Hi All,
If you use BNC or SMA connectors you may be interested in my Technical Tidbit
article this month:
Technical Tidbit - December 2008
Inexpensive Protective Caps for BNC and SMA Connectors
Abstract: Sometimes a device intended for one use is also suitable for another
and often provides an
In message
9d04b979323dcd428297dda95108893e0120c...@bb-corp-ex2.corp.cubic.cub,
dated Tue, 9 Dec 2008, Price, Edward ed.pr...@cubic.com writes:
If I lay a BNC or SMA cable (assuming 1/4 cross section by 10 foot
exposure length) onto the working area (about 16' by 12'), the cable
occupies
If you ban cell phone use in an EMC lab then you should also consider doing so
in adjacent locations - one side of a door is much the same as the other!
Vic Gibling
Vagabond Compliance Engineer
2008/12/9 Luke Turnbull luke.turnb...@trw.com
Hi all,
Should we ban
In message
4e373bdd0812100200m73f17b59u52351eefccdd7...@mail.gmail.com, dated
Wed, 10 Dec 2008, Vic Gibling vicgibl...@googlemail.com writes:
If you ban cell phone use in an EMC lab then you should also consider
doing so in adjacent locations - one side of a door is much the same as
the
Pessimism is an asset in this line of work.
Some time ago, I persuaded a lab to perform a cable attenuation test. What
really got me going was cable factors that at some frequencies exhibited
negative loss!
And folks think I'm hard on automation.
There were indentations in the
No surprise, except it's Congress doing the complaining.
Cortland Richmond
k...@earthlink.net
EarthLink Revolves Around You.
-
This message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list. To post a message to the list, send your e-mail to
emc-p...@ieee.org
Luke,
Yes, because:
The phone radiation might interfere during
emission tests by
entering the chamber via a penetration
interfering with external support equipment
create spurious emissions by creating secondary mixing products
immunity tests by
being
Ed,
I can extend the theory of unexplained attraction to other areas.
when the screened room door has a brass surround with finger stock mounted
within, then
a) people will stand on the door frame even when you tell them not to.
b) people need to poke at the finger stock to check how
I am so glad you posted this. I have seen this phenomenon but didn’t have
the guts to tell anyone in fear of being labeled crazy (again). Where I
really notice this affect is when I am doing radiated immunity Calibration and
I have my bright orange fiber optic cable running to my Field Probe.
The Company has the right to accept or not any component for any
reason even though in this case the reason they give seems unreasonable.
I expect there are other reasons they do not want to use this component
and they are just using this as the excuse.
If the Company is trying to get NRTL
Good morning,
I’ve got a question for the chamber experts and experienced folk here.
Please respond off-line unless it would be to the betterment of the group at
large.
We’ve just received the results of a business insurance audit.
The only area of our building with a fire suppression
. . . this includes 'spherical cow' type approximations . . .
And that's why I like this list -- I learn new things all the time:
http://en.wikipedia.org/wiki/Spherical_cow
Pat Lawler
EMC Engineer
SL Power Electronics Corp.
emc-p...@ieee.org wrote on 12/10/2008 12:21:12 AM:
In message
SMPS seem to be very good at producing common-mode emissions on all the
cables attached to them and the products they power. Would someone
please give me a simple explanation of how these common-mode emissions
are generated?
I don't get involved with the internals of SMPS, and I've been given
-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf
Of John Woodgate
Sent: Wednesday, December 10, 2008 12:21 AM
To: emc-p...@ieee.org
Subject: Re: Cables On The Floor
In message
9d04b979323dcd428297dda95108893e0120c...@bb-corp-ex2.corp.cubic.cub,
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Haynes,
Tim
(SELEX GALILEO, UK)
Sent: Wednesday, December 10, 2008 5:10 AM
To: Luke Turnbull; emc-p...@ieee.org
Subject: RE: Mobile Phones in EMC Labs
There is another phenomena that seems to be world wide. It’s what I call
the “Find a choke point and fill it” syndrome. Have you ever noticed that
if there is a narrow(er) spot in a passageway that people just naturally stop
there to converse, think about what they’re going to do next, or
I’m looking for an AC Outlet connector similar to the IEC 60320 C6 or C8,
but an outlet instead of an inlet. I need to run AC power out of my product
to a small external device which mounts on the side (lab equipment) and will
only draw less than 2 amps at 230 Vrms. I do not want to use the large
Hi Ed,
Google spherical cow and you'll be enlightened. And given the concept,
I'm quite sure the term could find its way into a status report or two.
:-)
Best regards,
Ron Pickard
ron.pick...@intermec.com
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Price,
Edward
Sent:
In message
9d04b979323dcd428297dda95108893e0120c...@bb-corp-ex2.corp.cubic.cub,
dated Wed, 10 Dec 2008, Price, Edward ed.pr...@cubic.com writes:
BTW, I'm almost afraid to ask, but what's a spherical cow?
It's a typical simplification used by physicists when asked about some
not-quite-simple
From Wikipedia, the free encyclopedia
Spherical Cow is a metaphor for highly simplified scientific models of
reality. The phrase comes from a joke about theoretical physicists:
Milk production at a dairy farm was low so the farmer wrote to the local
university, asking help from
I like this one a lot better.
Spherical Cows
by Robin Shelton and J. Allie Cliffe
When scientists refer to a spherical cow, we are poking fun at ourselves. We
are admitting that some of our models or descriptions of things are far more
simple than the actual object, like to say that a
You're almost there. 'Outlet' versions of the IEC 320 connectors you
mentioned would be type C5 or C7. See
http://en.wikipedia.org/wiki/IEC_connector#C7_and_C8_connectors
However, I don't know where you would buy a chassis-mount version of a C5
or C7.
Pat Lawler
EMC Engineer
SL Power
Not intending to sound glib, but
Can you please provide an explanation for the behavior of all
mammals ? No two species appear to be consistent.
I --might-- be able to provide an explanation for certain
topologies, when implemented with a some component types, that
are have specific PCB
I'm aware of some people making their own CDN's and LISN's among other things
and I have few questions about that.
1) Has anyone tried to build their own EM Injection clamp?
If so, were you able to find a ferrite supplier that sold half-ring
cores?
2) Is it acceptable to calibrate your
If you are looking for a panel mount outlet, try Schurter.
http://www.schurter.ch/pdf/english/typ_5088.pdf
http://www.schurter.ch/pdf/english/typ_5888.pdf
Ted Eckert
Compliance Engineer
Microsoft Corporation
ted.eck...@microsoft.com
The opinions expressed are my own and do not
Hi TOB,
You might find what you're looking for from Shurter at:
http://www.schurter.com
They have quite an assortment of panel mount IEC 60320 style power input
connector products, filtered and unfiltered.
Best regards,
Ron Pickard
ron.pick...@intermec.com
From: emc-p...@ieee.org
Since all mammals do indeed have certain traits in common, I will attempt to
answer the question at admittedly a conceptual level.
The SMPS switching device operates between two extreme potentials: the
rectified mains potential, and ground. Further, there is capacitance between
the switch and the
In message
0ed66cd2c9bd0a459d54fb9119a60567d06...@mailserver.lecotc.com, dated
Wed, 10 Dec 2008, Kunde, Brian brian_ku...@lecotc.com writes:
I?m looking for an AC Outlet connector similar to the IEC 60320 C6 or
C8, but an outlet instead of an inlet.
They are listed in IEC/EN 60320-2-2, but
In message 002d01c95b12$ad6276a0$d600a...@tamuracorp.com, dated Wed,
10 Dec 2008, Brian O'Connell oconne...@tamuracorp.com writes:
Can you please provide an explanation for the behavior of all mammals ?
No two species appear to be consistent.
All mammals:
- have hair;
- bear young
In message c5659d9e.3351c%ken.ja...@emccompliance.com, dated Wed, 10
Dec 2008, Ken Javor ken.ja...@emccompliance.com writes:
Might be the Forrest Gump explanation - but Forrest would have
recognized that mammals have a lot in common even though they occupy
all sorts of different evolutionary
In message
44724788633d3042a64174bea5c59f3004bc2...@ntxboimbx21.micron.com, dated
Wed, 10 Dec 2008, cmander...@micron.com writes:
1) Has anyone tried to build their own EM Injection clamp?
If so, were you able to find a ferrite supplier that sold
half-ring cores?
The prototype was
In message
of3659c37b.9dd6fd38-on8825751b.0074d8ec-8825751b.00761...@slpower.com,
dated Wed, 10 Dec 2008, pat.law...@slpower.com writes:
ou're almost there. 'Outlet' versions of the IEC 320 connectors you
mentioned would be type C5 or C7. See
First you seem to condemn all SMPS to common mode emissions. Far from
true. Most switching power supplies (at least the smaller ones) rectify
the line and then use higher frequency DC to DC converters. It saves
iron and with modern fast components you don't lose much in efficiency
due to
Doug – I think the answer lies with the NRTL that you use to obtain your
CB scheme approval. They will perform an evaluation of you product
to some standard and from that derive the parts that will be determined
as critical.
Chas
From: emc-p...@ieee.org
SMPS without PFC front ends can cause high common-mode and differential
mode conducted emissions, and significant radiated emissions due to
common-mode cable currents. PFC is not a necessary element to this
problem, although it does introduce additional challenges. The basic
mechanism that was
This is a subset of a bigger problem: the meaningless nature of the UR
mark. Since UL allows itself to issue this mark with less than full
evaluation or testing to the standard, or with less than full
compliance, anybody using a UR part needs to take that approval with a
bucket (not a grain) of
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