McDowell
Sent: Tuesday, November 30, 2010 3:28 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Camera to take pictures of 30MHz to 1000MHz Electromagnetic-Spectrum
emissions
Because it never hurts to ask, any leads on where to buy a device that will
allow me to look at a PCBA and see the 30MHz
In message 9c9789c7-a289-48d9-89cb-155ab701a...@emc-seminars.com,
dated Wed, 1 Dec 2010, Ken Wyatt k...@emc-seminars.com writes:
Looks like this might be it...ferrofluid film. I suspect it would
require a rather large magnetic field to show anything, but I'll order
a sheet and report the
Looks like this might be it...ferrofluid film. I suspect it would require a
rather large magnetic field to show anything, but I'll order a sheet and
report the results.
http://www.amazon.com/gp/product/handle-buy-box/ref=dp_start-bbf_1_glance
Ken
___
Kenneth Wyatt
Wyatt Technical
In message
64f94c18f6d40243bcf3fc0a8a4bda794153d50...@mshq11.thoratec.com, dated
Wed, 1 Dec 2010, Bryce Stammerjohan bstammerjo...@thoratec.com writes:
Yep, you can buy that sheet material on Amazon, etc. at a reasonable
price.
How to find it on Amazon without a 90 day search?
--
OOO - Own
, David H [mailto:david.spen...@xerox.com]
Sent: Tuesday, November 30, 2010 7:42 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Camera to take pictures of 30MHz to 1000MHz
Electromagnetic-Spectrum emissions
As I recall, at an IEEE EMC symposium several years ago (12?) there was a
demonstration
Ohh, I'm so disappointed!! :-)
___
Kenneth Wyatt
Wyatt Technical Services LLC
Woodland Park, CO
k...@emc-seminars.com
www.emc-seminars.com
On Dec 1, 2010, at 1:09 AM, John Davies, Blackwood Labs wrote:
The EMC Goggles that I offer are not tangible.
-
@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Camera to take pictures of 30MHz to 1000MHz
Electromagnetic-Spectrum emissions
I think one of the Brit's have developed some sort of EMC goggles.
He teaches a course on how to use them!
Bill
In the event of a national emergency,
click on the following
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: Camera to take pictures of 30MHz to 1000MHz
Electromagnetic-Spectrum emissions
There are a number of flatbed EMC scanners on the market. This is another
that I am familiar with.
http://www.detectus.se/products_emc.html
It’s nothing more than
david.spen...@xerox.com
Subject: RE: Camera to take pictures of 30MHz to 1000MHz
Electromagnetic-Spectrum emissions
To: Chuck McDowell chu...@meyersound.com, EMC-PSTC@LISTSERV.IEEE.ORG
Date: Tuesday, November 30, 2010, 10:41 PM
As I recall, at an IEEE
As I recall, at an IEEE EMC symposium several years ago (12?) there was a
demonstration of just such a system.
A special film was placed over the DUT and a video camera is used to view the
electomagnetic emissions.
Regards,
David Spencer
-Original Message-
From: emc-p...@ieee.org
the
coupling paths or the transmitting antennae.
From: Marko Radojicic [mailto:radojic...@yahoo.com]
Sent: Tuesday, November 30, 2010 4:23 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: Camera to take pictures of 30MHz to 1000MHz
Electromagnetic-Spectrum emissions
You can also try
To: EMC-PSTC@LISTSERV.IEEE.ORG
Sent: Tue, November 30, 2010 3:38:49 PM
Subject: Re: [PSES] Camera to take pictures of 30MHz to 1000MHz
Electromagnetic-Spectrum emissions
I’ve tried beer goggles with little useful effect – well not useful for EMC
anyway.
I don’t think you’ll have a camera
seen anyone buy one.
From: Chuck McDowell [mailto:chu...@meyersound.com]
Sent: Tuesday, November 30, 2010 3:28 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Camera to take pictures of 30MHz to 1000MHz
Electromagnetic-Spectrum emissions
Because it never
Because it never hurts to ask, any leads on where to buy a device that will
allow me to look at a PCBA and see the 30MHz to 1000MHz
Electromagnetic-Spectrum emissions like a photograph?
Signed Stumped in Berkeley Ca.
Chuck McDowell
Meyer Sound Laboratories Inc.
NOTICE: This email
. The equipment is a portable hand held device, battery powered
and would only be in the area for several hours. Are there exceptions
for a device like this regarding emissions classification? I didn?t
find anything in the Directive, EN 61326-1 or CISPR11 except the
excerpt above.
You won't find
in a
residential neighborhood at the demarcation point. The equipment is a
portable hand held device, battery powered and would only be in the area for
several hours. Are there exceptions for a device like this regarding
emissions classification? I didn’t find anything in the Directive, EN
61326-1
From: Bill Owsley [mailto:wdows...@yahoo.com]
Sent: 29 October 2010 23:26
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Different Radiated Emissions results at different labs
*** WARNING *** This message has originated outside your organisation, either
from an external partner
: Different Radiated Emissions results at different labs
To: emcp...@sulisconsultants.com, EMC-PSTC@LISTSERV.IEEE.ORG
Date: Friday, October 29, 2010, 10:33 AM
HI Charlie,
you point out one of the problems in EMI testing that always plagued
to the test software, EUT set up and the
operators technique.
Sincerely,
Derek Walton
L F Research
-Original Message-
From: Charlie Blackham emcp...@sulisconsultants.com
To: EMC-PSTC@LISTSERV.IEEE.ORG
Sent: Fri, Oct 29, 2010 2:04 am
Subject: Different Radiated Emissions results at different
Some products are very sensitive to interconnecting cable placement. I don't
know of many labs that actually go through cable manipulation at each
frequency being measured, along with rotating the product and scanning the
antenna height, to make sure the emissions measured are truly maximized. I
In message
B5113F712514D611BC3C00D0B76954220122312F@cw-server.complianceworld,
dated Fri, 29 Oct 2010, Larry Stillings la...@complianceworldwide.com
writes:
I have seen products leave the lab and come back and have the same
profile within 1 dB or less.
It's reasonable to think that the
Emissions results at different labs
Quite often I see 4-5 dB variation on the same EUT and on the same lab.
Day 1: Make measurement. Take down the test setup.
Day 2: New measurement. Same EUT. Tries to recapitulate the test setup with
same EUT position on the table and cables
Seen as much as 12 dB at test labs which have performed site testing with
less than 0.5dB variation between them.
1.8dB was traced to spectral regions using conservative antenna factor
table, and part [at least to my thinking] was caused by the choice of GND
plane which interacts with the
Fra: Charlie Blackham [mailto:emcp...@sulisconsultants.com]
Sendt: 29. oktober 2010 09:04
Til: EMC-PSTC@LISTSERV.IEEE.ORG
Emne: [PSES] Different Radiated Emissions results at different labs
Group
Testing a product to CISPR11 class B and seeing quite a difference in results
below 1 GHz when
In message 00f201cb7737$825fe3a0$871faae0$@com, dated Fri, 29 Oct
2010, Charlie Blackham emcp...@sulisconsultants.com writes:
Testing a product to CISPR11 class B and seeing quite a difference in
results below 1 GHz when tested at two different labs.
How much is 'quite a difference'? It's
Group
Testing a product to CISPR11 class B and seeing quite a difference in results
below 1 GHz when tested at two different labs.
I don’t wish to discuss why this is being done, but would be very grateful
for any Quantitative data people have on differences between different OATS or
broadcast service, then one
microsecond bursts are usually invisible. Using a Peak detector will indicate
more trouble than really exists, so detectors like Quasi-Peak and Average
attempt to assess the real interfering ability of low duty cycle emissions to
these services.
Quasi-Peak is tailored
g.grem...@cetest.nl
Subject: RE: Radiated Emissions Detector Rationale of EN 301 489
To: Tony T ton...@europe.com, EMC-PSTC@LISTSERV.IEEE.ORG
Date: Wednesday, September 29, 2010, 8:59 AM
Not only this standard uses peak AND average
detectors
Verzonden: Wednesday, September 29, 2010 12:56 PM
Aan: EMC-PSTC@LISTSERV.IEEE.ORG
Onderwerp: Radiated Emissions Detector Rationale of EN 301 489
Hopefully someone can help.
EN 301 489 series of EMC standards for wireless products requires measurements
using different detectors as follows:
30
Hopefully someone can help.
EN 301 489 series of EMC standards for wireless products requires measurements
using different detectors as follows:
30 MHz to 1 GHz using Quasi Peak Detector (IAW EN 55022:2006)
Above 1 GHz using Peak and Average Detectors
Could someone explain
a) Why
In message 8044d570-ce2b-4dcb-a578-2e7efaa6d...@emc-seminars.com,
dated Mon, 9 Aug 2010, Ken Wyatt k...@emc-seminars.com writes:
Please don't be confused. You're reading the standard correctly. I
don't believe there is any push from the CISPR WGs to extend beyond 1
GHz any time soon. One
, Ken
___
Kenneth Wyatt
Wyatt Technical Services LLC
Woodland Park, CO
k...@emc-seminars.com
www.emc-seminars.com
On Aug 9, 2010, at 3:07 PM, Kunde, Brian wrote:
Please confirm or educate me about CISPR 11 (and EN55011) having no
radiated
emissions requirements
Please confirm or educate me about CISPR 11 (and EN55011) having no radiated
emissions requirements above 1Ghz on Group 1 ISM equipment? I thought the
requirements for testing above 1Ghz for ISM would follow the CISPR 22
requirements. Are there plans to include this testing in the future for ISM
The IEC (SC77AWG1) is investigating whether any ill-effects are being
observed due to conducted emissions on the mains supply between the
frequencies of 2 kHz (2.4 kHz in 60 Hz systems) and 9 kHz. The voltage
levels at these frequencies are known to be rising as more switching
circuits
-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
. But some other products
don't have an economic technology that eliminates harmonic emissions.
--
This is my travelling signature, adding no superfluous mass.
John M Woodgate
-
This message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list. To post a message to the list
...@ieee.org] Namens Spencer, David H
Verzonden: maandag 26 april 2010 13:31
Aan: EMC-PSTC@LISTSERV.IEEE.ORG
Onderwerp: RE: [PSES] Harmonic Emissions Testing
My understanding was that the harmonics standards were largely driven by the
power utilities and billing.
With a power factor of 0.5
, or
thousands of times per second.
It is much more complex than phase control but if done right very low harmonic
emissions. Downsides are the large filters required to smooth the wave shape
and filter out the switching emissions. It also takes up a lot more room than
an SSR.
High power light
@LISTSERV.IEEE.ORG
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List-Post: emc-pstc@listserv.ieee.org
List-Post: emc-pstc@listserv.ieee.org
Date: 04/26/2010 09:57 AM
Subject:Re: [PSES] Harmonic Emissions Testing
In message
0ed66cd2c9bd0a459d54fb9119a605670168e
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
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
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.
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
-PSTC@LISTSERV.IEEE.ORG
Conversation: [PSES] Harmonic Emissions Testing
Subject: RE: [PSES] Harmonic Emissions Testing
Thanks John,
It was my understanding that if there is no logical
explanation for a set of standards rules, it's history,
compromise, or commercial interests. ;)))
I do
; EMC-PSTC@LISTSERV.IEEE.ORG
Onderwerp: Re: [PSES] Harmonic Emissions Testing
In message FCA549BE3ECF9D4CB8CB8576837EA4890A7255@ZEUS.cetest.local,
ce-test, qualified testing bv - Gert Gremmen g.grem...@cetest.nl
writes
The reasons to limit harmonic currents are not all emc-related,
and mostly
: Sun, 25 Apr 2010 12:12:51 +0100
To: ce-test, qualified testing bv - Gert Gremmen g.grem...@cetest.nl
Cc: Ken Javor ken.ja...@emccompliance.com, EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Harmonic Emissions Testing
In message FCA549BE3ECF9D4CB8CB8576837EA4890A7255@ZEUS.cetest.local,
ce-test
In message FCA549BE3ECF9D4CB8CB8576837EA4890A7255@ZEUS.cetest.local,
ce-test, qualified testing bv - Gert Gremmen g.grem...@cetest.nl
writes
The reasons to limit harmonic currents are not all emc-related,
and mostly power distribution related:
That is regarded as an EMC matter.
The issue of
, think about the environment.
Van: emc-p...@ieee.org [mailto:emc-p...@ieee.org] Namens Ken Javor
Verzonden: Friday, April 23, 2010 4:23 PM
Aan: EMC-PSTC@LISTSERV.IEEE.ORG
Onderwerp: Re: [PSES] Harmonic Emissions Testing
I don’t understand all the terminology, but from a technical point
the harmonic current in reference to
the overall load?
No: the goal is to limit *voltage distortion*. But there are BIG
problems with measuring voltage distortion for individual products, so
current is measured.
Does a higher fundamental load make the affects of harmonic emissions
less of a problem
To: EMC-PSTC@LISTSERV.IEEE.ORG
Conversation: [PSES] Harmonic Emissions Testing
Subject: RE: [PSES] Harmonic Emissions Testing
Thanks to all who replied to my earlier email.
It would help me understand the intent of the harmonic standards if I knew
what the goal of these standards were
fundamental load make the affects of harmonic emissions less of a
problem on a public low-voltage ac distribution system?
Several replies have suggested we test the instrument in different current
load modes. Here is the problem with that.
Let’s say we have an instrument that under full load draws 2
@LISTSERV.IEEE.ORG
List-Post: emc-pstc@listserv.ieee.org
List-Post: emc-pstc@listserv.ieee.org
List-Post: emc-pstc@listserv.ieee.org
Date: 04/22/2010 12:40 AM
Subject:Re: [PSES] Harmonic Emissions Testing
In message
0ed66cd2c9bd0a459d54fb9119a605670168d
In message
0ed66cd2c9bd0a459d54fb9119a605670168d...@mailserver.lecotc.com, dated
Wed, 21 Apr 2010, Kunde, Brian brian_ku...@lecotc.com writes:
If an instrument could operate in different modes at different current
levels, what do you use as the Reference Fundamental Current in the
61000-3-12
Emissions Testing
Subject: Harmonic Emissions Testing
I am a newbie to Harmonic Emissions Testing. It is my understanding that the
61000-3-2 standard has hard harmonic current limits (2.3 amps 3rd harmonic for
Class A) but the 61000-3-12 (2006 version) limits are a percentage of harmonic
current
I am a newbie to Harmonic Emissions Testing. It is my understanding that the
61000-3-2 standard has hard harmonic current limits (2.3 amps 3rd harmonic for
Class A) but the 61000-3-12 (2006 version) limits are a percentage of harmonic
current referenced from the fundamental current.
My
for Conducted Emissions, however depending on
the HP rating of the motors on the device, sometime the limits are relaxed. I
believe currently only Toys fall under the Radiated Emissions requirements,
otherwise you only perform Disturbance measurement on the power and I/O cables
from 30 to 300 MHz
, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336 Fax:
651-778-6252
==
From:
Doug Kramer dkra...@nceelabs.com
To:
emc-p...@ieee.org emc-p...@ieee.org
Date:
03/25/2010 08:57 AM
Subject:
RE: EU emissions standard for commercial
The only comment when testing to EN 55014-1 is you have to meet very similar
requirements to Class B for Conducted Emissions, however depending on the HP
rating of the motors on the device, sometime the limits are relaxed. I believe
currently only Toys fall under the Radiated Emissions
, 2010 2:15 AM
To: emc-p...@ieee.org
Subject: Re: EU emissions standard for commercial kitchen equipment?
In message 6.1.0.6.2.20100325001219.0410e...@pop.randolph-telecom.com,
dated Thu, 25 Mar 2010, Joe Randolph j...@randolph-telecom.com writes:
Is there a more appropriate emissions standard
In message 6.1.0.6.2.20100325001219.0410e...@pop.randolph-telecom.com,
dated Thu, 25 Mar 2010, Joe Randolph j...@randolph-telecom.com writes:
Is there a more appropriate emissions standard for commercial kitchen
equipment? If so, does that standard use Class A limits?
Not really. A commercial
that is not intended for household use. His test lab has proposed testing the
product to EN 55014-1, which appears to be targeted at household appliances
and uses the Class B emission limits.
Is there a more appropriate emissions standard for commercial kitchen
equipment? If so, does that standard
at household appliances
and uses the Class B emission limits.
Is there a more appropriate emissions standard for commercial kitchen
equipment? If so, does that standard use Class A limits?
Any insight would be appreciated.
Joe Randolph
Telecom Design Consultant
Randolph Telecom, Inc.
781-721-2848 (USA
Date: 03/12/2010 12:49 AM
Subject:Re: [PSES] Conducted emissions with floating neutral
John:
I see several considerations here. First when you 'float' the neutral are you
running on batteries or do you have a ground fault that continues to supply
) exceed Part 15 Class A limits by about 10 dB. However, when we
float the power by “un-grounding” the neutral, the emissions drop
approximately 15 – 20 dB into passing territory. This happens at 110 and 220
V.
Using a discrete inlet filter has little to no effect. What am I
I currently have an issue where we have a 100 – 240 VAC power supply
designed by a third-party where we see harmonics of the switching frequencies
(~ 200 kHz) exceed Part 15 Class A limits by about 10 dB. However, when we
float the power by “un-grounding” the neutral, the emissions drop
http://www.senate.gov/general/contact_information/senators_cfm.cfm
From: Ken Javor ken.ja...@emccompliance.com
To: Untitled emc-p...@ieee.org
Sent: Sat, December 19, 2009 12:13:27 PM
Subject: Re: [PSES] Emissions (now the STS O-ring debate)
I’m not a rocket
OTOH, I think it was a good thread.
Regards,
Glyn Garside
--- Original Message
Subject: Re: [PSES] Emissions (now the STS O-ring debate)
From: John Woodgate j...@jmwa.demon.co.uk
List-Post: emc-pstc@listserv.ieee.org
List-Post: emc-pstc@listserv.ieee.org
List-Post: emc-pstc
by the desire to
spread the work around. (I don't have a source for this. Maybe there were other
reasons for building it a long way from the Cape.)
Regards,
Glyn Garside
Original Message
Subject: Re: [PSES] Emissions (now the STS O-ring debate)
From
To: IEEE EMC SAFETY PSTC
Subject: Emissions from Computer power supplies - update
A few days ago I appealed for a compliant computer power supply. Since
that time my client accumulated many models ( 15 ) that fitted their
needs and we tested them all. The spread is horrific. Over 60 dB and
some
In message 4b2d36c7.2...@iglou.com, dated Sat, 19 Dec 2009, John
Barnes jrbar...@iglou.com writes:
You may want to read the book No Downlink: A Dramatic Narrative About
the Challenger Accident and Our Time, by Claus Jensen and Barbara
Haveland. Political considerations were behind many of
Ed,
You may want to read the book No Downlink: A Dramatic Narrative About
the Challenger Accident and Our Time, by Claus Jensen and Barbara
Haveland. Political considerations were behind many of the (in
hindsight) questionable/stupid design and operational decisions that led
to the Challenger
To: emc-p...@ieee.org
Conversation: [PSES] Emissions (now the STS O-ring debate)
Subject: RE: [PSES] Emissions (now the STS O-ring debate)
While it was fascinating to learn of the compromises and bad assumptions that
led to this disaster, I think you can say that the players were locked
-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Emissions from Computer power supplies - update
Wikipedia:
Roger Boisjoly, the engineer who had warned about the effect of cold
weather on the O-rings, left his job at Morton Thiokol and became a
speaker on workplace ethics.[46] He argues
In message 002301ca8033$a4b25b00$d600a...@tamuracorp.com, dated Fri,
18 Dec 2009, Brian O'Connell oconne...@tamuracorp.com writes:
With much respect to Mr Javor, I do not believe in a systemic
problem. Sometime, somewhere, there was a singular decision to take a
risk, or deny that there is a
: RE: [PSES] Emissions from Computer power supplies
Some of these threads cause me to meta-think.
I have just looked at some trend lines slowly creep across the monitor that
represent several parameters of a box that is running under an abnormal
operating condition. I come back to the test
.
Sometime, somewhere, there was a singular decision to take a risk, or deny
that there is a significant risk.
R/S,
Brian
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Ken Javor
Sent: Friday, December 18, 2009 12:24 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Emissions
Wikipedia:
Roger Boisjoly, the engineer who had warned about the effect of cold weather
on the O-rings, left his job at Morton Thiokol and became a speaker on
workplace ethics.[46] He argues that the caucus called by Morton Thiokol
managers, which resulted in a recommendation to launch,
From: ralph.mcdiar...@ca.schneider-electric.com
List-Post: emc-pstc@listserv.ieee.org
List-Post: emc-pstc@listserv.ieee.org
List-Post: emc-pstc@listserv.ieee.org
Date: Fri, 18 Dec 2009 11:02:54 -0800
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Emissions from
In message 001401ca8016$669f9250$d600a...@tamuracorp.com, dated Fri,
18 Dec 2009, Brian O'Connell oconne...@tamuracorp.com writes:
A root cause of the o-ring debacle was not simply the complicity by
concerned parties, but that federal and corporate interests chose to
ignore the immutability of
: Friday, December 18, 2009 2:40 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [***] Re: [PSES] Emissions from Computer power supplies -
update
In message
OF5511FBF6.56DDB639-ON88257690.0067E192-88257690.00685348@US.Schneider-
E
lectric.com, dated Fri, 18 Dec 2009,
ralph.mcdiar...@ca.schneider
- 703-880-4841
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of John
Woodgate
Sent: Friday, December 18, 2009 11:40 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [***] Re: [PSES] Emissions from Computer power supplies -
update
In message
OF5511FBF6.56DDB639-ON88257690.0067E192
In message
OF5511FBF6.56DDB639-ON88257690.0067E192-88257690.00685348@US.Schneider-E
lectric.com, dated Fri, 18 Dec 2009,
ralph.mcdiar...@ca.schneider-electric.com writes:
As I recall, the NASA rocket booster O-ring tragedy was attributed to
putting programme schedule above all other concerns.
.
Brian
-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of John
Woodgate
Sent: Friday, December 18, 2009 10:50 AM
To: emc-p...@ieee.org
Subject: Re: Emissions from Computer power supplies - update
In message
:Re: [PSES] Emissions from Computer power supplies - update
In message
690230e9cf51aa4ebf639fae9216d5b1015a4...@mer2-exchrec1.echostar.com,
dated Fri, 18 Dec 2009, Grasso, Charles charles.gra...@echostar.com
writes:
Sorry Brian - I guess I do
IMO, Yes
Brian
-Original Message-
From: Grasso, Charles [mailto:charles.gra...@echostar.com]
Sent: Friday, December 18, 2009 10:28 AM
To: Brian O'Connell; IEEE EMC SAFETY PSTC
Subject: RE: Emissions from Computer power supplies - update
Sorry Brian - I guess I do
In message
690230e9cf51aa4ebf639fae9216d5b1015a4...@mer2-exchrec1.echostar.com,
dated Fri, 18 Dec 2009, Grasso, Charles charles.gra...@echostar.com
writes:
Sorry Brian - I guess I do not understand your position. Are you saying
that North American companies are not requiring compliant
...@echostar.com
(e2) chasgra...@gmail.com
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Brian
O'Connell
Sent: Friday, December 18, 2009 9:23 AM
To: 'IEEE EMC SAFETY PSTC'
Subject: RE: Emissions from Computer power supplies - update
Nothing I say or do necessarily represents the opinions
of North American and Western
European companies.
respectfully,
Brian
-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Derek
Walton
Sent: Friday, December 18, 2009 6:07 AM
To: IEEE EMC SAFETY PSTC
Subject: Emissions from Computer power supplies
-0600
To: IEEE EMC SAFETY PSTC emc-p...@ieee.org
Subject: Emissions from Computer power supplies - update
A few days ago I appealed for a compliant computer power supply. Since
that time my client accumulated many models ( 15 ) that fitted their
needs and we tested them all. The spread
From: Derek Walton lfresea...@aol.com
Date: Fri, 18 Dec 2009 08:07:05 -0600
To: IEEE EMC SAFETY PSTC emc-p...@ieee.org
Subject: Emissions from Computer power supplies - update
A few days ago I appealed for a compliant computer power supply. Since
that time my client accumulated many models
of several of them I'll post
the emissions chart.
I have taken the decision to write to the FCC and complain about these
being sold on the streets. EVERY single non-compliant supply was made
off shore, only one or two off shore supplies were compliant.
I encourage anyone finding such derisory
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Date: 11/10/2009 10:32 PM
Subject:RE: AC or DC coupling in emissions measurement
Sent by:emc-p...@ieee.org
One could easily calibrate out this kind
Which edition of CISPR22 is the current VCCI-3 (Emissions) equivalent to?
I know that VCCI-3 has added the telecommunications port conducted emissions
test requirement and the 1-6GHz radiated emissions test requirement, so it
must be equivalent to at least CISPR22:2005+A1:2005. However
If the impedance was say 50 - j20 ohms at 150kHz what harm would there be if
you correctly compensate for the small drop in amplitude appearing across the
50 ohm termination? (unless phase delay is a concern)
___
_
: woensdag 11 november 2009 16:13
Aan: ce-test, qualified testing bv - Gert Gremmen
CC: k...@earthlink.net; IEEE EMC SAFETY PSTC
Onderwerp: Re: AC or DC coupling in emissions measurement
If I'm not mistaken, MIL STD 461F says compensate for the coupling
capacitor during low frequency roll off. Are you
: woensdag 11 november 2009 3:11
Aan: IEEE EMC SAFETY PSTC
Onderwerp: RE: AC or DC coupling in emissions measurement
Gordon,
It would appear the AC coupling capacitor which has impedance enough at
150
KHz to cause 3 dB loss in the 50 Ohm circuit, but also that it's low
enough
RS can warrant
Gordon,
When we do conducted emissions testing we would normally protect a receiver
with a high pass filter such as a RS.EZ-25.
One expedient to insure correct response might be a 20 dB attenuator at the
receiver input. This is not unusual when using biconical dipoles as they
tend
Richmond
[Original Message]
From: ce-test, qualified testing bv - Gert Gremmen g.grem...@cetest.nl
To: k...@earthlink.net; IEEE EMC SAFETY PSTC emc-p...@ieee.org
Date: 11/11/2009 1:31:22 AM
Subject: RE: AC or DC coupling in emissions measurement
One could easily calibrate out this kind
that the input is protected
against overload.
I also need a driver for the RS ESCI 7 that will work with the Teseq C3
emissions software and force the receiver to use DC coupling.
Any offers?
Ian Gordon
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Cortland
Richmond
Sent: 11
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