I'm responding to this a little late, and only have one thing to add to what
has already been mentioned. IMHO if the emissions legal absorbers will give
you a uniform field for immunity, then you could use them for immunity testing
as well. The only reason why you might want to use a different
In message 8A23BE5F815D41408CB01F1F4621F88E02E54FAD@S1.DLSEMC.local,
dated Wed, 12 Dec 2007, Bill Stumpf bstu...@dlsemc.com writes:
There is no such thing as fully automated emissions testing!
Even if there were, it would be undesirable if it just gave 'PASS' or
'FAIL' results, or very little
I couldn't agree more. Automated EMC emissions test software gets you
running, but a test engineer must be involved in the testing process.
There is too much manual intervention during a test to allow automated
software to run with it. Cable or peripheral manipulation, EUT modes
of operation, and
I concur with the comments of Mark Briggs. And yes, the system that I
wrote failed to allow the tester to pause and adjust stuff...
But, if your local code monkeys are willing and able to write you own
software system, remember that you
1. have no support - you are on your own.
2. should develop
In message
29ee1e1d8758c842bd1bd5147a6370d326fe46d...@na-exmsg-c115.redmond.corp.mi
crosoft.com, dated Wed, 12 Dec 2007, Gary Tornquist
gary...@microsoft.com writes:
So I wonder if the cows' problem stems from the fact they are
relatively good electrical conductors.
Yes, they are. Wet feet,
In message
of520a449a.99c5da11-on862573af.00466293-862573af.00469...@mmm.com,
dated Wed, 12 Dec 2007, rehel...@mmm.com writes:
To which European standard would you test a battery operated active
oscilloscope probe? Would it be EN 61326?
I can't think of any reason to choose another.
--
OOO -
In message f49bf8e684bc6c4188d1d63513c4ca07033f8...@sparrow.dolby.net,
dated Wed, 12 Dec 2007, James, Chris c...@dolby.co.uk writes:
About time we stopped milking this one and move on to udder
things...
But this is of galactic significance. (Literally!)
--
OOO - Own Opinions
In message 47600734.3040...@umn.edu, dated Wed, 12 Dec 2007, Curt
McNamara mcnam...@umn.edu writes:
I admit to not having followed all this -- however I know an engineer
who works on building issues for people. Supposedly the most
significant problem is the neutral bonding to ground inside the
Grace -
There are benefits and disadvantages to all of the packages you are
looking at. The lab I work for decided to write our own software
because of the diverse test equipment types from different
manufacturers. This allowed us a lot of flexibility but it also
incurred a longer
In message
of8cfadeae.63d74dce-on882573af.00547ce3-882573af.00559...@selinc.com,
dated Wed, 12 Dec 2007, don_borow...@selinc.com writes:
While I don't know about voltages and currents this low, I think there
is a good case to be made for cows being sensitive to a volt or two.
Yes. I can't
Per the guide on the recent LVD update, I think the answer is it depends.
Here is an excerpt:
However, other electrical components which are intended to be incorporated
into other equipment and for which a risk assessment can be undertaken[7],
such as - transformers and electrical motors, are
Hi Gary:
You said:
0.199 V and 0.693 mA correspond to an impedance of about 300 ohms. For the
human body we often use about 1,500 ohm as a model. So I wonder if the cows'
problem stems from the fact they are relatively good electrical conductors.
Consider that the cow has four wet
Dear Members,
There have been a great discussion of software for EMC automation in the
group. Here comes the question: which software you will choose, in a month,
if you were me? There are many software packages with good reputation. I
list several below for discussion. You may wish to reply
If this was continuous, likely related to leakage. If it was a zap, then
likely charging of the antenna. I hit this problem making a preamp for my
brothers shortwave when he was in the Gulf. His antenna outside charged and
you could see a spark from the connector up to an inch long when it was
From: Richard Nute
Sent: Tuesday, December 11, 2007 9:59 PM
The NEC requires the neutral to be grounded at the service
entrance to a building.
In this case, though, the NESC applies. One discussion I read on this from c.
2001, related to installations in Alaska, indicated that this
From: don_borow...@selinc.com
Sent: Wednesday, December 12, 2007 8:46 AM
Curt McNamara wrote:
I used to work on TV antennas
and found the voltage present at the terminal of a receive
antenna on a roof was surprisingly strong.
If you felt AC voltage on the TV antenna
Might
Curt McNamara mcnam...@umn.edu wrote on 12/12/2007 08:07:16 AM:
I admit to not having followed all this -- however I know an engineer
who works on building issues for people. Supposedly the most significant
problem is the neutral bonding to ground inside the house. If this is
done in such a
From: John Woodgate
Sent: Tuesday, December 11, 2007 11:04 PM
Tarver, Peter writes:
... 0.199 volts and 0.693 mA ...
0.272 volts (.964 mA)...
The precision claimed for these is not sensible, so throws
doubt on the whole claim.
Little question of that. He must've forgotten his
It is with regret that I inform you of the passing of Vic Boersma. Vic passed
away peacefully at St. Joseph's Health Centre, Guelph, Ontario, Canada, on
Tuesday, December 11, 2007. He was 75
Vic was very active in CSA, UL, IEC TC74, TIA and other standards committees.
As expressions of
About time we stopped milking this one and move on to udder
things...
Regards,
Chris
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Gary
Tornquist
Sent: 12 December 2007 16:24
To: emc-p...@ieee.org
Subject: RE: stray voltage ??? Thinker???
0.199 V and 0.693 mA
0.199 V and 0.693 mA correspond to an impedance of about 300 ohms. For the
human body we often use about 1,500 ohm as a model. So I wonder if the cows'
problem stems from the fact they are relatively good electrical conductors.
Sincerely,
Gary Tornquist
Director of Product Safety
Microsoft
I admit to not having followed all this -- however I know an engineer
who works on building issues for people. Supposedly the most significant
problem is the neutral bonding to ground inside the house. If this is
done in such a way that significant neutral current flows through the
pipes
It could well be that those were results when the researchers averaged the
numbers, or in the case of the sensitive beast, the readings on the meters
at that instant. But I agree that it is meaningless precision.
While I don't know about voltages and currents this low, I think there is a
good
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of James,
Chris
Sent: Wednesday, December 12, 2007 2:24 AM
To: John Woodgate; emc-p...@ieee.org
Subject: RE: stray voltage ??? Thinker???
Yes - when studying power distribution many, many years ago we were told
of instances of
http://www.youtube.com/watch?v=Z3q9WdjD5wc
Check out this video on YouTube of a High Voltage power line worker who
works off a helicopter. He talks about his faraday cage suit he it
wearing. This is awesome.
The Other Brian.
From: Pettit, Ghery [mailto:ghery.pet...@intel.com]
Sent: Tuesday,
Hmmm, I'm not a great believer in tales from long ago, they usually are
observations based on the time. Is ter a modern studu on this topic? With
all the lawsuits that are popping up, may be worth doing a well thought
through one.
Just a speculative thought.
Derek
- Original Message
To which European standard would you test a battery operated active
oscilloscope probe? Would it be EN 61326?
Thanks,
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
=
-
This message is from the IEEE Product Safety
Yes - when studying power distribution many, many years ago we were told
of instances of cattle being electrocuted when standing near high
voltage pylons which either flashed over or were struck by lightning -
the potential difference developed in the ground between the front legs
and rear legs
In message
5f5a140eb5cb094bb4d2c477c8c4ad99865...@sjc1amfpew04.am.sanm.corp,
dated Tue, 11 Dec 2007, Tarver, Peter peter.tar...@sanmina-sci.com
writes:
According to one link I reviewed (again) from strayvoltage.org, cows
are very sensitive: 0.199 volts and 0.693 mA electrical current was
Hi Brian:
If the neutral is grounded at two points or more, then the
earth is in parallel with the neutral and will carry some portion
of the neutral current that flows between those two points.
This current will cause a potential difference (voltage)
between two points of the earth near or on
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