. And don't forget to correct your readings for this.
It may seem counter intuitive, but using a small value pad and then turning on
the preamp has worked well for me.
All the best in the New Year,
Doug Powell
Sent with Xobni Mobile - http://xobni.com/mobile
Sent from my Verizon Wireless
level. 0 Hz - 30 MHz
Doug Powell
Sent from my Verizon Wireless BlackBerry
-Original Message-
From: doug...@gmail.com
Date: Tue, 27 Dec 2011 16:47:18
To: Grace Lingraceli...@gmail.com; EMC-PSTC@LISTSERV.IEEE.ORG
Reply-To: doug...@gmail.com
Subject: Re: [PSES] Protect An EMI Receiver
contractors and operating
these devices while under load can cause huge inductive spikes on the LISN.
- Doug Powell
Sent from my Verizon Wireless BlackBerry
-Original Message-
From: Ken Javor ken.ja...@emccompliance.com
Date: Tue, 27 Dec 2011 12:03:23
To: EMC-PSTC@LISTSERV.IEEE.ORG
The CISPR 16, 5 uH LISN.
Doug Powell
Sent from my Verizon Wireless BlackBerry
-Original Message-
From: Ken Javor ken.ja...@emccompliance.com
Date: Tue, 27 Dec 2011 13:40:13
To: EMC-PSTC@LISTSERV.IEEE.ORG
Reply-To: Ken Javor ken.ja...@emccompliance.com
Subject: Re: [PSES
Sharepoint is a good solution, so long as the servers on the back-end have a
robust backup system. In the last couple of years I went through some
difficulty in proving this was true for my ISO 17025 lab certification efforts.
The problem I found was the I.T. department policies, or rather
All,
With some folks retiring and others I know are changing careers (recently
termed “retooling”), I had some pensive thoughts about losing many folks who
are experts in the field or those with great wisdom. So it occurs to me, I
would like to hear your favorite quotes on Wisdom and
The numbers are down somewhat. I seem to recall the late 1990s we were about
800 strong.
Doug
Douglas E Powell
doug...@gmail.com
http://www.linkedin.com/in/dougp01
Sent from my Verizon Wireless BlackBerry
-Original Message-
From: Scott Douglas emcp...@radiusnorth.net
Date:
of the
economy?
Ed Price
El Cajon, CA
USA
-Original Message-
From: Doug Powell [mailto:doug...@gmail.com]
Sent: Monday, January 16, 2012 6:58 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] EMC-PSTC Email List Subscriber Status as of January 4,
2012
The numbers are down
This discovery has a lot of potential. A self-monitoring battery could easily
signal for help or open an interlock. If caught early enough, a thermal
runaway might be averted. This could be especially important on large devices
like electric vehicles or charge controllers.
This discussion has become interesting.
Possibly ratings are common knowledge and possibly not. I'm sure everyone has
an awareness of ratings, but do they have an understanding? And if they don't,
do ratings serve any purpose for the end user?
I suggest most people understand they must
Hi all,
Is there a particular U.S. Military standard which could be considered an
approximate equivalent to IEC 61010-1?
Sometimes military and commercial standards do parallel in some ways.
Thanks!
Doug
Sent from my Verizon Wireless BlackBerry
-
To my knowledge there is no internationally accepted symbol specifically for
this. However, the ! symbol in a triangle directs the user to refer to
documentation before installing/using. In the user documents is where you
would detail this info in the language of the region.
Doug
Douglas E
All,
It seems there is a change in 61010-1 regarding the exclusive use to
green / yellow color coded parts. In the past these colors were
reserved solely for the use of the protective conductor, and
protective bonding devices. This is generally true of safety
standards based in or harminozed to
I realize this is not an authoritive page with regard to codes and
standards but it has a good synopsis of the grid and power
distribution.
http://en.wikipedia.org/wiki/Electric_power_distribution
Check the graphic on General layout of electricity networks
-doug
Douglas E Powell
These voltages, and more, all exist today. It depends on the system to which
you are connected.
The 110 is from a 220 split phase feed. Often this is from of a secondary of a
delta connected transformer. Normally 120v is derived from a 208v three phase
wye system. It is from one of the
Excellent advice Rich.
I am a proponent of “design for compliance” and have been for years.
Getting involved early solves more than you can possibly know; if possible
do it at the napkin design stage. Here is a list of ideas
that immediately come to mind, there's probably much more.
1)
For many years I have consistently seen broken web pages and defective
search screens at CENELEC. Just today I tried again and several of their
pages say:
Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance
downtime or capacity problems.
I received many replies, public and private, and many people have assisted
me, thank you!
In particular, Gert Gremmen in The Netherlands was able to create a trouble
ticket on the CENELEC web site and here is the response. I for one, will
be flagging my shortcut to CENELEC with their expected
The man who taught me compliance said internal wires could be any color. This
was back in the days of VDE 0160. And my certs went through LGA Nurnberg
The exception was of course the ground circuit. There was strong direction to
avoid confusion with DC circuits, especially the Red for
I think there is some variance in standards for green/yellow colors.
I believe IEC 60204-1 has some guidance on the actual color mix, also standards
for HAR wire should have this. The rule I have seen is for more than just a
trace of color. Nominally the green/yellow mix should be 50%/50%.
I'm afraid these old solutions will not work for long.
The new trend is all about the next level in tracking your browsing habits
and targeted advertising. ALL web browsers are susceptible, that is if you
want to keep modicum of functionality on the web these days. The list of
susceptible
The in the acoustics section 12.5 of 61010-1 are the concepts of operator
and bystander positions. The standard clearly states dimensions for the
test room, yet it does not clearly state what distances are for
personnel. Let's assume a control panel is mounted in a rack system, at
eye-level, and
the floor.
The Other Brian
*From:* emc-p...@ieee.org [mailto:emc-p...@ieee.org] *On Behalf Of *Doug
Powell
*Sent:* Wednesday, April 25, 2012 12:47 PM
*To:* emc-pstc
*Subject:* IEC/EN 61010-1
The in the acoustics section 12.5 of 61010-1 are the concepts of operator
and bystander positions
All,
I am seeking information on availability of a test lab, qualified to do CEC
efficiency testing (Sandia protocol) for Solar PV with power capability of
up to 500 kW. Preference is an accredited lab able to write a letter
of attestation. Location is only of secondary concern.
--
Thanks,
I set up a gmail account and went through the steps to buy a couple
standards. The site seems to have a functioning shopping cart software and
the privacy report says they are using
https://payment_fashionpay_com/sslpayment as their shopping cart software.
A quick InterNIC check of
A change was made in 3rd Ed. for routine mains hipot tests while clamping
devices are still in the circuit; specifically clause F.3.2 (Ed. 3).
The standard states the test can be carried out at 0.9 times the
clamping voltage of the device and not less than twice the working
voltage. Edition 2
a nominal voltage of 650/0.9 = 720 V.
Sounds like a letter to the Chair and Secretary of TC 66 is needed to
resolve this matter.
Regards
Mick
On 10/05/2012 00:27, Doug Powell wrote:
A change was made in 3rd Ed. for routine mains hipot tests while clamping
devices are still in the circuit
, 2012 12:00 PM
*To:* EMC-PSTC@LISTSERV.IEEE.ORG
*Cc:* Doug Powell
*Subject:* Re: [PSES] Hipot with in-circuit voltage limiting devices IEC
61010-1 3rd Ed.
Doug,
I wouldn't credit the TC 66 has having MOV component knowledge, just
perceptions.
Since my last message I have sent
The routine voltage test on mains is mandatory, but the method has options.
This is how I read the standard.
--
Thanks, -doug
Douglas E Powell
doug...@gmail.com
http://www.linkedin.com/in/dougp01
On Thu, May 10, 2012 at 2:04 PM, John Woodgate j...@jmwa.demon.co.uk wrote:
In message
My question for today.
What is the typical test setup for radiated EMC measurements of general
purpose off the shelf switching power supply; is the resistor test load
tightly coupled to the output terminals of the PSU or is it on a long wire
and taken down the 80 cm of the table and out of the
Gert,
It would seem a motherboard is SELV circuitry and not subject to functional
spacings or a dielectric test. Or am I misunderstanding your application?
Doug
Douglas E Powell
doug...@gmail.com
http://www.linkedin.com/in/dougp01
Sent from my Verizon Wireless BlackBerry
-Original
This is my Friday Question:
What exactly is the point of IEC 61010-1:2010 section 6.7.1.4?
It mentions requirements depend on factors in 6.7.1.1 a) to d), which by
the way is true for all insulation, then provides a four paragraph tutorial
on types of construction, electric strength, gaps,
Greetings all,
I would like someone to verify my thoughts in IEC 61010-1:2010 section 16.2
d) Ergonomics Aspects - arrangement of TERMINALS.
This clause is a bit obscure (possibly incomplete) and to be honest makes
no sense in the ways I have seen it used so far. This new section 16 is
all
Brian,
NRTLs are under to oversight of OSHA, although I was not aware they would
do field surveys like this.
See: http://www.osha.gov/dts/otpca/nrtl/
--
Thanks, -doug
Douglas E Powell
doug...@gmail.com
http://www.linkedin.com/in/dougp01
On Tue, Jul 3, 2012 at 10:55 AM, Brian Oconnell
Being as he said no interest in E-Fields, I imagine it's about human exposure
limits. And as always, it depends on where which jurisdiction is making
requirements.
Doug
Douglas E Powell
Compliance Engineering and Consulting
http://www.linkedin.com/in/dougp01
-Original Message-
From:
Monrad,
I am not aware of any need to save hard copy reports, especially after enough
time has elapsed. Document retention in the EU for liability directive is
still 10 years (you might double check that).
Otherwise, I have been doing electronic submittals (of safety reports) to my
I'm curious,
Why is this paragraph added near the end of the section?
*If equipment conforming to IEC 60950 is used with equipment conforming to
this standard, and if there is a HAZARD due to moisture or liquids, the
instructions for use shall specify any additional precautions necessary.*
Douglas E Powell
doug...@gmail.com
http://www.linkedin.com/in/dougp01
On Jul 3, 2012, at 10:54 AM, Doug Powell doug...@gmail.comwrote:
Greetings all,
I would like someone to verify my thoughts in IEC 61010-1:2010 section
16.2 d) Ergonomics Aspects - arrangement of TERMINALS.
This clause
existing CB reports to see how CABs are interpreting this
mess
that is called 61010-1.
Brian
-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Doug
Powell
Sent: Monday, July 30, 2012 7:59 AM
To: emc-p...@ieee.org; EMC-PSTC@listserv.ieee.org
Subject
] On Behalf Of Doug Powell
Sent: Monday, July 30, 2012 10:36 AM
To: Doug Nix
Cc: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Ergonomics Aspects - arrangement of TERMINALS in IEC
61010:2010
Brian and Doug,
Thanks for the reply.
My assertion is that 61010-1 section 16 is titled Hazards resulting
from
Maybe I should have saved this for a Friday question, but here goes.
This is a general question regarding ignition sources and exposure time.
In reviewing the flammability (UL 94) tests and the hot wire ignition
(UL 746) tests, it seems 30 seconds is the magic number for igniting
the sample
know...)
More comments?
-doug
On 8/15/12, John Woodgate j...@jmwa.demon.co.uk wrote:
In message
cabyvtvny1rjvr5g8moofwhm43wpbooszi0yrefkimxx6dvg...@mail.gmail.com,
dated Wed, 15 Aug 2012, Doug Powell doug...@gmail.com writes:
For example the UL 94 test is a 30 second exposure to a 50W flame
And the CE mark, what happens to it?
CE = Communauté Européenne
--
Thanks, -doug
Douglas E Powell
doug...@gmail.com
http://www.linkedin.com/in/dougp01
On 8/16/12, peter_kelle...@dell.com peter_kelle...@dell.com wrote:
EU = European Union
EC = European Community
The Treaty of Lisbon
[mailto:emc-p...@ieee.org]On Behalf Of Doug
Powell
Sent: Thursday, August 16, 2012 2:30 PM
To: peter_kelle...@dell.com
Cc: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] EC vs EU suffix
And the CE mark, what happens to it?
CE = Communauté Européenne
--
Thanks, -doug
Douglas E Powell
]
Sent: Thursday, August 16, 2012 2:44 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] EC vs EU suffix
Conformité Européenne
-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Doug Powell
Sent: Thursday, August 16, 2012 2:30 PM
To: peter_kelle
Personal opinion only...
Make the alternative bulbs economically competitive and dump the legislation.
--
Thanks, -doug
Douglas E Powell
doug...@gmail.com
http://www.linkedin.com/in/dougp01
On 8/24/12, Pearson, John john.pear...@polycom.com wrote:
Hi
Any opinions on this?
] Light Bulb provokquium
In message
CAByvTVPDdQ343GbF8=AxXZSgajd7cvH1Q=P2zp98Q+QHAD-=c...@mail.gmail.com,
dated Fri, 24 Aug 2012, Doug Powell doug...@gmail.com writes:
Make the alternative bulbs economically competitive and dump the
legislation.
Chicken and egg; the industry wouldn't have spend
Very true, all new inventions do cost more at first. That's why
investors were invented.
Now a few companies have learned how to get various legal entities to
mandate their products find a market.
-doug
On 8/24/12, Ken Javor ken.ja...@emccompliance.com wrote:
The EMC Compliance screen room
Blazing Saddles
http://www.linkedin.com/in/dougp01
-
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
All emc-pstc
Ken,
Even though they may have a DC rating that exceeds the AC Peak of the line.
There are more factors.
Line rated caps also have surge ratings, typically in the kV range. Derek
mentioned the X an Y series and surge is one of the main attributes of this
type. I once had an RF engineer
All,
I have noticed many IEC publications (in PDF) have a series of symbol
embedded in varying locations on every page. They consist of string of
punctuation marks. This sample string is somewhat randomized but it is
representative.
-``--`-`,,`,,,`,`,,`,`,,`--,,`-`,`,`,`,,`---
Is this
Aside from all the regulatory issues of leakage current and nasty failure modes
of MOVs. What methods have been used to detect a failed transient suppression
device in equipment? Or, is there some expectation the devices will survive a
warranty period and that alone is good enough?
Seems
Fred,
While MOVs tend to be messy and TSBs can short both of these devices can fail
in an open state as well. Or, the device shorts and a protection fuse may
open. At which time the transient device is open, protection it afforded is
gone and the equipment continues to operate. This is the
Don,
Voltage sensing the fuse is useful on any line which has enough voltage with
respect to earth. The MOV tied to the neutral is much more difficult to detect
in this way. However, I would venture to say that this MOV is not subjected to
so many impulses as the other.
The line-to-line
Don,
I say this because one of the foreseeable operating modes in several
standards is the reversal of line and neutral. This can also become an
undetectable situation in many product designs. IN addition, most EMI
filter designers who incorporate MOVs will place them symmetrically on Line
and
True enough.
However I have seen when MOVs have been directly connected to earth when
Recognized using UL 1449. If not, there are schemes where spark gaps are
placed in series to limit leakage. Spark gaps do have their own special
concerns.
-doug
http://www.linkedin.com/in/dougp01
At the risk of redundancy, I would like to re-open a question from
2008 What's the deal with Wire Nuts?
http://www.mail-archive.com/emc-pstc@listserv.ieee.org/msg56599.html
The original discussion seems to track well with my own opinion on the
use of these wiring devices, but this is based my
I know of IEC 61000-3-2:2005-11, 3rd edition. Is it possibly a typo?
Doug
Douglas E Powell
Independent Compliance Consultant
970-646-3732
http://www.linkedin.com/in/dougp01
http://www.linkedin.com/in/dougp01
-Original Message-
From: Knighten, Jim L jim.knigh...@teradata.com
Date:
-Original Message-
From: Doug Powell [mailto:doug...@gmail.com]
Sent: Monday, October 08, 2012 10:45 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] What's the deal with Wire Nuts?
At the risk of redundancy, I would like to re-open a question from
2008 What's the deal with Wire Nuts?
http
I am not aware of regulatory requirement that HW and SW numbers must be somehow
synchronized, even for functional safety. However, whatever numbering scheme
you choose must be traceable to the model and shipped serial number. This is
becoming even more important a companies start using more of
In the case of IEC 61010-1 Ed 3, it is possible to reduce clearance
requirements utilizing Annex K.
In another case, say you have a brick power supply approve for use in OV Cat II
but your application has an extended environmental condition of OV Cat III. In
order to use this power supply,
I would think the device only needs to pass the required surge testing of
EN61000-4-5 as well as associated EFT/Burst and Ringwave, if required.
Doug
Douglas E Powell
http://www.linkedin.com/in/dougp01
--Original Message--
From: Richard Nute
To: Doug Powell
To: EMC-PSTC
ReplyTo
the device only needs to pass the required surge testing of
EN61000-4-5 as well as associated EFT/Burst and Ringwave, if required.
Doug
Douglas E Powell
http://www.linkedin.com/in/dougp01
--Original Message--
From: Richard Nute
To: Doug Powell
To: EMC-PSTC
ReplyTo: Richard Nute
John,
The susceptible components in a filter are the Y and X capacitors.
Y are for line to earth connections. These are typically rated and certified
as Y1, Y2, etc. This rating is specific to the surge withstand capability in
the IEC component test standard. Similarly the X capacitors
John,
It appears 60936 may be withdrawn, try EN 132400. In any case, I believe
filters are generally safety certified without use of MOVs, not mandatory. I
have asked vendors to add these to a custom filter and to the requirements of
other product standards such as EN 60950, EN 61010-1 or EN
John,
Sorry, typo.
So now I'm not certain I understand what you are asking. Can you clarify?
Doug
Douglas E Powell
http://www.linkedin.com/in/dougp01
http://www.linkedin.com/in/dougp01
-Original Message-
From: John Woodgate j...@jmwa.demon.co.uk
Date: Mon, 17 Dec 2012
Typically the spring loaded impact hammer is 0.5 Joules, the 50mm steel sphere
is 5.0 Joules when doing the vertical or pendulum drop.
Doug
Douglas E Powell
http://www.linkedin.com/in/dougp01
http://www.linkedin.com/in/dougp01
-Original Message-
From: sudhakar wasnik
Yes you can, just make sure it meets IK08 requirements in mass, size and is
calibrated. You can either purchase the IEC/EN 62262 reference document for
impact testing or use this link for guidance, the data is accurate
http://en.m.wikipedia.org/wiki/EN_62262
All the best,
Doug
Douglas E
Derek,
I could be wrong, but I don't believe there is a product standard for
telescopes in general. But if you have a motor-driven tracking system, there
will be something needed for this portion of the product; for CE marking and
entry into Europe. This will include electrical / mechanical
Interesting discussion about the 40th parallel. As it turns out the exploration
of the American territories in years past has often involved this line. I
personally drive across this delimiter every day, traveling to and from work.
My workplace in Louisville Colorado is at latitude 39.96745
Scott,
I would think this is a toy. They may also be considered an accessory to
audio/video equipment, although there is nothing electrical about the device
itself. They certainly would have child appealing aspects.
Just my personal thoughts on this,
Doug
Keep your face always toward the
All,
Regardless of a connector's ampacity, you should always refer to the USB
specification and its limits. I cannot vouch for how much current a
manufacturer may decide to put on the port, but if they exceed the USB
standard, they are outside the spec. Conversely manufacturers sometimes
Nice article.
It begs the question, is this the new de facto standard for powering digital
appliances?
Doug
Douglas E Powell
http://www.linkedin.com/in/dougp01
-Original Message-
From: Curt McNamara mcnam...@umn.edu
Date: Mon, 27 May 2013 12:39:08
To:
All,
Does anyone happen to know where I can find a specificaiton or data sheet
for the Keytek PK1001D 6kV differential probe that includes the input
impedance?
I thought this would be easy but it's turning into a challenge.
Thanks,
-doug
-
To my knowledge, IEC-based standards do not specify this. If there is a requirement, possibly a local governing entity has required this. Sometimes the national code of a EU member country imposes additional requirements.
Once you purchase the standard, all information about this current edition is included in the front matter including effect effective dates. That is, dates when it becomes mandatory. Thanks -doug
There is an additional wrinkle. Although the 3rd edition of 61010-1 is available in North American at some NRTLs. There are virtually no Part 2 standards available to go with it. Technically you cannot use a Part 2 intended for edition 2 with edition 3. The committees are now under the gun to
Seems to me the proper people were notified and due diligent has been
exercised. If they cannot seem to get all of their ducks into one row, it is
an issue they must deal with.
thanks, –doug
Douglas E Powell
doug...@gmail.com
http://www.linkedin.com/in/dougp01
Brian,
I am personally opposed to such an idea. The first time I saw this was circa
1982 on an electronic security system; designed to tie into the public
telephone network. The manufacturer wanted additional protection above the
outdoor surge protector. The design involved two parallel
From: Joe RandolphSent: Friday, September 6, 2013 1:05 PMTo: Doug Powell; EMC-PSTC@LISTSERV.IEEE.ORGSubject: Re: [PSES] Spark Gap PCB Layout on AC Mains
Hi Doug:
You mention
doug...@gmail.com
http://www.linkedin.com/in/dougp01
From: Joe Randolph
Sent: Friday, September 06, 2013 11:34 AM
To: Doug Powell ; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Spark Gap PCB Layout on AC Mains
Hi Doug:
I think we are in agreement about some of the pitfalls of spark gaps
Gary,One other concern you should be aware of. With 60950, the majority of products are evaluated to Overvoltage Category II, while it is possible that your 61010-1 product is evaluated to OV Cat III. This will have a significant effect on determination of your minimum clearance requirements as
John,
In my company, I often run into this problem and a non-contact or infrared
thermometer is not always pratical. Like you, I also had to resort to
momentary turn off to get accurate readings. In one instance, I had magentic
fields strong enough to cause damage to the instrument. There
Title: For indoor use only
For the restricting of use by children, the latest editions of IEC Standards are including foreseeable risk as a potential hazard. In concept, this would include use of an appliance by children when used in household or other places when children are present. Factors
All,Of all the people on this forum I'm certain we all share to some extent the same quandary.I am currently searching for work either as full time or as contract. Part of the coaching I received is to develop a 30 second elevator speech to describe myself to almost anyone. One of the
: Doug Powell [mailto:doug...@gmail.com]
Sent: Monday, September 30, 2013 6:18 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Job titles
All,
Of all the people on this forum I'm certain we all share to some extent the
same quandary.
I am currently searching for work either as full time
CortlandI am not certain you speed limit example explains the point you are trying to make.Here in Colorado we have the Colorado Revised Statutes, or CRS. In these laws are all the requirements for citizens to follow so they are in compliance with the law. In practice posted speed limits are akin
Anthony,If you are testing to one of the various IEC safety standards or an IEC-derived standard or CISPR standards, there are many official test report forms (TRF) available on the IECEE website. You can ask your agency for a copy. I would suggest that any table or entry in the TRF requiring
Grace,
The term active power is sometimes used instead of real power, both mean
the same thing and both are contrasted with reactive power.
As John states, the rated power is the manufacturer's own claim and
sometimes there is very little real science that goes into this number. In
the
All,
This is topic that often confuses people and I have personally wrangled with it
for many years. In that time, I have developed a procedure which have served
me well enough.
In the end it comes down to validation by testing. This product engineer may
have “calculated” a rating or even
Am I missing something (always possible). Is the test computer in the RF test field or outside the test field?If only required for the test setup and not part of the device under test and you are doing radiated emissions and immunity, a long I/O cable with a bunch of ferrite and / or a decoupling
Pat,I find it is far easier if you ask them to justify a non-standard mains configuration. And stick to your position.Too often it is easy to get caught in a conflict where the person who is responsible for a product has a test failure and wants to blame the test setup, the standard or anything
Title: Definition of accessible parts
Generally speaking hot surfaces and electrically accessible should not be confused. They are both hazards however. The standards I usually work with talk about touch on hot surfaces. Whereas an accessible surface is one which may become energized as a result
All,
It is interesting that both Turkey and Poland were mentioned, these are to
my knowledge not full members of the European community. Could they be
nearing full membership and over-exercising due diligence? It is possible
they want to see a certificate with all the page border filigree.
Egide,
As you mention, EMC is not something you find on every curriculum. I am aware
of the University of Science and Technology at Rolla Missouri offering courses
in EMC, they have a very good lab and may indeed offer degree work. I noticed
your LinkedIn profile shows you as being about 5
All,
Differences between EEC, EC, and EU.
Upon the entry into force of the Maastricht Treaty in 1993, the EEC was
renamed the European Community (EC) to reflect that it covered a wider range
of policy. This was also when the three European Communities, including the
EC, were collectively
Derek,Have you stopped all data clocks? This may tell you is the noise is from an external source.If you have done this and still have a high RE, I would suggest your entire setup has become a 1/4 stub antenna for something external It is apparently optimized for near 200 MHz or some
Sorry to be so verbose, there is one other idea.If you have placed ferrite on the cable , try moving it up and down the length of the cable. Using the idea of an antenna, it is possible you have place the ferrite in an ineffective point. A null in the wavelength. -doug
All,John's comment about "improved", devices prompted a thought. Often these so called improvements involve making devices faster and more efficient. This speed increase has to do with reverse recovery times of diodes and storage time of switching transistors (slew rates). The reciprocal of 200
Lauren,
I would say this is an internal designation, specific to your client. Not an
uncommon thing. It may be they have a design manual intended for their
suppliers to use and explains all these acronyms.
thanks, –doug
Douglas E Powell
http://www.linkedin.com/in/dougp01
From: Crane,
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