.epst...@veeco.com
From: ssel...@yorkemc.co.uk [mailto:ssel...@yorkemc.co.uk]
Sent: Friday, May 23, 2003 2:08 AM
To: emc-p...@majordomo.ieee.org
Subject: Re: harmonics testing
I read in !emc-pstc that ssel...@yorkemc.co.uk wrote (in E19J8TQ-
000cv7...@anchor-post-31.mail.demon.net) about 'harmonics testing' on
Fri, 23 May 2003:
Brian/John
I notice that EN61000-3-2(2000) para 6.3 says Where individual
self contained items are installed in a rack or case, they are
Brian/John
I notice that EN61000-3-2(2000) para 6.3 says Where individual
self contained items are installed in a rack or case, they are
regarded as being individually connected to the mains supply. The
rack or case need not be tested as a whole. So, is it a rackfull of
systems, or a system
I read in !emc-pstc that Brian Epstein brian.epst...@veeco.com wrote
(in 41c71af75675d54bb97c2fadcae7f994260...@exchange.di.com) about
'harmonics testing' on Thu, 22 May 2003:
We make a product that has several components that plug into the power mains
including a computer, two monitors, and two
Rick:
Sounds like the harmonics are adding or canceling as the case may be. Check
to see if the offending harmonics are triplen or other harmonics. The high
harmonics are sometimes tricky in the way they behave. Harmonics are always
a function of the AC supply impedance. I would suspect
I read in !emc-pstc that Lesmeister, Glenn glenn.lesmeis...@hp.com
wrote (in 31891b757c09184bbfec5275f85d559502d1d...@cceexc18.americas.cp
qcorp.net) about 'Harmonics Testing for PCs' on Thu, 20 Feb 2003:
The problem with class A limits is that the higher your power draw, the lower
your
I read in !emc-pstc that rbus...@es.com wrote (in B47A89AEC4538744B9D94
bad7e78efc7458...@torino.corp.es.com) about 'Harmonics Testing for PCs'
on Thu, 20 Feb 2003:
As for the limits, we are using A. I understand that D is used
exclusively for ITE and has tighter limits.
You said that the
, Glenn; emc-p...@ieee.org
Subject:RE: Harmonics Testing for PCs
The PDU (power distribution network) provides 4-5 outlets per phase. We
try to balance based on current loads rather than qty of cords. The
graphics processor draws significantly more current per cord than the
PCs
I read in !emc-pstc that rbus...@es.com wrote (in B47A89AEC4538744B9D94
bad7e78efc7454...@torino.corp.es.com) about 'Harmonics Testing for PCs'
on Thu, 20 Feb 2003:
During the Harmonics test (EN 61000-3-2) the system failed harmonics.
Testing all of the peripherals individually, they all passed.
and has tighter limits.
From: Lesmeister, Glenn [mailto:glenn.lesmeis...@hp.com]
Sent: Thursday, February 20, 2003 3:23 PM
To: Rick Busche; emc-p...@ieee.org
Subject: RE: Harmonics Testing for PCs
Rick,
You don't indicate how all of the other components are wired in the
power distribution
Rick,
You don't indicate how all of the other components are wired in the power
distribution system. If you are balancing all load on the 3 phases, but only
have 2 cords for the graphics controller, you must have something else picking
up the slack on the 3rd phase. Are there any other
PM
To: cet...@cetest.nl
Cc: emc-p...@majordomo.ieee.org
Subject: RE: Harmonics Testing
Gert,
Does this imply that the current revision will be withdrawn before it
becomes mandatory for CE-marking? If so, how does this affect CE-Marking
requirements in the 1-1-2001 to 1-1-2003 timeframe? Can you
Hello from San Diego:
Classifying products according to EN 61000-3-2 is
not straight-forward.
A product with the special waveshape (i.e., the
waveshape created by a rectifier-capacitor circuit
of a switching-mode or linear power supply) is
Class D.
A product with input current waveform
Actually I had the same question as what Randy raised hear. I felt confused
when trying to classify my EUT below 50W input power as Class A or Class D.
Thanks for the clarification made by Gert. I was wondering why I could not have
found the answer in Fig. 2 Flow-chart for classification of
month UAP
procedure:
acceptance 7 or 8/2000 Publication OJEC winter 2001. Transaction time
probably 2 years.
Regards
Gert Gremmen
-Original Message-
From: rehel...@mmm.com [mailto:rehel...@mmm.com]
Sent: Wednesday, January 19, 2000 11:32 AM
To: cetest
Subject: RE: Harmonics Testing
'emc-pstc' emc-p...@majordomo.ieee.org
cc:(bcc: Robert E. Heller/US-Corporate/3M/US)
Subject: RE: Harmonics Testing
I suppose Randy you are concerned about the EN-61000-3-2 instead of the
EN 61000-3-3 which is concerned with Flicker testing.
Please Note that the 3-2 is currently under
Gert,
Is 3-2 applicable to power supplies of 50W in Jan 1, 2001 ?
Or is it still 75W in Jan 1, 2001, then 4 years later changed to 50W ?
thanks
Bruce
cetest wrote:
I suppose Randy you are concerned about the EN-61000-3-2 instead of the
EN 61000-3-3 which is concerned with Flicker testing.
Randall,
First, the standard is IEC (or EN) 61000-3-2, not -3. Article 5 defines
Class D products as those Equipment having an input current with a special
wave shape as defined in figure 1 and an active input power, P= 600 W,
measured under the test conditions given in the relevant clause of
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