right to refrain from certifying it. That shouldn't mean that it isn't
available on the market, just that UL hasn't blessed it.
Ken Javor
Phone: (256) 650-5261
From: Derek Walton lfresea...@aol.com
Date: Mon, 14 Nov 2011 17:04:57 -0600
To: dougp01 doug...@gmail.com
Cc: Pete Perkins
I read in !emc-pstc that Ken Javor ken.ja...@emccompliance.com wrote
(in 0h9h00l4ovp...@mtaout02.icomcast.net) about 'Unity Power Factor'
on Wed, 29 Jan 2003:
I noticed this several years ago at
the office building I worked in at the time. My cube moved from one end of
the building to another
I haven't been following this thread closely, so if the following has
already been addressed, I apologize. I noticed this several years ago at
the office building I worked in at the time. My cube moved from one end of
the building to another, and my computer wouldn't always start - it took
Not an authoritative reply, just an opinion based on theoretical knowledge.
An automotive product operates from 12 Vdc, or perhaps some other dc
potential. In order for it to operate outside an auto, there must be an
external power supply involved. Presumably that problem could be solved by
The relationship between Amps per meter and Teslas is easily derived from
the basic relationship:
B = uH,
where B is magnetic induction in Teslas or Webers per square meter,
u = permeability of material which has units of Henries per meter,
H = magnetic field, with units of Amperes per meter.
I would further amplify on this comment. It is not just a 10 log vs. 20 log
calculation. Sound power is the quantity of interest, so by definition it
is a 10 log relationship . But someone said add 3 dB for each added
component. That is incorrect. You only add 3 dB for the second component.
not necessarily
see that as a bad thing, but then again I have to remind everyone of the
disclosure that I feel a certain amount of ownership in MIL-STD-461E.
You really need a one-handed EMC engineer for this question - I keep coming
up with too many on the other hand scenarios.
Ken Javor
From: Mazzola
, there
are several different curves, dependent on platform and Service usage, so
more specificity is necessary before rendering a judgment.
I served on the committee which drafted MIL-STD-461E and can likely answer
any specific questions.
Ken Javor
From: Mazzola, Santo santo.mazz...@baesystems.com
Just put an off-the-shelf unit from Best Buy or Circuit City in a metal
screen box, make sure the screen is very close to the lens, that way it is
totally out of focus and only causes a dimming of the picture, not visible
distortion.
From: Sandi McEnery smcen...@ustech-lab.com
To:
University, 3/1/02
Ken Javor
From: Michael Mertinooke mertino...@skyskan.com
To: Ken Javor ken.ja...@emccompliance.com
Subject: RE: Fiber optic cable testing per EN 55022:1998 ?
Date: Mon, Jan 13, 2003, 9:08 AM
Check out the Kerr Effect (aka the quadratic electro-optic
effect
peter.tar...@sanmina-sci.com
From: Ken Javor
Sent: Friday, January 10, 2003 9:24 AM
The answer is independent of frequency, it is the
nature of the particle
(electron vs. photon) that is key. I have
forgotten the terminology, but
one type of particle is called a boson, and per
my (quite
The answer is independent of frequency, it is the nature of the particle
(electron vs. photon) that is key. I have forgotten the terminology, but
one type of particle is called a boson, and per my (quite possibly faulty)
recollection, bosons do not interact with electromagnetic fields. For
-sourced improvements.
Ken Javor
on 2/24/03 11:04 AM, drcuthbert at drcuthb...@micron.com wrote:
The fact that going from unshielded to shielded cable cut emissions by 6 dB
does not necessarily mean that the shield cut cable emissions by only 6 dB.
It
could mean that the cable emissions have been
--
Ken Javor
EMC Compliance
Huntsville, Alabama
256/650-5261
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Ken Javor
EMC Compliance
Huntsville, Alabama
256/650-5261
mail to:
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Jim Bacher: j.bac...@ieee.org
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Ken Javor
EMC
the real
world and it would be better to monitor current on the wires and predict the
radiated fields from real world-length wires with the measured current.
Ditto for the input power leads, except here it is a given the leads are
long.
Ken Javor
on 2/20/03 1:51 PM, Muriel Bittencourt de Liz at mur
, EN61000-4-6 has a limit that is 13 dB more stringent.
Article to follow under a separate, individual response.
From: Dan Kinney (A) dan.kin...@heapg.com
Date: Mon, 17 Feb 2003 09:18:08 -0500
To: 'Ken Javor' ken.ja...@emccompliance.com, Dan Kinney
(A)dan.kin...@heapg.com, Oliver Betz list...@gmx.net
an electronic version in Word. Any
recipient would have to swear not to reproduce it because it is copyrighted
by the IEEE.
Ken Javor
From: Dan Kinney (A) dan.kin...@heapg.com
Date: Fri, 14 Feb 2003 17:13:06 -0500
To: 'Ken Javor' ken.ja...@emccompliance.com, Dan Kinney
(A)dan.kin...@heapg.com
these lines:
Genius has its limits, but ignorance has none.
Sincerely,
Ken Javor
on 2/10/03 1:26 PM, drcuthbert at drcuthb...@micron.com wrote:
An interesting article in the January issue of EMC Compliance Journal
EMC-Related Functional Safety
http://www.compliance-club.com/article.php
I'm going to add some fuel to this fire. I built a screen room in the
garage of my old home in Huntsville, Alabama and kept it for two years, over
which time its performance did not noticeably degrade. The screen material
was trade-named Britecoat aluminum, or something close to that, which I
I used to support technical sales for a Brit company, Wayne Kerr, in the
USA. They sold Farnell EMC instrumentation here in the '90s. I had never
done sales work before, and it was quite interesting. One thing I learned
was that if you were in this business and you were NOT HP, then you had
://www.ieeecommunities.org/emc-pstc
--
Ken Javor
EMC Compliance
Huntsville, Alabama
256/650-5261
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
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To cancel your subscription, send
It is interesting, nonetheless, to note that the disaster occurred in July
1967, and in September of that year, MIL-E-6051C, EMC Requirements, Systems,
was updated to the D revision, which for the first time required 20 dB
safety margin demonstrations for EEDs. Coincidence? Perhaps...
Ken Javor
, but please
stick with it.
Last note... this is not intended to pick on any individuals, or
organization, but I do want to stir the pot.
...
--
Ken Javor
EMC Compliance
Huntsville, Alabama
256/650-5261
This message is from the IEEE EMC Society Product Safety
Technical Committee emc
requirements just as the aircraft is being energized.
From: Gary McInturff gary.mcintu...@worldwidepackets.com
Date: Fri, 21 Mar 2003 13:59:54 -0800
To: Ken Javor ken.ja...@emccompliance.com, Vanduffel, Dries
dries.vanduf...@barco.com, EMC-PSTC - forum emc-p...@majordomo.ieee.org
Subject: RE
You have to understand what the purpose of the requirement is. One reason
might be to not open an internal fuse, or pop an external breaker. In
either of these cases, simply stating a max inrush current is inadequate.
What is needed is a curve showing allowable current as a function of time.
at high power levels. Just using a
network analyzer measures the small signal insertion loss. If you need to
know insertion loss near maximum applied rf power, then you will need
appropriate amplifiers and attenuators.
Ken Javor
on 3/12/03 1:38 PM, Spencer, David H at david.spen...@usa.xerox.com
on the web at:
http://www.ieeecommunities.org/emc-pstc
--
Ken Javor
EMC Compliance
Huntsville, Alabama
256/650-5261
at:
http://www.ieeecommunities.org/emc-pstc
--
Ken Javor
EMC Compliance
Huntsville, Alabama
256/650-5261
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/
To cancel your
moved, we will announce when it is back on-line.
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
--
Ken Javor
EMC Compliance
Huntsville, Alabama
256/650-5261
This message is from the IEEE EMC Society Product Safety
Technical Committee
:12 PM
To: Ken Javor; emc-p...@majordomo.ieee.org
Subject: RE: Ethernet coax connection
Ken,
It is a potential shock hazard if the coax run is long and runs from
building to building (for instance) where the ground potentials may be
different in the different buildings. One can develop
: 858-485-2537
Fax: 858-485-3788
jim.knigh...@ncr.com
-Original Message-
From: Ken Javor [mailto:ken.ja...@emccompliance.com]
Sent: Wednesday, March 05, 2003 12:58 PM
To: Knighten, Jim L; emc-p...@majordomo.ieee.org
Subject: Re: Ethernet coax connection
Assume complete ignorance
408 286 3985 fx 408 297 9121
AJM International Electronics Consultants
101 E San Fernando, Suite 402
San Jose, CA 95112
- Original Message -
From: Ken Javor ken.ja...@emccompliance.com
To: emc-p...@majordomo.ieee.org
Sent: Wednesday, March 05, 2003 12:37 PM
Subject
: 858-485-3788
jim.knigh...@ncr.com
-Original Message-
From: Ken Javor [mailto:ken.ja...@emccompliance.com]
Sent: Wednesday, March 05, 2003 12:38 PM
To: emc-p...@majordomo.ieee.org
Subject: Ethernet coax connection
Question for list members:
Background: I am troubleshooting
. One of the engineers here said
that is part of the spec - Ethernet shields are not supposed to be chassis
grounded.
Question: Can someone please explain the reason for that, and how this is
usually handled to minimize radiated emissions?
Thank you.
Ken Javor
EMC Compliance
Huntsville, Alabama
256
in broadcast bands in industrial areas.
on 3/4/03 2:15 PM, John Woodgate at j...@jmwa.demon.co.uk wrote:
I read in !emc-pstc that Ken Javor ken.ja...@emccompliance.com wrote
(in ba8a53d7.20db%ken.ja...@emccompliance.com) about 'RADIATED
IMMUNITY REQUIREMENTS FOR EN61326' on Tue, 4 Mar 2003
Please respond to Mike
Hopkins
I believe the other bands are television broadcast
M. Hopkins
Thermo KeyTek
-Original Message-
From: Ken Javor [mailto:ken.ja...@emccompliance.com]
Sent: Monday, March 03, 2003 11:03 AM
To: Gordon,Ian; 'IEEE EMC-PSTC
...@ieee.org
Archive is being moved, we will announce when it is back on-line.
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
--
Ken Javor
EMC Compliance
Huntsville, Alabama
256/650-5261
This message is from the IEEE EMC Society
Subject: Re: FCC Limits
I read in !emc-pstc that Ken Javor ken.ja...@emccompliance.com wrote
(in bad43d9e.1f13%ken.ja...@emccompliance.com) about 'FCC Limits' on
Tue, 29 Apr 2003:
At one time I needed to perform MIL-STD-462 power line audio frequency
susceptibility test CS01, which places
-pstc that Ken Javor ken.ja...@emccompliance.com wrote
(in bad41a21.1ef6%ken.ja...@emccompliance.com) about 'FCC Limits' on
Tue, 29 Apr 2003:
I am interested in opinions on the matter of the FCC changing their
CE limits to include frequencies down to 150 kHz. My concern is
predicated
, Ghery ghery.pet...@intel.com
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Date: Tue, 29 Apr 2003 11:39:39 -0700
To: 'Ken Javor' ken.ja...@emccompliance.com, Pettit,
Gheryghery.pet...@intel.com
: emc-pstc@listserv.ieee.org
List-Post: emc-pstc@listserv.ieee.org
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Date: Tue, 29 Apr 2003 10:32:20 -0700
To: 'Ken Javor' ken.ja...@emccompliance.com,
'lfresea...@aol.com'lfresea...@aol.com, Andre,
Pierre-Mariepierre-marie.an...@intel.com
Cc: emc-p
.
Ken Javor
From: Pettit, Ghery ghery.pet...@intel.com
Reply-To: Pettit, Ghery ghery.pet...@intel.com
List-Post: emc-pstc@listserv.ieee.org
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Date: Tue, 29 Apr 2003 08:25:00 -0700
I agree in all regards.
From: Ron Pickard rpick...@hypercom.com
Reply-To: Ron Pickard rpick...@hypercom.com
Date: Fri, 25 Apr 2003 11:03:32 -0700
To: tkrze...@genius.org.br
Cc: emc-p...@majordomo.ieee.org
Subject: RE: Check list for PCB Layout
Hi Thomas,
CHECKLIST
A checklist
I noticed the same.
From: k.macl...@aprel.com
Reply-To: k.macl...@aprel.com
Date: Wed, 23 Apr 2003 14:27:48 -0400
To: emc-p...@ieee.org
Subject: Repeat and late messages?
Folks -
Is it just me, or have others noticed large (days) delays in the appearance
of some posts, as well as
load,
so I'm not sure.
From: Price, Ed ed.pr...@cubic.com
Date: Mon, 21 Apr 2003 19:38:46 -0700
To: 'Ken Javor' ken.ja...@emccompliance.com, 'EMC-PSTC
List'emc-p...@majordomo.ieee.org
Cc: 'Low, Aaron S' aaron.s@lmco.com
Subject: RE: Bulk current injection method for CS101
The reason Mr. Low can't use the -461E figure Ed suggested is that Solar's
highest current capacity CS101 transformer handles 100, not the required 150
Amps. As I said in an earlier posting, such a high current load would get
an almost direct feed from the generator, which would eliminate any
There was a thread on this some time ago and I think the consensus was that
the -20 dBm limit must be a typo, or a misunderstanding by the sales dept
that writes the catalog copy. if the switch is purely mechanical, the
signal level shouldn't matter, except for here are some wool-gathering
I have the S-A catalog with the whole series 12 standard gain horns. I can
fax you the pertinent pages if you like.
From: richwo...@tycoint.com
Reply-To: richwo...@tycoint.com
Date: Thu, 10 Apr 2003 15:39:53 -0400
To: emc-p...@majordomo.ieee.org
Subject: Antenna Data Sheets
Can
).
If there are secondary reflections, the reflection point can be treated as a
new source of square-law loss transmissions, resulting in a fourth-law loss
overall. This is how a radar works.
My opinion is that the equation you found is for some special case, derivable
from the above considerations.
Ken Javor
)
and then looking at my receiver noise floor relative to that. Then I can
calculate how much if any pre-amplification I need.
Ken Javor
From: richwo...@tycoint.com
Reply-To: richwo...@tycoint.com
Date: Thu, 10 Apr 2003 08:38:55 -0400
To: emc-p...@majordomo.ieee.org
Subject: Noise Factor
As you are no doubt aware, Solar Electronics is the sole source supplier of
CS01/CS101 injection transformers. They make two models, rated at 50 and
100 Amps. I expect you could use any transformer with the right current
rating and turns ratio as an injection device over most of the CS101
That would depend on how much attenuation the human body provides, and the
coupling efficiency to the pacemaker wiring. Both of which would depend on
the frequency of the threat. I have done no HPM work, but I expect we are
talking about microwave (1 GHz +) threats. I think the attenuation
The Paschen curve that describes air dielectric breakdown vs. pressure is
not linear. I think you can find it in the Reference Handbook for Radio
Engineers.
From: Jim Eichner jim.eich...@xantrex.com
Reply-To: Jim Eichner jim.eich...@xantrex.com
Date: Thu, 22 May 2003 10:47:36 -0700
To:
What kind of course do you need? I have a one week MIL-STD-461 course. I
would like to say I presented a seminar at the genius institute :-)
Ken Javor
on 5/13/03 10:38 AM, tkrze...@genius.org.br at tkrze...@genius.org.br wrote:
Hi,
I would like to know where is it possible to attend
I'm not familiar with the software in question, but most spectrum analyzer
displays are linear, with some processing taking the spectrum analyzer display
and plotting it out as log scale. If you have dense enough info about the
transducer factor such that no significant interpolation is
:58:55 -0600
To: Ken Javor ken.ja...@emccompliance.com
Cc: emc-p...@majordomo.ieee.org
Subject: Re: another OATS question
Hi Ken,
Only the maximum reading over the scan height is used. The received signal
is nominally the vector sum of the line of sight path and the reflected or
image
I have to confess to complete ignorance here. I had no idea that the
measurements made during a height search were averaged. I though the NSA
curve was based on a specular reflection from a perfect ground plane, in
which case only the peak measurement during a height scan could correlate to
the
Office 98 Word for the Mac takes a dim view of Mr. Woodgate's wits.
From: John Woodgate j...@jmwa.demon.co.uk
Reply-To: John Woodgate j...@jmwa.demon.co.uk
Date: Fri, 20 Jun 2003 17:44:13 +0100
To: emc-p...@majordomo.ieee.org
Subject: Re: (mis)spelling humor
I read in !emc-pstc that
Electrometrics makes a dipole set that is self-tuning.
From: emcp...@aol.com
Reply-To: emcp...@aol.com
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Date: Fri, 20 Jun 2003 12:02:19 EDT
To:
To: Ken Javor ken.ja...@emccompliance.com, emcp...@aol.com,
emc-p...@majordomo.ieee.org
Subject: RE: Question about OATS
Sorry Ken I shoudl elaborate. I did not mean that the *whole* plane should be
buried.
I was referring to the edges being buried - the rest of the plane of course
exposed.
I
, but I lack direct experience.
From: Charles Grasso cgrassospri...@eartlink.net
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Date: Wed, 18 Jun 2003 20:55:31 -0700
To: Ken Javor ken.ja
The ellipse is the area clear of any reflecting obstruction above ground. I
don't see a need to tie the ground plane extent to the ellipse area. Although
theoretically keeping the ellipse clear should suffice to meet the NSA curve,
I wold be concerned about the fence near the perimeter,
Bacher: j.bac...@ieee.org
Archive is being moved, we will announce when it is back on-line.
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
--
Ken Javor
EMC Compliance
Huntsville, Alabama
256/650-5261
This message is from
I agree with you. Unsynchronized, the emissions will add randomly as the
square root of the sum of the squares. Synchronized, they add in phase,
coherently. The difference between these two techniques is
20 log (n) - 10 log (n) = 10 log (n) in dB,
where n is the number of PWMs, so the
the same intensity as more direct paths.
That is where my understanding lies at this point, and the test I described
earlier is my only way to gauge the extent of the problem.
From: Cortland Richmond 72146@compuserve.com
Date: Tue, 29 Jul 2003 14:05:16 -0400
To: Ken Javor ken.ja
I read in !emc-pstc that Ken Javor ken.ja...@emccompliance.com wrote
(in bb49768d.3717%ken.ja...@emccompliance.com) about 'pulse modulation
in reverb chambers' on Sun, 27 Jul 2003:
So if I am worried whether the 1 us pulse width can be sustained, and I
don't know how to determine
2 AA batteries are not going to cause magnetic coupling at 50 Hz. Faraday
says it ain't so.
From: drcuthb...@micron.com
Reply-To: drcuthb...@micron.com
Date: Tue, 29 Jul 2003 09:34:29 -0600
To: f...@np.edu.sg, emc-p...@majordomo.ieee.org
Subject: RE: self blinking LEDs as EMI sources WAS:
of course would also need
a blocking cap with this config).
From: istvan novak istvan.no...@worldnet.att.net
Date: Sun, 27 Jul 2003 11:02:02 -0400
To: Charles Grasso cgrassospri...@earthlink.net, Ken Javor
ken.ja...@emccompliance.com, Emc-Pstc emc-p...@ieee.org
Subject: Re: Q on Correlation
...@jmwa.demon.co.uk
Date: Sun, 27 Jul 2003 07:36:15 +0100
To: emc-p...@majordomo.ieee.org
Subject: Re: pulse modulation in reverb chambers
I read in !emc-pstc that Ken Javor ken.ja...@emccompliance.com wrote
(in bb48596e.36a1%ken.ja...@emccompliance.com) about 'pulse modulation
in reverb chambers
Zero span can show rep rate or modulation but it cannot correlate the MHz
bandwidth waveform amplitude the scope sees with the amplitude of any
particular spectral component to which the spectrum analyzer is tuned.
Further, the spectrum analyzer is a much more sensitive device than the
scope, and
As I mentioned earlier, the waveform from a switching power supply has two
distinct components, due to the fast rise-time driving current into ground
(common mode) and the pulse itself which is differential mode. Separating
modes allows you to time window properly to really resolve the waveform
Woodgate j...@jmwa.demon.co.uk
Date: Mon, 7 Jul 2003 21:58:28 +0100
To: emc-p...@majordomo.ieee.org
Subject: Re: cable maximization - do you or don't you??
I read in !emc-pstc that Ken Javor ken.ja...@emccompliance.com wrote
(in bb2efbe8.2b77%ken.ja...@emccompliance.com) about 'cable
An excellent opportunity to ask a question of list members, especially those
involved in standards writing.
Why not calculate the cable conducted emission that would result in radiated
spec level compliance, and levy a cable conducted emission requirement?
Then OATS testing would not require
ETS/Lindgren has a lot of info on their web site.
http://www.ets-lindgren.com/product_Results.cfm?producttype=Chambersapplica
tions=All%20Applicationstest_types=All%20Test%20Typesstandards=All%20Stand
ards
They list an 80 MHz and up and a 200 MHz and up chamber on this site, with
links.
From:
You don't say, but I assume that the test set-up is CISPR 22 or ANSI C63.4
or some variant thereof. If it is in fact a test on equipment that mounts
in a vehicle, then my answer would be quite different.
Tabletop mounted equipment mounts 80 cm above ground on a non-conductive
standoff.
Chas,
I solved that issue working on the presentation to the RMCEMC chapter
meeting I never attended. I am sending the derivation to you as an
attachment, off-list.
Ken
From: Charles Grasso cgrassospri...@earthlink.net
Date: Mon, 7 Jul 2003 20:58:32 -0700
To: Ken Javor ken.ja
??
I read in !emc-pstc that Ken Javor ken.ja...@emccompliance.com wrote
(in bb2f7186.2be2%ken.ja...@emccompliance.com) about 'cable
maximization - do you or don't you??' on Mon, 7 Jul 2003:
I don't think it is at all complicated, at least in principle. Maybe a
devil will emerge out of some
Apparently I didn't express myself clearly. Let me try again. If instead
of leveling on the x^2+y^2+z^2 output of the field sensor(s) when you
calibrate the quiet zone you instead verify that the desired field intensity
appears in the one desired polarization/orientation at each point in the
I made some measurements once in a 3 meter anechoic chamber built for
EN61000-4-3. I was interested in the disturbance a wire causes in a field
due to picking up the field, the resultant currents flowing in such a way as
to cancel the field that caused them, etc. In order to assess the effect,
...@majordomo.ieee.org
Subject: Re: pulse modulation in reverb chambers
I read in !emc-pstc that Ken Javor ken.ja...@emccompliance.com wrote
(in bb4987fa.372a%ken.ja...@emccompliance.com) about 'pulse modulation
in reverb chambers' on Sun, 27 Jul 2003:
As long as
those delays are much shorter than 1 us
of
measuring with a scope is if you don't have an analyzer and are going to
perform an FFT anyway.
From: Charles Grasso cgrassospri...@earthlink.net
Date: Sun, 27 Jul 2003 13:26:40 -0700
To: Ken Javor ken.ja...@emccompliance.com, istvan novak
istvan.no...@worldnet.att.net, Emc-Pstc emc-p...@ieee.org
.
From: Cortland Richmond 72146@compuserve.com
Date: Sun, 27 Jul 2003 16:44:20 -0400
To: Ken Javor ken.ja...@emccompliance.com, ieee pstc list
emc-p...@ieee.org
Subject: Re: pulse modulation in reverb chambers
Ken,
A recent article on reverberant chambers mentions a Q of 83,000 or so
Reply-To: John Woodgate j...@jmwa.demon.co.uk
Date: Sun, 27 Jul 2003 18:52:33 +0100
To: emc-p...@majordomo.ieee.org
Subject: Re: pulse modulation in reverb chambers
I read in !emc-pstc that Ken Javor ken.ja...@emccompliance.com wrote
(in bb49768d.3717%ken.ja...@emccompliance.com) about 'pulse
I presented a paper on that very subject about a decade ago at one of the
EMC TD magazine EMC symposia. I used a Fluke Scopemeter and some FFT
software that came with it. The Fluke interfaced to the PC through an
optically isolated RS-232 protocol. It worked quite well from a
pre-compliance or
work just
fine, but nanosecond rise-times would be lost.
Thanks in advance for any inputs.
Ken Javor
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From: Cortland Richmond 72146@compuserve.com
Date: Sat, 26 Jul 2003 13:06:25 -0400
To: Ken Javor ken.ja...@emccompliance.com, ieee pstc list
emc-p...@ieee.org
Subject: Re: self blinking LEDs as EMI sources WAS: LED lamps
Ken Javor wrote:
... but I wonder
I agree with most of Mr. Woodgate's commentary, but I wonder if the presence
of even an rf emission (as contrasted to 50 Hz) should cause any problem to
a land-line phone with a wired handset. It wouldn't seem likely that the
power available from a couple AA batteries would be sufficient for
can't really blame the EUT for it.
Opinions very welcome
Thanks,
Derek Walton
--
Ken Javor
EMC Compliance
Huntsville, Alabama
256/650-5261
...@ieee.org
Archive is being moved, we will announce when it is back on-line.
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--
Ken Javor
EMC Compliance
Huntsville, Alabama
256/650-5261
This message is from the IEEE EMC
if you happen to have TWT amplifiers laying around (2 - 8 GHz and 8-18 GHz
models are common), they will produce harmonics for you without any effort
at all on your part.
From: richwo...@tycoint.com
Reply-To: richwo...@tycoint.com
Date: Fri, 29 Aug 2003 14:40:51 -0400
To:
performace traceabiity
I think that Spectrum Analyzer IF filters are specified at the 3 dB points.
Communication receivers are spec'ed at the 6 dB and 60 dB points.
Dave Cuthbert
Micron Technology
-Original Message-
From: Ken Javor [mailto:ken.ja...@emccompliance.com]
Sent
My understanding is that it is the 6 dB points which are cited as the
bandwidth. I'm not up on CISPR 16 but to entirely specify the bandwidth the
60 dB down points are also specified. The slope you get from the 6 dB to
the 60 dB points is called the shape factor.
From: Charles Grasso
the set up and the measurement.
Ken Javor
on 8/20/03 7:20 AM, Price, Ed at ed.pr...@cubic.com wrote:
-Original Message-
From: Luke Turnbull [mailto:luke.turnb...@trw.com]
Sent: Wednesday, August 20, 2003 12:05 AM
To: emc-p...@ieee.org
Subject: Insertion loss of an injection
Herb Mertel of EMACO in San Diego used to provide English translations of
German VDE specs. He sold EMACO to TUV many years ago and retired. Maybe
someone on this list knows the TUV San Diego people and can find these specs
or contact Herb. Ed Price?
From: Nick Williams
I don't know what would cause a 30 dB variation, but a standard source could
be several things. MIL-STD-461E requires proving the measurement system
integrity by injecting a known signal between the LISN power output
connector and LISN chassis and measuring it off the LISN port. Here an rf
I don't have the text but the difference in conductivity and permeability are
opposite trends, so I wouldn't be surprised if at some particular frequency
the skin depths would be equal.
From: garymcintu...@aol.com
Reply-To: garymcintu...@aol.com
List-Post: emc-pstc@listserv.ieee.org
List-Post:
I thought just the opposite, that X-caps were for line-to-line usage, and
Y-caps were line-to-ground.
From: drcuthb...@micron.com
Reply-To: drcuthb...@micron.com
Date: Wed, 6 Aug 2003 12:12:47 -0600
To: emc-p...@majordomo.ieee.org
Subject: X and Y caps
Here is a new question/comment
Why not build an unregulated linear power supply out of parts from Radio
Shack? Or buy a cheap 12 Volt lead-acid battery 1 or 2 Amp trickle charger
and put a filter cap on the output.
As long as it is unregulated, it should not respond in any anomalous fashion
to EMI.
From: Chris Chileshe
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