Hi Yu,
Lets begin with the excellent description written by Andrew Ingraham:
The voltage sag propagates outward from the chip, consuming charge stored in
the intrinsic capacitance of the planes bit by bit (not all of it at once!),
and eventually reaching external capacitors which help hold
Equipment in air handling space is addressed in the NEC. The basic
requirement is to prevent smoke emissions from equipment located in the air
handling space. UL has Listed some of our ITE for that purpose. Hermetic
sealing was not a requirement, but reasonable practice in sealing cable
openings
Hello Nick,
Singapore PSB has requirements for the mains plug used depending if it is a
2 or 3 pin configuration. My experience with the 3 pin config is it must
comply with Singapore standard SS145 and bear the marking SS145 on the
plug itself.
For the complete skinny:
1.) Download this
Muriel,
Richard is right, by coincidence I received a task to conduct a site
survey where a 25Kvolt line runs approximately 5 feet underneath the ground
floor. I measured the magnetic field from 30Hz to 100KHz with a magnetic
loop antenna and found that at 60Hz the level was 135dBpT. This
Greetings,
I've got a few questions about flickermeters and EN 61000-3-3.
If anyone has experience using and perhaps calibrating
flickermeters, please e-mail or call. I would like to send a
manuscript for a peer review and to answer some questions I
have.
Thanks.
Can anyone point to a requirement for dust-tight/water-tight connectors for
use under a raised floor in a computer room? I believe that City of
Chicago requires dust-tight/water-tight connectors when the area beneath
the raised floor is also used as a plenum (e.g., a return or supply for
Steve,
Thanks a lot for the very nice hierarchy description below.
If there's a 10 mil or less spacing between pwr and gnd planes, the plane cap
is available. The plane cap and the decaps are complementary in whole frequency
range. Plane cap takes care of high end, and decaps cover low
Nick,
I know that AC/DC adapters commonly used with small electronic products
require category certification by an authorized AU/NZ agency, e.g. QAS.
I suspect a battery charger will require the same, but cannot comment on
the applicable standard given your application.
Our adapters are for
Barry,
You're hitting upon one of the basic fundamentals of how radiated emissions
occur.
The situation that Andrew is describing occurs if we design our boards
properly, with a low inductance return path for each current and with proper
impedance matching; then our traces will act more like
Forwarded for Chris... Please respond to Chris and not me. Jim
Reply Separator
Subject:Employment Opportunity - Radio Approvals
Author: chris_mcgo...@3com.com
List-Post: emc-pstc@listserv.ieee.org
Date: 5/16/00 5:04 PM
Dear compliance
It's a while since we've had anything to do with equipment being
shipped to Australia, so I'd like to check up and see if the
situation has changed in the meanwhile.
I've been asked what would be the requirements for shipping a switch
mode battery charger intended for charging batteries in
Gert,
As a relative newcomer to the world of EMC compliance, please allow
me to question your statement below to clear things up in my own mind.
I thought that as a manufacturer, we have the option of EITHER:
a) declaring conformity against an appropriate standard
or
b) preparing a
Illustrious group:
A NEMA-fitted, SO cable is proposed for (optional) North American use on an
ISM product that is CE labeled and, until now, wired to mains by the
customer. Should I alert the owner against use of this combination in EU? Or
is it implicit by use of the NEMA plug and non-HAR
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