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 invest
...@majordomo.ieee.org
Subject:Re: Harmonics Testing for PCs
I read in !emc-pstc that Lesmeister, Glenn
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 t
I read in !emc-pstc that Lesmeister, Glenn
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 relative limits are. As yo
I read in !emc-pstc that rbus...@es.com wrote (in ) 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 product:
QUOTE
has essentially 6 rack mounted PCs and a cust
Lesmeister, 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
I read in !emc-pstc that rbus...@es.com wrote (in ) 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. As a
>system, the only way it would pass is to have both
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 distrib
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 combinat
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