[PSES] JOB OPPORTUNITY - CT

[Mike Cantwell]

Hi all,

Below is an excerpt from a job opportunity from a recruiter. Please contact Joe 
Szlosek, directly, at j...@jasrecruitment.com<mailto:j...@jasrecruitment.com> 
if you are interested.


Senior Regulatory & Compliance Engineer

This role is located in Connecticut.  Relocation assistance is available.

Candidates must have experience in new product development, regulatory 
compliance and electrical products or software/firmware.

The preferred candidate will be highly motivated with demonstrated initiative, 
and have a fundamental understanding of product design and development 
methodologies within a regulated environment.


Good luck.

Regards,
Mike






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[PSES] Job Opening - Sr. Compliance Engineer - Dallas, TX

[Mike Cantwell]

Hi all,

I’m posting this on behalf of a recruiter, Jack Dowdell, looking to fill a Sr. 
Compliance Engineer position in the Dallas, TX area. If you have an interest in 
this position, please make contact directly through the link found at the 
bottom of the job description at the url below.

http://www.bullhornreach.com/sites/scr/job/2191613_senior-compliance-engineer-dallas-tx

Regards,
Mike






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[PSES] EN 61000-3-3:2013

[Mike Cantwell]

EN61000-3-3 is transitioning from the 2008 to 2013 next June. Has anyone gone 
through this and identified any major changes since the 2008 edition?

Is a retest in order for existing equipment? 

Regards, 
Mike

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Re: [PSES] Estonian Standards MultiUser License

[Mike Cantwell]

Hi Brian,

I recently purchased a multi-user (2) license for Estonian standards. I've 
opened them on more than one computer with no issues. It, however, would not 
download from an intranet site. Opening from a directory from multiple 
computers seems to work fine. 

Regards, 
Mike

> On Mar 4, 2015, at 9:54 AM, Kunde, Brian  wrote:
> 
> Please forgive me if this is a repeat.
>  
> Does anyone have experience buying Standards from Estonia using the MultiUser 
> Licence? Do they still use FileOpen to control what computers can open the 
> files like they do with a single user license or do they have a way of 
> limiting how many different computers can open the files at one time?
>  
> I would like to put the standards files on our Intranet server so those in 
> R&D can reference then when needed.  We may have 20 engineers who may 
> reference a standard it would be rare that more than 2 would ever open the 
> files at the same time.
>  
> I’m trying to figure out how their MultiUser License system works so I can 
> purchase the right number of users.
>  
> Does anyone have experience with this?
>  
> Is there a better solution or cheaper source for EN standards?
>  
> Regards,
>  
> The Other Brian
> LECO Corporation Notice: This communication may contain confidential 
> information intended for the named recipient(s) only. If you received this by 
> mistake, please destroy it and notify us of the error. Thank you.
> 
> -
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[PSES] Japan PSE approved Power Cords

[Mike Cantwell]

Hi all,
The PSE mark (inside a diamond shape) for Japan does not apply to IT equipment 
that has an internal power supply. For IT equipment with an external power 
supply, only the external power supply must have the PSE mark. The category "A" 
list of items for "Electrical Appliances and Materials" lists cords and cables, 
appliance connectors, as well as other descriptors that would infer that AC 
power cords would require the PSE mark.
The question I have is related to a PSE approved power cord: If a properly 
rated, PSE approved power cord is provided with a rack-mount computer (server) 
shipped from the US to Japan, is there a warning that must accompany the power 
cord stating something like "The attached power cable is only for this product. 
Do not use the cable for any other product."
This "warning" seems counter-intuitive as a PSE mark would mean it is suitable 
for use. Has anyone been asked to provide a similar warning in Japan? I would 
be interested to hear about any experiences requiring a warning for an approved 
power cord.
Regards,Mike
  
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[PSES] Job Opening

[Mike Cantwell]

I had a recruiter contact me about a position for a Sr. Manager Global Product 
Safety and Compliance position at Bissell. The url describing the position is:

https://www.candidatecare.com/srccsh/RTI.home?r=501942010&c=35&d=bissell.candidatecare.com&_dissimuloSSO=ijsc47EXsJI:cvVDW3Ulycwf8v5MgUQgtYh8qCA
 
<https://www.candidatecare.com/srccsh/RTI.home?r=501942010&c=35&d=bissell.candidatecare.com&_dissimuloSSO=ijsc47EXsJI:cvVDW3Ulycwf8v5MgUQgtYh8qCA>

If you are interested in this position, please contact the recruiter, Lara 
Heacock, directly at lara.heac...@adp.com <mailto:lara.heac...@adp.com> as I 
have no affiliation with the recruiter. I just like to pass on opportunities I 
am aware of for those that might be looking for new opportunities.

Regards,
Mike






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Re: [PSES] FCC listing of test facility

[Mike Cantwell]

The requirements are in 2.948

Go to www.ecfr.gov and then choose Title 47, Telecommunication; browse parts 
0-19; click on part 2; scroll down and fid 2.948 and voila, you're there. 

Regards, 
Mike

> On Oct 7, 2014, at 7:44 AM, Paolo Roncone  wrote:
> 
> Hi all,
> 
> can anyone help me find the right path to follow for applying for FCC 
> registration (or listing) of a test site facility ?
> I started in www.fcc.gov, but then I got lost and putting "test site listing" 
> and the like in the search engine didn't bring up anything useful. May be the 
> terminology is changed?
> 
> Thanks!
> Paolo
> -
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Re: [PSES] Symbols for CCC Approval

[Mike Cantwell]

Hi Scott,

This requirement comes from the National Differences published in the CB 
Bulletin. If the product is ITE, then clause 1.7.2.1 was modified. It is 
acceptable to provide the Chinese translation of the statements below as well 
as to use the icons. I can provide the translation if you email me directly. 
China doesn’t provide nice graphics for the symbol, you have to pull them right 
out of the CB report.

Add requirements of warning for equipment intended to be used at altitude not 
exceeding 2000m or at non-tropical climate regions:

For equipment intended to be used at altitude not exceeding 2000m, a warning 
label containing the following or a similar appropriate wording, or a symbol as 
in annex DD shall fixed to the equipment at readily visible place.

"Only used at altitude not exceeding 2000m."  



For equipment intended to be used in not-tropical climate regions, a warning 
label containing the following or a similar appropriate wording, or a symbol as 
in annex DD shall fixed to the equipment at readily visible place.

"Only used in not-tropical climate regions.”
  

If only the symbol used, the explanation of the symbol shall be contained in 
the instruction manual.

The above statements shall be given in a language acceptable to the regions 
where the apparatus is intended to be used.

Regards,
Mike





On 30-Sep-2014, at 5:13 PM, Scott Douglas  wrote:

> Hello all,
> 
> I am being asked to add two symbols to my product silkscreen for CCC 
> Approvals.
> 
> One symbol is a not circle with waves at the bottom (water) and curled lines 
> above (moisture I guess). This is to signify not for use in tropical regions.
> 
> The second symbol is a circle with mountains and <=2000m inside it. This 
> signifies use only below 2,000 meters in altitude.
> 
> Can anyone tell me where these two symbols come from (standards reference) 
> and where one can get vector artwork for same?
> 
> Thank you in advance for any help provided.
> 
> Scott
> 
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Re: [PSES] Buying Standards

[Mike Cantwell]

Hi all,

I have received many responses which I will summarize here. As with all things, 
there are pros & cons to consider, as well as different needs of an enterprise. 
The realities of copyright, licensing, web availability, share point posting, 
etc should definitely be considered before an organization selects where and 
how to purchase standards as they can and should influence the decision. The 
question being answered here is a basic one of cheapest cost, without much 
consideration of other parameters.

One of the first things to be discovered when looking for the same versions of 
standards across multiple sellers is that you need to have a complete 
understanding of exactly what standard you’re looking for, including prefixes 
and amendments. The IEC version versus the EN version is the best example. The 
EN version typically provides a description of differences to the IEC version 
and then incorporates the full text of the IEC version. This may or may not 
meet your particular needs. But it is important to know what you’re looking for.

The other thing discovered is that some offer the consolidated versions and 
some offer the base standard plus amendments. Again, depending what you need to 
use, this is a very important consideration. If I were working in a lab and 
needing to refer to the standards on a daily basis, I would probably prefer the 
consolidated version. But, the cheapest standards did not always include a 
consolidated version. So the question has to be asked, what’s more important to 
me, cheap or consolidated? 

It was difficult to match exact versions with identical amendments. In some 
instances, I selected the latest version of a standard as it was only a few 
dollars more than the required referenced standard. The costs, however, are 
fairly representative for the results shown.

I used a very narrow search criteria. I was looking for the EN versions of the 
EMC standards for ITE and the IEC version of 60950-1. The resources that I 
received from a multitude of members on this list are below. Cheapest is #1, 
most expensive is #7, and useless to me was #8. One last comment, Some of these 
vendors are reselling standards from other standards bodies and provide other 
places to search if this list does not meet your needs. I think you could make 
a mini-career of finding who has the best deal for what (Although I think 
Estonia has pretty much provided the most bang for the buck, IMHO).

1  Estonia   http://www.evs.ee/shop 9%
2  Denmark   http://www.ds.dk/en   38%
3  Luxembourg ILNAS  https://ilnas.services-publics.lu/ecnor/home.action   43%
4  Global IHShttps://global.ihs.com56%
5  Techstreethttp://www.techstreet.com 89%
6  BSI   http://shop.bsigroup.com/Navigate-by/Standards/   93%
7  ANSI Storehttp://webstore.ansi.org 100%
8  DocumentCenterhttps://www.document-center.com   ---

The most expensive was the ANSI store, so it is shown as 100% or highest cost. 
Cheapest was Estonia at 9% of what the ANSI store charges. So, in conclusion, 
there is a 10 to 1 difference in the cost of standards, depending on where you 
shop and what you need. 

Regards,
Mike





On 23-Sep-2014, at 9:17 PM, Mike Cantwell  wrote:

> Hi all,
> 
> I have to buy a whole bunch of standards, mostly EN but also a few IEC 
> standards. I’m familiar with BSI and IHS Global, what are the other sources 
> of these standards? and which sources have the lowest prices? I’ll check out 
> any responses I receive and will post a summary list with a rating for cost. 
> I’m sure that more people than just I would be interested in knowing where 
> they can get the most bang for their buck.
> 
> Regards,
> Mike
> 
> 
> 
> 
> 

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[PSES] Buying Standards

[Mike Cantwell]

Hi all,

I have to buy a whole bunch of standards, mostly EN but also a few IEC 
standards. I’m familiar with BSI and IHS Global, what are the other sources of 
these standards? and which sources have the lowest prices? I’ll check out any 
responses I receive and will post a summary list with a rating for cost. I’m 
sure that more people than just I would be interested in knowing where they can 
get the most bang for their buck.

Regards,
Mike






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Re: [PSES] Routine HiPot Testing

[Mike Cantwell]

Many thanks Rich. I thought it would be 3,000 Vrms. That would be 4,243 Vdc! 
That is a far cry from what our procedure says now. These numbers are in line 
with what's in our CB reports as well. Oh well, what's another ECO among 
friends 😊

Regards, 
Mike

> On Aug 6, 2014, at 5:41 PM, "Richard Nute"  wrote:
> 
> 
> 
> Hi Mike:
> 
> 
> For a peak working voltage of 340 (240 rms), the routine test 
> (Table 5B) is 3000 V rms for 1 second between mains and ground.  
> (You do not have a peak working voltage exceeding 420 so Table 
> 5B Part 2 does not apply.)
> 
> If you apply Table 5C, you must determine required withstand 
> voltage according to G.4 and G.2.  You will likely end up with 
> the required withstand voltage equal to the mains transient 
> voltage, Table G.1, 2500 V peak.
> 
> According to Table 5C, if the required withstand voltage is
> 2500 V peak, the test voltage for reinforced insulation is 
> 5000 V peak (3536 rms).  This voltage can be reduced by 10%
> to 4500 V peak (3182 rms). 
> 
> So, you have a choice of 3000 V rms or 3182 V rms for 1 second. 
> 
> 
> Best regards,
> Rich
> 
> 
> 
> 
>> On 8/6/2014 1:09 PM, Mike Cantwell   wrote:
>> This seemed to me to be a simple question, but it's turned out to be one 
>> with different answers from the experts, so I'm confused. Reading section 
>> 5.2.2 of 60950-1, seems to say that an ITE product (computer server 
>> specifically) that is Overvoltage Category II can use table 5B to determine 
>> the test voltage, which is listed at 3,000 Vrms for reinforced insulation 
>> for an ac mains of 240 Vrms (340 Vpk). I understand that the working voltage 
>> in the power supply can exceed this value and many of our CB reports 
>> definitely show this, but the test voltage remains at 3,000 Vrms regardless.
>> 
>> Further along in section 5.2.2, it says that for routine tests, the duration 
>> of the electric strength test can be dropped to 1 second and the test 
>> voltage of Table 5C (different table) can be reduced by 10%. But this table 
>> seems to imply that I can reduce the 3,000 V to a test voltage of 2,700 Vrms.
>> 
>> Now table 5B (Part 2), for 340 V, the test voltage is 2,328 Vrms. If I 
>> reduce this voltage by 10%, the test voltage is 2,095 Vrms. If I want to do 
>> a DC hipot, the test voltage would becomes 2,963 Vdc. 
>> 
>> I have been given numbers everywhere from 1500 V to 3000 V, and I'd like to 
>> know what the proper test level should be. Is a different test level 
>> determined for every power supply based on working voltage for routine 
>> tests? or can one test level be determined and used for all hipot testing.
>> 
>> As an EMC guy, the range I've been given by the safety folks is only 6 dB 
>> different and quite within the measurement uncertainty :) but something 
>> tells me that the safety folks will have a better number for the test levels 
>> and know the proper way it is derived. 
>> 
>> I would like to set the hipot testers to a single value if at all possible. 
>> Any help would be greatly appreciated on what the test level should be for a 
>> routine hipot on a computer.
> 

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[PSES] Routine HiPot Testing

[Mike Cantwell]

This seemed to me to be a simple question, but it's turned out to be one with 
different answers from the experts, so I'm confused. Reading section 5.2.2 of 
60950-1, seems to say that an ITE product (computer server specifically) that 
is Overvoltage Category II can use table 5B to determine the test voltage, 
which is listed at 3,000 Vrms for reinforced insulation for an ac mains of 240 
Vrms (340 Vpk). I understand that the working voltage in the power supply can 
exceed this value and many of our CB reports definitely show this, but the test 
voltage remains at 3,000 Vrms regardless.
Further along in section 5.2.2, it says that for routine tests, the duration of 
the electric strength test can be dropped to 1 second and the test voltage of 
Table 5C (different table) can be reduced by 10%. But this table seems to imply 
that I can reduce the 3,000 V to a test voltage of 2,700 Vrms.
Now table 5B (Part 2), for 340 V, the test voltage is 2,328 Vrms. If I reduce 
this voltage by 10%, the test voltage is 2,095 Vrms. If I want to do a DC 
hipot, the test voltage would becomes 2,963 Vdc. 
I have been given numbers everywhere from 1500 V to 3000 V, and I'd like to 
know what the proper test level should be. Is a different test level determined 
for every power supply based on working voltage for routine tests? or can one 
test level be determined and used for all hipot testing.
As an EMC guy, the range I've been given by the safety folks is only 6 dB 
different and quite within the measurement uncertainty :) but something tells 
me that the safety folks will have a better number for the test levels and know 
the proper way it is derived. 
I would like to set the hipot testers to a single value if at all possible. Any 
help would be greatly appreciated on what the test level should be for a 
routine hipot on a computer.
  
-

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Re: [PSES] Equipment rack for GR1089 testing - does it have to be metal?

[Mike Cantwell]

Hi Nevin,

 

The rack requirement is not in GR-1089. It is a supplemental Verizon document

 

http://www.verizonnebs.com/TPRs/VZ-TPR-9305.pdf

 

Regards,

Mike

 

From: Neven Pischl [mailto:neve...@comcast.net] 
Sent: Tuesday, November 19, 2013 7:07 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Equipment rack for GR1089 testing - does it have to be metal?

 

Hello All,

Is there a formal requirement, by either Telcordia/NEBS or by the major telecom 
carriers that the equipment rack (i.e. not the cable rack) be metal, when 
testing radiated immunity per the GR1089? I understand it is the usual practice 
- I have only seen such tests with a metal rack -  but I am asking if there is 
such a requirement spelled out anywhere. I can't find it in GR1089.

If any on this list knows of it, please can you forward the document, at least 
maybe a snapshot of the relevant paragraph along with the reference if the 
document can't be forwarded.

Thank you, Neven

-


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Job Opportunity - Dallas, TX

[Mike Cantwell]

Nemko has an open position for a Sales Person out of our Texas location. 
Technical background is not necessary, we're looking for someone who likes
to work with customers, new and existing, and is comfortable on the phone. 

If you are interested or know someone who is interested, please contact me
directly using the contact info below.


Thanks,
Mike Cantwell
Nemko USA
802 North Kealy Ave
Lewisville, TX
Tel: 972-436-9600 x273
Fax: 972-436-2667
email: mike.cantw...@nemko.com
url: www.nemko.com

-

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RE: Job Opportunity - Maryland

[Mike Cantwell]

I've been getting quite a few emails regarding "age discrimination" regarding
the email below. Just so it's known, the recruiter did not place this
requirement on the job, nor did I. The requirements are poorly written, no
question.
 
My intent was to allow someone the opportunity to gain employment and feed
their family.
 
The requirements seem to be the result of a conversation, not a legal
briefing. I have no idea who the company is, nor do I care, but for the sake
of those in the midst of a job search, they are who this was intended for. 
 
I will certainly edit the next request I get and provide less information than
I did this time, but I think it's important to take this email for what it
was, trying to help someone get a job.
 
Thanks,
Mike
 
 
 - Original Message ----- 

From: Mike Cantwell <mailto:mcantw...@leapfroginet.com>  
To: Emc-Pstc <mailto:emc-p...@majordomo.ieee.org>  
Cc: Bryan Axmear <mailto:bryan_axm...@oxfordcorp.com>  
Sent: Wednesday, October 15, 2003 12:22 PM
Subject: Job Opportunity - Maryland


I received the following job opportunity from this recruiter:
 
 <mailto:bryan_axm...@oxfordcorp.com> bryan_axm...@oxfordcorp.com
 
He has helped others on this list find employment in the past so if anyone is
interested in this position or knows of someone interested in this position
either contact him directly or you can contact me and I'll help them get
through.
 
Looks like the emphasis is on design and analysis and not on testing. For
whatever reason, age seems to matter, I'm sure to reflect salary versus
experience. Good luck to those interested.
 
Job Description:
 
I need a emi/emc ANALYSIS/DESIGN (opposed to a straight test) guy that
graduated from college between the years of  1988-1992. Job in maryland. 
Emi analysis, pspice, mathcad, RF work of any kind.
 
t1) a graduate that didnt graduate any earlier than 1986
2) the candidate knows that my manager may want to make him an offer after 9
months for perm placment
3) it is emc/emi analysis and design instead of straight emi/emc testing
 
 
 

RE: Job Opportunity - Maryland

[Mike Cantwell]

Wow,
 
This was LOUD !!! 
 
Point taken.
 
Original purpose: Help someone feed their family. 
 
Or, in your words:
 
Feed their family !!!

 
 
 
 -Original Message-
From: Price, Ed [mailto:ed.pr...@cubic.com]
Sent: Wednesday, 15 October, 2003 4:52 PM
To: 'Tyra, John'; 'Mike Cantwell'; Emc-Pstc
Cc: Bryan Axmear
Subject: RE: Job Opportunity - Maryland


I don't think asking the age on an employment application is prohibited;
however, it invites suspicion and leaves a paper trail that may haunt you.
Defining a college graduation date is odd, and appears to be a silly way to
gauge the applicant's age. (Really, was EE course content so much different in
1985 versus 1987?) If we assume a reasonable progression of educational
experience, a typical engineer would graduate at age 22 in 1986; thus, there
appears to be an age cutoff of 39.
 
Here's a free legal opinion, for California (and if you don't like it, sue
this lawyer):
 
People under forty years old are not protected by age discrimination in the
workplace laws. If an employer refuses to hire somebody because he or she is
thirty-nine, and therefore "too young", that is not illegal. But if it because
he or she is forty and "too old", that is illegal.
 
http://www.discriminationattorney.com/age.html
 
You can dig deeper at:
 
http://www.hr-guide.com/data/073.htm
 
And for the, uhhh, horse's mouth, see:
 
http://www.dol.gov/oasam/regs/statutes/age_act.htm
 
Is it too quaint to prefer a "good" applicant rather than a specific "age"
applicant?
 
Ed
 

Ed Price 
ed.pr...@cubic.com WB6WSN 
NARTE Certified EMC Engineer & Technician 
Electromagnetic Compatibility Lab 
Cubic Defense Systems 
San Diego, CA  USA 
858-505-2780  (Voice) 
858-505-1583  (Fax) 
Military & Avionics EMC Is Our Specialty 


From: Tyra, John [mailto:john_t...@bose.com]
Sent: Wednesday, October 15, 2003 11:07 AM
To: 'Mike Cantwell'; Emc-Pstc
Cc: Bryan Axmear
Subject: RE: Job Opportunity - Maryland


I thought asking a persons age on a job application for employment is
illegalyes


From: Mike Cantwell [mailto:mcantw...@leapfroginet.com] 
Sent: Wednesday, October 15, 2003 12:22 PM
To: Emc-Pstc
Cc: Bryan Axmear
Subject: Job Opportunity - Maryland



I received the following job opportunity from this recruiter:
 
 <mailto:bryan_axm...@oxfordcorp.com> bryan_axm...@oxfordcorp.com
 
He has helped others on this list find employment in the past so if anyone is
interested in this position or knows of someone interested in this position
either contact him directly or you can contact me and I'll help them get
through.
 
Looks like the emphasis is on design and analysis and not on testing. For
whatever reason, age seems to matter, I'm sure to reflect salary versus
experience. Good luck to those interested.
 
Job Description:
 
I need a emi/emc ANALYSIS/DESIGN (opposed to a straight test) guy that
graduated from college between the years of  1988-1992. Job in maryland. 
Emi analysis, pspice, mathcad, RF work of any kind.
 
t1) a graduate that didnt graduate any earlier than 1986
2) the candidate knows that my manager may want to make him an offer after 9
months for perm placment
3) it is emc/emi analysis and design instead of straight emi/emc testing
 
 
 

Job Opportunity - Maryland

[Mike Cantwell]

I received the following job opportunity from this recruiter:
 
  bryan_axm...@oxfordcorp.com
 
He has helped others on this list find employment in the past so if anyone is
interested in this position or knows of someone interested in this position
either contact him directly or you can contact me and I'll help them get
through.
 
Looks like the emphasis is on design and analysis and not on testing. For
whatever reason, age seems to matter, I'm sure to reflect salary versus
experience. Good luck to those interested.
 
Job Description:
 
I need a emi/emc ANALYSIS/DESIGN (opposed to a straight test) guy that
graduated from college between the years of  1988-1992. Job in maryland. 
Emi analysis, pspice, mathcad, RF work of any kind.
 
t1) a graduate that didnt graduate any earlier than 1986
2) the candidate knows that my manager may want to make him an offer after 9
months for perm placment
3) it is emc/emi analysis and design instead of straight emi/emc testing
 
 
 

RE: Load Cells for Radiated Susceptibility Testing

[Mike Cantwell]

Goto http://www.vishay.com/load-cells/

Vishay has pretty much bought everyone that makes load cells. Tedea
Huntleigh is the most well known. As far as using them in a harsh
environment, the signals are differential with shielded cables. I know they
work quite well up to 10 or 20V/m, but I don't have experience with them
above that. I'd be interested to hear more.




From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Donnelly, Thomas
Sent: Monday, 22 September, 2003 12:56 PM
To: 'emc-p...@majordomo.ieee.org'
Subject: Load Cells for Radiated Susceptibility Testing



Group,

I have an application where I need to load an actuator, and monitor the
load, during EMI testing. I have to meet DO-160D, and MIL-STD-461E, which
will include 200 V/m Radiated Susceptibility.

Has anyone had experience using load cells in this environment? Any
suggestions on vendors?

Thanks,
Tom Donnelly
Smiths Aerospace Actuation Systems
tdonnelly@act-sys



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RE: Synchronizing DC-DC converters to reduce emissions?

[Mike Cantwell]

If all the supplies have a switching frequency within a few kilohertz of
each other, and the resolution bandwidth of the measurement is 9 kHz, it
seems to me that the power bandwidth of the measurement doesn't depend on
the synchronization and that you'll obtain the same reading either way.

I believe the value to synchronization (for EMC) is that the broadband noise
can be less. Good layout and "snubbing" are still the dominant controls for
EMC in power supplies.

Just my humble opinion.




From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Pat Lawler
Sent: Wednesday, 30 July, 2003 9:31 AM
To: EMC-PSTC
Subject: Synchronizing DC-DC converters to reduce emissions?



We are designing a switching power supply for a customer that has
multiple outputs.  Due to the tight regulation requirements, all
outputs have their own PWM modulators and control loops.

The customer feels the RF emissions (as measured by CISPR 11) will be
reduced by synchronizing the frequencies of all the converters.  I
think synchronizing the PWM sections will make the total power supply
emissions as high as possible (emissions are coherent?).

1) What has been your experience with controlling noise from multiple
switching power supplies?  Is synchronizing a good idea?

2) If the supplies are synchronized, would a phase shift between
converters (avoiding simultaneous switching of all converters) help?

Thanks,
---



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FW: NARTE safety engineer certification

[Mike Cantwell]

Gregg,

My intention was certainly NOT to inflame. My sincere, whole-hearted
apology. Your time, effort, and financial committment to creating/providing
a certification for safety engineers will certainly be appreciated by all. I
certainly appreciate it. This is a noble committment and a noble cause.

Uninformed, I certainly was (and I don't think I was alone). Until I
received this email from you, I did not know this was taking place. I
appreciate your detailed description of what has been going on with eGlobal
Education Partnership, as I'm sure many others on this list are interested
as well. Apparently, others have inquired, and also received no response or
acknowledgement, from you or NARTE. Once again, no flame intended.

As far as "uninformed liable" is concerned, I believe this to be an
oxy-moron. Liable involves some kind of malicious intent to destroy which
was definitely not the case. Might I suggest, since you are preparing a
workshop for the IEEE in Boston, that you provide some details to this list,
so that we all might be informed. Lack of communication and information
always seems to cause problems, while having information leads to confidence
and assurance.

I believe we all would benefit from information you have on this program. I
hope that you can provide some for our benefit.

I also hope that you accept my public apology, there was never any flame
intended. If not, please feel free to contact me off-line to resolve the
issue.

Thanks,
Mike Cantwell, PE, NCE
Cantwell Engineering LLC
1232 Rio Grande Dr.
Allen, TX 75013
Tel: (214) 547-1666
Cell: (469) 831-8701
mailto:mcantw...@ieee.org or
mailto:mcantw...@leapfroginet.com
AIM: CantwellEMC




From: Gregg Kervill [mailto:gr...@test4safety.com]On Behalf Of
gr...@eglobaled.org
Sent: Wednesday, 09 July, 2003 12:17 PM
To: 'Mike Cantwell'
Cc: ri...@ieee.org; j.bac...@ieee.org
Subject: RE: NARTE safety engineer certification
Importance: High


Mike,

The word HOAX is more than a little inflammatory - and when used against a
legitimate IRS certified 501 (c) (iii) legal issues are raised.



For your information:-
* I have been working with NARTE on this safety engineer certification
project since the mid 90's
* I formed the non-profit (eGlobal Education Partnership) at considerable
cost and nine months of legal negotiations with the IRS - it has become
extremely difficult to get the (c)(iii) designation.
* I have created a board that includes the Director of a key US government
institute plus and members of large corporations and government departments
in the US - New Zealand - China and elsewhere - I am sure that this group -
who are devoting their time for the advancement of you and others will be
delight to be branded as participants in a HOAX publicly by you.
* I am currently developing free regulatory training material that will be
hosted on the eGlobal Education Partnership site - for the betterment of
engineers world-wide

In short I have put several thousand hours of my time PLUS many thousands of
dollars into developing eGlobal and do not intend to let it be destroyed by
uninformed liable.


I believe that a PUBLIC apology would be a good starting place.



Gregg Kervill DipIM, MIMgt, MIEEE
Member of IEEE-EMCS Education Committee
Member of World Congress on IT committee (WCIT2006.org)



From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Mike Cantwell
Sent: Wednesday, July 02, 2003 9:32 AM
To: Emc-Pstc
Subject: RE: NARTE safety engineer certification


I responded to the website below (which does not seem to be related to
NARTE) and also got no response. I do believe this is a HOAX.



From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Peter L. Tarver
Sent: Wednesday, 02 July, 2003 7:03 AM
To: 'emc-pstc'
Subject: NARTE safety engineer certification



Out of curiosity, I wrote NARTE directly regarding the
below, to see what benefit they believe NARTE certification
would offer someone who already has experience in product
safety and a PE Registration.  It's been a week and they
have not responded.  Perhaps that's their answer.


Regards,

Peter L. Tarver, PE
Product Safety Manager
Sanmina-SCI Homologation Services
San Jose, CA
peter.tar...@sanmina-sci.com

> From: gr...@test4safety.com
> Sent: Tuesday, June 24, 2003 2:48 PM
>
> It's also worth noting that NARTE will begin the
Grandfathering
> phase for their Certified Product Safety
Engineer/Technician
> award: you can get more information by registering on the
> 501(c)(iii)  (Charity) site of www.eGlobalEd.Org
>
> Best regards
>
> Gregg



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RE: NARTE safety engineer certification

[Mike Cantwell]

I responded to the website below (which does not seem to be related to
NARTE) and also got no response. I do believe this is a HOAX.



From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Peter L. Tarver
Sent: Wednesday, 02 July, 2003 7:03 AM
To: 'emc-pstc'
Subject: NARTE safety engineer certification



Out of curiosity, I wrote NARTE directly regarding the
below, to see what benefit they believe NARTE certification
would offer someone who already has experience in product
safety and a PE Registration.  It's been a week and they
have not responded.  Perhaps that's their answer.


Regards,

Peter L. Tarver, PE
Product Safety Manager
Sanmina-SCI Homologation Services
San Jose, CA
peter.tar...@sanmina-sci.com

> From: gr...@test4safety.com
> Sent: Tuesday, June 24, 2003 2:48 PM
>
> It’s also worth noting that NARTE will begin the
Grandfathering
> phase for their Certified Product Safety
Engineer/Technician
> award: you can get more information by registering on the
> 501(c)(iii)  (Charity) site of www.eGlobalEd.Org
>
> Best regards
>
> Gregg



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RE: ESD - not applicable ?

[Mike Cantwell]

I think this raises the difference between what's really required BY LAW and
what is good engineering practice, or QUALITY. Although I personally am always
for high quality and therefore perform tests above and beyond whenever I can,
there are numerous instances where this is not prudent. 
 
Quality versus Regulatory Requirement = You'd like to do it versus you have to
do it
 
I do believe that I've seen some blood spattered on this list by those who
could not differentiate between these two. I certainly know that I'm missing a
pint or two...
 
If the standard doesn't say it, then it isn't so. The limits the limit. And my
personal favorite: We won't get caught.
 
Quality versus Regulatory Requirement... Engineers versus Lawyers.
 
OK, I'll stop now.
 


From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of richwo...@tycoint.com
Sent: Monday, 23 June, 2003 2:05 PM
To: emc-p...@majordomo.ieee.org
Subject: RE: ESD - not applicable ?


Clause 8.3.1 of EN 61000-4-2 says "The static electricity discharges shall be
applied only to such points and surfaces of the EUT which are acessible to
personnel during normal usage."  And it also says "The application of
discharges to any point of the equipment which is assessible only for
maintenance purposes, excluding customer's maintenance, is not allowed unless
different prescription is given in the dedicated product specification."
 
So, unless the product or family spec says otherwise, no testing is required
if a product is touched only during maintenance other than customer
maintenance.
 
Richard Woods 
Sensormatic Electronics 
Tyco International 


From: Pettit, Ghery [mailto:ghery.pet...@intel.com]
Sent: Monday, June 23, 2003 2:59 PM
To: am...@westin-emission.no; emc-p...@majordomo.ieee.org
Subject: RE: ESD - not applicable ?



Amund,

 

CISPR 24 (and EN 55024) provides reasons to not perform various tests, but ESD
doesn’t have any of these “outs”.  I think you are entirely correct in
wanting the test done.  Like you, I have seen this to be one of the more
applicable immunity tests (along with surge) and we test to higher levels, too.

 

Did the lab explain how the equipment would be installed, if not touched by
human hands?

 

Ghery S. Pettit

Intel Corporation

 

 


From: am...@westin-emission.no [mailto:am...@westin-emission.no] 
Sent: Monday, June 23, 2003 11:29 AM
To: emc-p...@majordomo.ieee.org
Subject: ESD - not applicable ?

 

ESD has always been in my view, one of the most applicable EMC tests . We
tests all our products with higher levels than stated in the standards.

 

Last week I visited a local test lab and they told me that " . you do not
need to ESD test your new equipment because it will not be operated (no keys
to press) by humans or not accessible for humans (installed minimum 2.5m above
the floor level) .". Well, I was a bit surprised, because you can easily
climb up to it and during maintenance you may touch it.

 

So, what's your interpretation for ESD and situation where it is not
applicable?  We'll carry out the ESD test anyway, because I have no intention
to discuss this case with a number of world-wide certification bodies. 20
minutes testing and all parts are satisfied ... if it pass .

 

 

Best regards

Amund Westin, Oslo / Norway

RE: Question about OATS

[Mike Cantwell]

Tim,
 
The best advice is to set up the chicken wire as a ground plane and take full
sets of NSA. Perform these measurements just as if you were on the completed
site, including keeping yourself and your measurement equipment out of the
ellipse. If you don't meet NSA, then re-orient the site and do it again until
you do.
 
Once you get good data, build the site in that spot in that orientation. If
you can't get good data, then it might be career limiting to put a site there.
Fix the problems BEFORE you invest in the site.
 
Keep in mind that the building you put up to house the people doing the
testing may interfere with the NSA in the final version. Rent a U-Haul and
park it where the building will end up. If that big hunk of metal still lets
you obtain good NSA data, then the building should be OK too.
 
Take the measurements and don't guess, a good site survey runs rings around
guessing and conjecture. Also, once you determine the site is OK, take the
time to perform an ambient survey and drive around the area to see what's
there. There may be other gotchas!
 
And just to stress the importance, take measurements, take measurements, and
take measurements. 
 
Good Luck,
Mike


From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of emcp...@aol.com
Sent: Wednesday, 18 June, 2003 6:13 PM
To: emc-p...@majordomo.ieee.org
Subject: Question about OATS


Hello,

I'm building an open area test site, and have some questions about the ellipse
and ground plane.  I'm following ANSI C63.7:1992.  I have used several OATS
and done site attenuation before, but this is the first time building one from
the ground up.

I'm building a 10 Meter OATS with a 14 foot turntable.  Figure 1 in ANSI C63.7
says that the minor diameter of the ellipse shall be 17.3 Meters and the major
diameter shall be 20 meters for a 10 meter site.

For the ground plane, Table 1 in ANSI C63.7 says for a 10 meter site, the
width shall be 12 meters and the length shall be 15.3 meters.  The corners of
the ground plane will be outside the ellipse.  Is this ok, or should the
ground plane be smaller, to fit inside the ellipse?  What would be the minimum
ground plane size I could use for this 10 meter site with a 14 foot turntable?

Also, there is a chain-link fence running parallel with the proposed site, but
the fence is just outside the ellipse.  Would there be any problems with site
attenuation?  I can alter the ellipse so the site is not exactly parallel with
the fence.  (Antenna would be somewhat diagonal to the fence)  Would that help
avoid any problems?

Thanks in advance for any input you may have.

Tim Pierce
EMC Engineer 

JOB - WA State - PCB Layout

[Mike Cantwell]

All,

I have been speaking to a recruiter that has a current need for 2 PCB
designers in the WA state area. He is looking for experience with medical
products. If anyone is interested or knows of some board designers that
would interested, this contract could last about 18 mos. I don't have any
more details than this.

Forward your resume to me and I'll pass it on to the recruiter, who so far
has had a good track record of responding. Why am I helping a recruiter? I'm
hoping to find something for myself in the Dallas area.

Thanks,
Mike Cantwell, PE, NCE
Tel: (214) 547-1666
Cell: (469) 831-8701
mailto:mcantw...@ieee.org or
mailto:mcantw...@leapfroginet.com
AOL Instant Messenger: CantwellEMC



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Job - Washington State

[Mike Cantwell]

Hi all,

I have been speaking with a recruiter who currently has a 2 year contract
position available in the Washington state area. This is for a medical
company that needs to upgrade it's products to the new version of EN 60601.
Sory, I don't have anyother information than that.

If anyone's interested, contact me offline with your contact info and I'll
make sure it gets to the recruiter, who is retained by the company looking
to fill this position.

2 years might help someone survive into a better economy

Thanks,
Mike Cantwell
1232 Rio Grande Dr.
Allen, TX 75013
Tel: (214) 547-1666
Cell: (469) 831-8701
mailto:mcantw...@ieee.org or
mailto:mcantw...@leapfroginet.com
AOL Instant Messenger: CantwellEMC



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RE: Real product interference source at 121 MHz

[Mike Cantwell]

I recall that the FCC found a problem in this frequency range in the
Northwest a few years ago that was related to powerlines. 

Of course, a directional antenna, spectrum analyzer, and a van would be
useful...



From: Kurt Fischer [mailto:kurt.fisc...@hyperinterop.com]
Sent: Tuesday, February 11, 2003 9:03 AM
To: emc-p...@majordomo.ieee.org
Subject: Real product interference source at 121 MHz


Hello all,
 
A strange request but this has become an interference issue with a sattelite
communications link There seems to be a very strong interferer at 121 MHz
that is intermittent in nature and physically located in Northern
USA/Canada. 
 
It could be the marketing of a non-compliant consumer products or perhaps
some after market sattelite rec. retro-fit kit??
 
Has anyone else had this experience in the last year --- (the problem was
not present 2 years ago)?
It does appear to getting worse and is spreading geographically as well.
 
Regards,
Kurt Fischer
Hyper Corp
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u֯z֭ah%̪-ݙbrtۭzxy+!zi^'z!  p{{^+bwWr-r,)౪j!jwly܅zma0rx(ޙl


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RE: Agilent 6842A

[Mike Cantwell]

Ken,

That was impeccably said !!!


and I'd like to add:

Agilent is not your Dad's HP.





From: Ken Javor [mailto:ken.ja...@emccompliance.com]
Sent: Wednesday, February 05, 2003 11:35 AM
To: Richard A. Schumacher; mtay...@hach.com
Cc: emcp...@aol.com; emc-p...@majordomo.ieee.org
Subject: Re: Agilent 6842A



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 the
following hurdle to overcome, as a sales person.  Your engineer customer's
point-of-view was that if a piece of non-HP equipment went bad, it was his
fault, for not buying HP.  If a piece of HP equipment went bad, it was HP's
fault.  That is a TREMENDOUS sales advantage, which HP/Agilent casually
tossed aside.

I still buy old HP test equipment when I can find it and when the price is
right.  But my attitude towards new HP equipment is 180 out from what it
was.  The burden of proof is on Agilent to sell me on their quality.  My
initial assumption is that Agilent equipment will be more expensive and not
as good as the competition.

I have an HP case in point.  Over the years (since the early '70s) I have
owned several HP calculators.  HP went to a lot of trouble to make those
early calculators have the look, feel, and quality of good equipment.  In
particular, the buttons had tactile feedback lacking in the competition's
(Texas Instruments).  Those calculators were my intro to HP when I started
my career in the latter '70s.  I learned a lot about my craft in the '70s
and '80s by attending HP sales/technical seminars.  HP was the gold standard
in test equipment.

About a year ago I bought a scientific calculator directly from HP on the
internet for about $70.  Within a month the keyboard had gone bad.  I sent
them a message about it, and never heard back.

I know there was a fight between the heirs of Hewlett and Packard and the
range-of-the-moment bean counter types who eventually took over.   I also
know that Messrs. H&P had to come back from retirement to straighten out the
company once before.

I would tell the heirs to not be disheartened by what has happened.  I
expect they see it as a magnificent monument being defaced.  But a company
is not a monument to the dead.  It is a living entity whose actions reflect
not the will of the dead founders but the present management.

I would say that what has happened to HP is a testament to the
accomplishment of Bill Hewlett and Dave Packard.  Those who followed them
were simply NOT able to fill their shoes.

>From: "Richard A. Schumacher" 
>To: mtay...@hach.com
>Cc: emcp...@aol.com, emc-p...@majordomo.ieee.org
>Subject: RE: Agilent 6842A
>Date: Wed, Feb 5, 2003, 10:05 AM
>

>
> To correct any possible mis-understandings: Agilent was
> spun off from HP and has been a completely separate and
> independent company for some years now.  Carly Fiorina
> has no role in the management or operations of Agilent.
>
> HP does not make, sell or service test equipment.  If
> you have any problem or issue with Agilent products or
> services, call Agilent, not HP.  If your test equipment
> has an "HP" label on it, Agilent (not HP) may be able to
> help you with it.
>
> regards,
> Richard Schumacher
> The above are my own knowledge and opinions.  I am not an
> official speaker for Hewlett Packard.
>
>
>> If you think Carley and the rest of HP / Agilent upper management are
really
>> more concerned about your thoughts - over short term profits,  there are
>> several of us that would like to interest you in some swamp land in
Florida
>> and a bridge in New Jersey.
>>
>
> ---
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EU ascensions - Which countries officially accept the CE mark?

[Mike Cantwell]

All,

There are 8 countries, that I know of, that are currently in the process of
ascension into the EU:

The Czech Republic  (*)
Turkey
Bulgaria
Hungary  (*)
Poland
Romania
Slovakia
Slovenia

Those with (*), I believe, have passed legislation to officially accept the
CE mark for ITE products. Does anyone know if the remaining countries on
this list have either passed legislation to accept the CE mark, or do they
still require their own national marks? 

Any assistance would be appreciated.

Thanks,
Mike Cantwell



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VCCI

[Mike Cantwell]

I notice in all of the VCCI documents, that it only refers to ITE. Any
opinions on whether or not it applies to ISM equipment that is operated
through an industrial PC? This would definitely be a Class A device.

Thanks,
Mike



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RE: Magnetics testing

[Mike Cantwell]

30 to 80 Gauss is equivalent to about 6500 A/m. This is an enormous field!!!

Do you have the right units?



-Original Message-
From: lisa_cef...@mksinst.com [mailto:lisa_cef...@mksinst.com]
Sent: Thursday, June 13, 2002 6:40 AM
To: emc-p...@majordomo.ieee.org
Subject: Magnetics testing



Hello All,

I am wondering if anyone knows of a test lab in the northeast capable of
generating a magnetic field strength of 30 to 80 Gauss?

thanks

Regards,

Lisa

Lisa A. Cefalo, CRE
Manager, Reliability and Design Services
MKS Instruments
(978)-975-2350  X 5669
lisa_cef...@mksinst.com


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RE: Directional Coupler

[Mike Cantwell]

Try:

http://www.werlatone.com/

They can handle it by switching models at 1 GHz. I didn't see one for the
full range.


-Original Message-
From: richwo...@tycoint.com [mailto:richwo...@tycoint.com]
Sent: Monday, May 20, 2002 11:22 AM
To: emc-p...@majordomo.ieee.org
Subject: Directional Coupler



I am seeking sources for a 150W directional coupler for the frequency range
80-2000 MHz. The combination of the power level and frequency range is
eliminating many sources. Any recommendations?

Richard Woods
Sensormatic Electronics
Tyco International


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RE: EMC test report

[Mike Cantwell]

Section 10 of ANSI C63.4 covers what must be in a test report. It's
important to have an accurate description of what was tested, including
photographs. The intent is that the report should be complete enough to
reproduce the test a year from now. Sounds simple... but it's not.

Mike

-Original Message-
From: cecil.gitt...@kodak.com [mailto:cecil.gitt...@kodak.com]
Sent: Thursday, April 25, 2002 6:18 AM
To: emc-p...@majordomo.ieee.org
Subject: EMC test report




Hi All,

Does FCC require that all that information be in the final report.
Such as Product Manufacturer, Table of Contents, Equipment Units Tested,
Equipment and Cable Configuration, List of Test Equipment( calibration
data), Location of Test Site, Measurement Procedures, Reporting Measurement
Data, Summary of Results...
The reason I ask is that it states that "Digital devices ..are to be
measured for compliance using the following procedure..." it doesn't say
that it needs to be in the final summary.


Thanks

Cecil



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RE: FCC Contact

[Mike Cantwell]

You can also search the existing rules interpretation database on the FCC
web site

https://gullfoss2.fcc.gov/prod/oet/index_ie.html

Under miscellaneous, click on rule interpretations.

Mike

-Original Message-
From: Reginald Henry [mailto:rhe...@vicon-cctv.com]
Sent: Wednesday, April 24, 2002 10:14 AM
To: 'rehel...@mmm.com'; emc-p...@majordomo.ieee.org
Subject: RE: FCC Contact



http://www.pseinc.com/faq.htm

Try this site !

RH

-Original Message-
From: rehel...@mmm.com [mailto:rehel...@mmm.com]
Sent: Wednesday, April 24, 2002 9:12 AM
To: emc-p...@majordomo.ieee.org
Subject: FCC Contact



Can anyone provide me with phone and/or name contacts for FCC rules
interpretation (Parts 15, 18, and 68)?

Bob Heller
3M Product Safety, 76-1-01
St. Paul, MN 55107-1208
Tel:  651- 778-6336
Fax:  651-778-6252


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T200/T400

[Mike Cantwell]

All,

Adtran has a T200/T400 shelf platform that several companies apparently make
circuit packs for. 

My contact at Adtran has said that it is an old industry standard pin out
configuration for circuit packs, is similar to the old STD computer bus, and
thinks it was originally developed by Charles Industries or maybe Western
Electric (who became Charles).  

Does anyone have any idea what the original design spec was for this and
where to possibly get copies?

Any information at all would be appreciated.

Mike

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RE: [URGENT] Need some information about NEBS..

[Mike Cantwell]

NEBS compliance is required by the US Regional Bell Operating Companies
(RBOCs). The major aspect of this consist of Telcordia standards (
www.telcordia.com  ):
 
GR-1089-CORE:EMC and safety
GR-63-CORE:Environmental
 
If you have products that must comply with NEBS, you need to purchase these
standards and review them, the requirements are substantial and definitely
have an effect on the design of your product. They also have an impact on
your schedule and budget as the testing can easily take 2 months and cost
$100k (if you pass).
 
Hope this gives you a good start.

-Original Message-
From: Michelle Cho / INT Compliance [mailto:m...@intcompliance.com]
Sent: Thursday, February 14, 2002 1:32 AM
To: emc-p...@majordomo.ieee.org
Subject: [URGENT] Need some information about NEBS..


Dear all,
 
I need some help about something called NEBS(Network Equipment Building
System). The whole procedure...
What exactly the NEBS is and where can I do the testing? How much? How long
does it take?
 
Thanks in advance!
 
Michelle
 
 

FW: Teslars???

[Mike Cantwell]

Nick, Let's not lose sight of the original question: 

"We have a customer that is concerned about how our product, laboratory
equipment, will respond to electromagnetic disturbances from a high speed
train that runs close to their lab.  The customer states that the
disturbance will be around 0.7-1.2 m Teslar."

The B-field and H-field are related by the permeability, in this case, of
free space. This relationship holds for all frequencies, therefore there is
a constant relationship between flux density and field strength.

>From the perspective of designing a product to be immune from magnetic
disturbances, the desired result is to limit the amount of flux passing
through the victim loop and therefore reducing the amount of noise current
in that loop. The effects of this noise current depend on the impedance of
the victim circuit. The actual design solution is dependent on the
characteristics of the victim circuit. 

>From the original question, EN61000-4-3 covers frequencies from 80 MHz to 1
GHz and EN61000-4-6 covers 150 kHz to 80 MHz, while EN61000-4-8 covers power
frequency magnetic fields. In either case, the .7 mT requirement is
substantial and more info from the customer and more info about Joe's
product is required to determine if there is a real potential problem.


-Original Message-
From: Nick Rouse [mailto:nickjro...@cs.com]
Sent: Friday, February 08, 2002 4:08 PM
To: emc; Mike Cantwell
Subject: Re: Teslars???


To be pedantic, you are mixing units of two different quantities there
Mike. Tesla and gauss are units of magnetic flux density, the B field
Ampere/metre and oersted are units of magnetic field strength, the H field.
Only in a vacuum does 1A/m generate a flux density of exactly 0.4 pi µT
In air its pretty close but in ferromagnetic materials it can be thousands
of times bigger. The field strengths mentioned in the original question
are not all that outrageous. Most transformers, motors and generators
with electrical steel laminations operate at peak flux densities of 1.4T to
1.7T
within the core. At a boundary  between two materials of different
permeabilities the tangential component of H and the normal
component of B are the same either side of the boundary.  The amplitude
relative
permeability of electrical steels near their maximum working flux density
is only about 300 to 800. So with the flux flowing along the core at a flux
density
of say 1.5T  and an amplitude relative permeability of 500, you
get a flux density close to the core surface of 3mT. While you are in the
near field
(distances small with respect to the size of the magnetic circuit) this will
not
drop very fast. in the far field it drops according to the inverse cube
dipole
law. Things are even worse at the corners. The flux does not turn smart
right
angles just because the core does and so the flux is not parallel to the
core. This increases the flux density close outside the core. Worse yet are
the
effects of  gaps. Laminations in transformers are commonly made in two parts
that fit together to form  the complete lamination. C & T shape or E and I
shape.
This is done so that the winding can be put on the  bobbin first and then
the core
built up. Where the two parts of the lamination meet up there is always a
small gap
the size of which depends on the quality of the laminations and the care
with which
the core is assembled. Good practice is to alternate the orientation of the
laminations so that the gaps do not align but in some cheap devices the
laminations are stacked up with the gaps aligned.These devices also tend to
be those using poorly cut laminations. Gaps of half a millimetre are not
unknown.they also tend to push the flux density  up closer to the limit
increasing the external flux
even more because of the lower amplitude relative permeability  Gaps in
rotating
machines can be even bigger .
Since the flux crosses the gap almost normally the flux in the gap is the
same as
 in the core 1.4T -1.7T At the edge of the core this flux bulges out into a
fringing
 field. Fortunately this enters the far field dipole law at distances large
compared
 to the gap length and width. Even so fields of tens of mT can be found
within a few
centimetres of the gap. So take a large poorly  built transformer or
solenoid and push
 the core hard up against the equipment housing and you could well exceed
0.7 mT nearby. Several metres from  a train is a bit less likely but not
impossible
These figures should be borne in mind the  next time
you read about the dangers of the magnetic field from overhead power
lines. I have several times seen building site welders sitting on their
transformers
with their testicles dangling over the gap and I haven't seen welders
dropping like
flies.

Nick Rouse



----- Original Message - ,
From: "Mike Cantwell" 
To: "emc-pstc (E-mail)" 
Sent: Friday, February 08, 2002 2:53 PM
Subject: RE: Teslars???


>
>
> I think

RE: Teslars???

[Mike Cantwell]

I think the units you're looking to compare to would be Amps/meter. The
conversion from Tesla to A/m is:

1 A/m = 1.26 uT = 0.0126 Gauss

Therefore, a field of .7 mT converts to 555 A/m !!! (it is also equivalent
to 10 Gauss)

Assuming that your customer is referring to power frequency magnetic fields,
this would be substantial, to say the least.

I would recommend that you question your customer a little further as to how
they determined this field strength requirement. It seems high by a factor
of about 1000.

Good luck,
Mike

-Original Message-
From: marti...@appliedbiosystems.com
[mailto:marti...@appliedbiosystems.com]
Sent: Thursday, February 07, 2002 4:22 PM
To: emc-p...@majordomo.ieee.org
Subject: Teslars???



We have a customer that is concerned about how our product, laboratory
equipment, will respond to electromagnetic disturbances from a high speed
train that runs close to their lab.  The customer states that the
disturbance will be around 0.7-1.2 m Teslar.

Can someone please explain what the unit Teslar is and how that unit
relates, or if it relates, to the immunity tests of EN 61000-4-3 Radiated
immunity, or any other immunity test.

Has anyone ever had a similar concern from a customer dealing with this
type of disturbance?

Your responses are appreciated.

Regards

Joe Martin
EMC/Product Safety Engineer
Applied Biosystems
marti...@appliedbiosystems.com




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Medical Devices in Japan and Australia

[Mike Cantwell]

Does anyone know:

1) Standards for medical devices in Japan and Australia?
2) Approval procedure for medical devices in Japan and Australia?

Any help/direction would be appreciated.

Thanks,

Mike Cantwell


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RE: Question on FCC part 15

[Mike Cantwell]

Good question. Re-phrased: Is a PC always a PC?

According to 15.101(a) provides a table listing the authorization procedures. 
The specific term, and I quote, is "Class B personal computer" and is subject 
to DoC. According to the FCC, 15.3(s) defines a PC as an "electronic computer 
that is marketed for use in the home... considered a Class B digital device". 
This definition is worth reading. It pretty clearly defines a PC.

The definition of a peripheral device is given in 15.3(r) and definitely 
includes the typical PC plug-in type card (ISA, PCI, etc)

15.3(s) also states that if the price or performance is not suitable for home 
use (e.g. includes a $12k measurement card) then it can be considered for other 
authorization procedures.

Returning to the table in 15.101, there is a note that says if the table 
indicates more than one authorization procedure for a device... there is an 
option to select the type of authorization procedure used.

Is a PC always a PC? Is a PC peripheral always a PC peripheral? The answer is 
no. 

I personally reserve the DoC procedure ONLY for personal computers (and typical 
PC peripherals) as defined by 15.3(s) (Class B) and I use the verification 
procedure for those PC type products that are truly intended for the workplace 
(Class A). Of course, the exception is when an industrial PC application meets 
Clas B, then I use the DoC (why limit the market). You cannot, of course, use a 
Class A industrial PC in a "home" environment.

This is a complicated answer to a simple question. Read 15.3(s), and compare 
your application to that definition to decide.

-Original Message-
From: kristiaan.carpent...@alcatel.be
[mailto:kristiaan.carpent...@alcatel.be]
Sent: Tuesday, October 02, 2001 6:09 AM
To: 'IEEE Forum'
Subject: Question on FCC part 15


Hello group,

A data acquisition board for building into a PC has been tested to the European 
standard EN 55022, class B by an accredited testlab in Europe.
This configuration is not meant for a residential market and I suppose FCC part 
15 is applicable.

Which procedure should be followed for part 15, DoC or verification?
Compliance required to Class A or Class B?
If the board can be built in different kind of PC's, how is testing performed?
To determine the max. frequency to test for, do I need the max. internal PC 
frequency or the max. internal freq. of the board?
Will the EN 55022 results be accepted by an FCC lab?, can a European CAB do the 
testing?

Any help is appreciated.
Regards,
Kris Carpentier



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FCC Chairman Powell & NEBS

[Mike Cantwell]

Chairman Powell witnesses, first hand, the devestation in New York.
Interesting...

http://hraunfoss.fcc.gov/edocs_public/attachmatch/DOC-216263A1.pdf



Thanks,

Mike Cantwell, PE, NCE
Flextronics Compliance Laboratories
762 Park Ave.
Youngsville, NC 27596
Tel: (919) 554-0901
Fax: (919) 556-2043
Cell: (919) 815-4067


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GSM IN Taiwan

[Mike Cantwell]

I have two questions and would appreciate any direction:

1) Does anyone know who the Taiwan authority is for GSM phones?

2) Does anyone know of a laboratory that tests GSM phones to their
functional requirements (not EMC and not RF requirements)?


Thanks,

Mike Cantwell, PE, NCE
Flextronics Compliance Laboratories
762 Park Ave.
Youngsville, NC 27596
Tel: (919) 554-0901
Fax: (919) 556-2043
Cell: (919) 815-4067


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RE: Site Correlation

[Mike Cantwell]

I would assume that the 10m semi-anechoic chamber complies with ANSI C63.4
volumetric NSA. I would also assume that the <3m chamber noes not comply.
The major correlation issues would relate to:

1) 3m versus 10m (regardless of the sites)
2) non-compliant room (with peaks and nulls) versus compliant site (meets
NSA)
3) antenna geometry (Bilog, bicon, log-periodic)

There are lots more reasons but I believe these to be the major reasons for
difficulty in correlation.

A comb generator with fixed antenna is more reproducible than signal
generator and antenna as part of the correlation issue is also the personell
performing the test.

Think about the York CNE (Constant Noise Emitter) which puts out junk
continuously up to 2 GHz. With it, you can see any resonances between the
sites (if they exist) and you can develop as good a correlation factor as is
probably possible.

Good Luck.

-Original Message-
From: Tudor, Allen [mailto:allen_tu...@adc.com]
Sent: Thursday, January 11, 2001 8:58 AM
To: EMC-PCST (E-mail)
Subject: Site Correlation



Greetings:

What's the best way to correlate a pre-compliance chamber (smaller than a 3m
chamber) to a 10m anechoic chamber?  Should I use a signal generator and
antenna or should I use a comb generator?

Would the answer be different if I were correlating the pre-compliance
chamber to an OATS?

Thanks in advance.


Allen Tudor, Compliance Engineer
ADC DSL Systems Inc.
6531 Meridien Dr. 
Raleigh, NC  27616
phone: 919.875.3382
email: allen_tu...@adc.com


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EN 60439-1 ???

[Mike Cantwell]

All,

EN 60439-1 is titled "Low-voltage switchgear and control gear asemblies -
Part 1: Type-tested and partially type-tested assemblies" and is listed as a
harmonized standard under the EMC Directive. 

Does any one know the scope of this standard ???

If you know the scope, does it apply to diesel - generator sets (or maybe
some of it's controls) ??

As always, trying to determine what it is prior to buying it. Any help is
appreciated.

Thanks,

Michael Cantwell, PE, NCE

 <<...OLE_Obj...>> 
EMC Laboratories
762 Park Avenue
Youngsville, NC 27596
Tel: (919) 554-0901
Fax: (919) 556-2043
Cell: (919) 815-4067


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NSA above 1 GHz

[Mike Cantwell]

Does anyone know of any Normalized Site Attenuation measurements above 1
GHz? I'm specifically interested in whether or not ANSI C63.4 or CISPR-22 is
planning this, and if so, is there any preliminary info?

Any help would be greatly appreciated.


Thanks,

Mike Cantwell

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RE: Beta Units and the FCC

[Mike Cantwell]

2.806    I need to throw my blue copy of the FCC rules away. 


Thanks,

Michael Cantwell, PE, NCE
Flextronics International
EMC Laboratories
762 Park Avenue
Youngsville, NC 27596
Tel: (919) 554-0901
Fax: (919) 556-2043


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RE: Beta units and the FCC

[Mike Cantwell]

47 CFR  2.806(c)(3), (4), and (5) addresses this issue.

(3) "Any digital device may be operated at the manufacturer's facilities
during development, design or preproduction states for evalutaion or product
performance and determination of customer acceptability."

(4) extends (3) to include user's site.

(5) clarifies (4) and (5) a little more.

The not for sale or lease stickers and informing the user that the unit does
not comply with the FCC rules as stated in 2.803 or 2.805 also keeps you out
of trouble.

>  -Original Message-
> From: Mike Morrow [mailto:mi...@ucentric.com] 
> Sent: Wednesday, October 25, 2000 12:22 PM
> To:   EMC Society
> Subject:  Beta units and the FCC
> 
> What are the rules regarding a piece of equipment that is being beta
> tested (not for sale, not being offered for sale) that does not currently
> comply with Part 15B limits?  Everything I've read (47CFR Part 2.803)
> revolves around marketing and sales of the equipment, but nothing about
> equipment that is being given to someone for evaluation. FYI, the unit
> only has two failing frequencies and it only fails by about 4 db.  I am
> planning on putting a "not for sale" sticker on the units as well.  Thanks
> in advance.
> 
> Mike Morrow
> Senior Compliance Engineer
> Ucentric Systems
> 978-897-6482
> mi...@ucentric.com
> www.ucentric.com 
> 

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CE Mark GIF File

[Mike Cantwell]

I have attached a GIF file containing the CE Mark. I hope this is useful for
those looking for it.

 <> 


Thanks,

Michael Cantwell, PE, NCE
Flextronics International
EMC Laboratories
762 Park Avenue
Youngsville, NC 27596
Tel: (919) 554-0901
Fax: (919) 556-2043

<>

RE: Wiring under raised floors

[Mike Cantwell]

Section 645-5 of the United States National Electrical Code states that the
branch-circuit conductors must be in conduit. If these branch circuits feed
a receptacle, it is acceptable for the receptacle to be located under the
floor so long as the receptacle is accessible (i.e. a floor panel can be
easily removed) and that the power cord is type DP (other type designations
are listed in the code as well, I leave it to others to describe the
differences). 

I have seen computer rooms in the US with receptacles located below the
raised floor and not heard of any issues. I think the bigger issue is that
of having power and signal cables in the same proximity causing EMI type
problems.

-Original Message-
From: ted.eck...@apcc.com [mailto:ted.eck...@apcc.com]
Sent: Wednesday, September 20, 2000 9:12 AM
To: emc-p...@ieee.org
Subject: Wiring under raised floors



Is it permissible to place electrical receptacles under the raised floor of
a computer room?  Can power cords pass through openings in the raised floor
or do all power connections need to be in conduit?  I have received two
opinions; one stating that receptacles must be accessible above floor level
and the other stating that receptacles can be placed below the floor.

The United States National Electrical Code is a bit vague on the subject,
although Article 645-5 (d) (2) seems to imply that conduit is only required
up to the receptacle.  I can find no references to raised floor
installations in the Canadian Electrical Code or BS 7671, IEE Wiring
Regulations.

Ted Eckert
Regulatory Compliance Engineer
American Power Conversion Corporation
ted.eck...@apcc.com

The items contained in this e-mail reflect the personal opinions of the
writer and are only provided for the assistance of the reader.  The writer
is not speaking in an official capacity for APC nor representing APC's
official position on any matter.


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RE: NSA (using acid)

[Mike Cantwell, PE]

Muriatic acid is made up of 50% HCl (hydrochloric acid) and 
50% water. Diluting it with water is fine.


Thanks,

Mike Cantwell, PE
RheinTexas, Inc.
Suite 150
1701 East Plano Parkway
Plano, TX 75074
mailto:mcantw...@rheintexas.com
Web Site: http://www.RheinTech.com
Tel: (972) 509-2566
Fax: (972) 509-0073

-Original Message-
From:   Brian At Work [SMTP:bkundew...@qtm.net]
Sent:   Thursday, July 29, 1999 3:20 PM
To: EMC and Safety list
Subject:Re: NSA (using acid)


A quick question.

Between the muriatic acid and the acid flux that is used to 
clean the screen
material, will water dilute the acid good enough to stop 
its reaction or
should you use something like soda to counteract it? One 
responder said not
to use water but to just blow it off with compressed air. 
Won't the acid
continue to eat away at the material?

Thanks,
Brian


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RE: EMC Test Labs - Austin

[Mike Cantwell, PE]

RheinTexas is an EMC test lab in Plano (just outside of 
Dallas) and is NVLAP accredited. We are located just a few 
blocks north of the Telecom corridor in Richardson. They 
can be reached at (972) 509-2566.

Thanks,

Mike Cantwell, PE


-Original Message-
From:   POWELL, DOUG [SMTP:doug.pow...@aei.com]
Sent:   Thursday, July 15, 1999 4:27 PM
To: 'emc-pstc'
Subject:EMC Test Labs - Austin


Hello group,

I am looking for an EMC test lab in the Austin Texas area. 
 I need an
accredited lab that can test to EN 50081-1 and EN 50082-1.

I am especially interested in responses from people's 
responses who have
positive experience's as a customer.  After I can look in 
the phone book
too.

-doug

==
Doug Powell; Regulatory Compliance Engr.
Advanced Energy Industries, Inc.
doug.pow...@aei.com
==

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French Guinea

[Mike Cantwell, PE]

Does anyone know what the EMC and safety requirements are 
for French Guinea?

Thanks,

Mike Cantwell, PE
RheinTexas, Inc.
Suite 150
1701 East Plano Parkway
Plano, TX 75074
mailto:cantw...@flash.net
Web Site: http://www.RheinTech.com
Tel: (972) 509-2566
Fax: (972) 509-0073


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RE: NARTE Certifcation

[Mike Cantwell, PE]

NARTE can be reached at (508) 533-8333. For anyone interested in this
certification, they will send an informative package detailing the
requirements for certification and a list of study guides. For those of us
who weren't smart enough to grandfather when that opportunity was given, the
exam is the only way to become certified. The required experience for an
engineer is 9 years and a technician is 5 years. Each year of college will
count as a year of experience. 

There are no preparation courses for the NARTE exam that I'm aware of but,
the study guide is useful to find out what type of material wil be on the exam.

The study guide is entitled "Study Guide for Electromagnetic Compatibility
Engineers" and is available through:
The SCEEE Press
Northeast Consortium for Engineering Education (NCEE)
1101 Massachusetts Avenue
St. Cloud, FL 34769

The NARTE information package also lists other books which are useful to
bring to the exam.

   +--+
   | Mike Cantwell, PE|
   | Director of EngineeringRheinTexas, Inc.  |
   | NARTE Certified EMC Engineer   Suite 150 |
   | Tel: (972) 509-25661701 East Plano Pkwy  |
   | Fax: (972) 509-0073Plano, TX 75074   |
   +--+

US-TX-Job: EMC Technicians

[Mike Cantwell, PE]

We have IMMEDIATE opportunities for EMC technicians. RheinTexas is a brand
new EMC Test Lab with great opportunities in a very upbeat environment.

Duties:
radiated/conducted emissions
immunity testing
customer interfacing
technical report preparation

Skills required:
Good verbal and written communications
PC Literate (Microsoft Office)
knowledge of electronics
will consider experience > 1 year
ability/willingness to learn

Skills preferred:
EMC test experience in emissions and/or immunity
Experience with Spectrum Analyzers and/or Receivers
General electro-mechanical troubleshooting skills
Knowledge of FCC, CE, VCCI, CISPR, etc.


Pleas send resumes to:

   +--+
   | Mike Cantwell, PE|
   | Director of EngineeringRheinTexas, Inc.  |
   | NARTE Certified EMC Engineer   Suite 150 |
   | Tel: (972) 509-25661701 East Plano Pkwy  |
   | Fax: (972) 509-0073Plano, TX 75074   |
   +--+

RE: How long for continuous?

[Mike Cantwell]

When the heart goes into ventricular fibrillation, you're right, it is very
erratic and does not pump blood very efficiently. The purpose of the
defibrillator is to attempt to get the "electrical system" of the heart back
into a normal sinus rythm. It may very well stop the heart first, the next
time I see my Doctor, I'll have to ask him. I think it may work either way.
Sometimes the heart does go into asystole (flat line) and drugs are given to
stimulate the heart muscle along with CPR. I've also seen the rythm improve
to life sustaining but critical condition. I'm not an EMT any more, but it
was rather gratifying to have a "save". Oh well, off the original topic, but
this is my justification for my two cents worth.

Mike Cantwell, PE



At 08:15 AM 11/26/96 EST, you wrote:
>A PS to your note on defibrillators. I believe that a defibrillator STOPS the 
>heart, not starts it. When the heart goes into fibrillation, it has an erratic 
>and quite rapid pulse, it is fibrillating rather than pumping in rythm, and no 
>blood gets pumped. The heart fibrillation then needs to be stopped which is 
>where the defribrillator comes in. It puts out the current through the heart , 
>stops it dead, and then hopefully the heart will start up again either on its 
>own or with manipulation.
>
>Regards, 
>
>Gabriel Roy
>Hughes Network Systems
>MD
>
>

   ***+**
   *Mike Cantwell, PE !  Compliance Engineer*
   *  P.O. Box  740   !  Bio-Rad Laboratories   *
   *  21 Park Street  !   237 Putnam Avenue *
   *   Pepperell, MA 01463! Cambridge, MA 02139 *
   *   Tel: (508) 433-6907!  Tel: (617) 234-7248*
   *   Fax: (508) 433-0699!  Fax: (617) 234-7199*
   **

RE: How long for continuous?

[Mike Cantwell]

>Date: 14 Nov 96 18:58:35 EST
>From: "Egon H. Varju" <73132.2...@compuserve.com>

>
>
>
>Every reasonable instance, that I can imagine, of injury or damage resulting
>from an energy hazard, will happen very fast and be over and done with in less
>than one second (human reaction time) or even faster (20 J @ 240 VA = 83 ms).
>So what possible significance can there be in relating this to a test that runs
>for one minute or even longer?
>

A little perspective:

 A defibrilator usually puts out 200 joules with the first shock and it
goes up from there, depending on what the Doctor or Paramedic thinks is
necessary. The standard says that 20 joules is a hazard, and this is 10% of
the value used to start your heart if it stops. 

Is 20 joules enough to STOP your heart? I have no idea, but you will
definitely feel it.

If 240 VA for 83 msec puts out 20 joules, then 240 VA for 830 msec puts out
200 joules. This amount of energy CAN start your heart, there should be no
doubt that it can also stop it.



At the end of one minute, I would call you toast.


Mike Cantwell, PE