We have an immediate need for an expert at solving OTA problems with iPhone
type accessories. Short term (maybe) and ideally local to southern California.
If you are one, or know of one, please contact me off line. I'd be interested
in availability and background.
Scott Douglas
-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of John M
Woodgate
Sent: Monday, April 26, 2010 1:11 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Harmonic Emissions Testing
Products like that are already on the market. But some other
In message FCA549BE3ECF9D4CB8CB8576837EA4890A7259@ZEUS.cetest.local,
ce-test, qualified testing bv - Gert Gremmen g.grem...@cetest.nl
writes
I have personally been involved in measuring
over 40 amps of neutral conductor (@150 Hz) current
in a building stuffed with ITE equipment,
where
Thanks Lauren.
That is what we need. The screws on this product hold on a guard that covers
very slowly moving parts. Lock nuts are used to ensure that they do not shake
lose and the guard does not need to be removed for servicing or replacing parts.
I will look at EN 953.
Best
To David,
At a power factor of 0.5 the power meter just
measures 50% of your assumed power.
(but you meant to say write of course)
I agree that the power utilities always try to rip us
off, but they have more sophisticated means
than denying physics.
I have personally been involved
I am somewhat familiar with this technology. We call it High Frequency
Filtered Pulse Width Modulation. With this technology you can control the
amplitude of the AC mains (commonly used in dimming lights) by controlling the
duty cycle of a switching device at a frequency of tens, hundreds, or
sine wave technology ?
___
_
Ralph McDiarmid | Schneider Electric | Renewable Energies Business |
CANADA | Compliance Engineer
From: John M Woodgate j...@jmwa.demon.co.uk
To:
Hello John,
Electrical devices for lawn and garden maintenance generally fall under the
Machinery Directive. The latest list of harmonized standards for the
Machinery Directive http://eur-lex.eur
pa.eu/LexUriServ/LexUriServ.do?uri=OJ:C:2009:074:0004:0060:en:PDF includes
EN 60335-2-77,
In message
0ed66cd2c9bd0a459d54fb9119a605670168e...@mailserver.lecotc.com,
Kunde, Brian brian_ku...@lecotc.com writes
What other ?practical? furnace control methods are there that would
pass both the Harmonics and flicker emissions requirements?
Theatrical dimmers using sine wave technology
John,
The captive hardware criterion in the new MD does not, I think, have to be
crippling. I've had some exchanges with Ian Fraser in the Commission on this
point. He notes the appropriateness in applying risk assessment as part of the
consideration. In this light, for example, the case
Dear Group
I have a query from a client that wishes to place an appliance on the EU
market which has a small mechanical hazard associated with it. It is battery
powered at 12Vdc, rechargeable battery. There is a mains charger but it does
not connect directly to the appliance.
We have
In an attempt to apply a real application to the topic of harmonic emissions,
lets take the example of a 30-50 amp single phase precision high temperature
furnace in a piece of analytical test equipment (1000ºC). The control
method of choice would be phase control to precisely control the
In message 16641305538561692815456@IMAC8632, Jon Francis
jfran...@voltech.com writes
My understanding (happy to be corrected) of the reasons for harmonic
current control are:
1/ Limiting voltage distortion
2/ Limiting apparent power requirements.
Since transmission and generating capacity is
My understanding was that the harmonics standards were largely driven by the
power utilities and billing.
With a power factor of 0.5 they were only billing 50% of the power consumed.
That examples of large voltage drops on the neutral-ground bus bar in service
panels were exaggerated or anecdotal.
Asked to spread the word from a friend
EMC Simulation Engineer – Grand Rapids, MI
Primary responsibility is to simulate and evaluate electrical systems in order
to proactively reduce the likelihood of electromagnetic interference issues.
Will serve as the EMC technical leader in the
Dear experts,
MIIT has issued proposal for Catalogue of Key Electronic Information
Products Subject to Pollution Control(Catalogue 1) last year.
Does anyone knows when it will take effective?
Thanks.
Regards,
Aboo
-
This message is from the IEEE Product Safety Engineering Society emc-pstc
In message FCA549BE3ECF9D4CB8CB8576837EA4890A7256@ZEUS.cetest.local,
ce-test, qualified testing bv - Gert Gremmen g.grem...@cetest.nl
writes
I do not think that limitation of voltage distortion is the real reason
for harmonic current control.
The electricity supply experts on the IEC
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