EMC chamber breakout panel connectors - pref in UK

[emc-p...@ieee.org]

Can anyone recommend suitable panel mount connectors for an EMC chamber
breakout panel to allow the following shielded signal cables to “pass
through” the chamber wall:

 

· RJ45 

· USB “A”

· VGA 

 

Regards

Charlie

 

Charlie Blackham

Sulis Consultants Ltd

Tel: +44 (0)7946 624317

Web: www.sulisconsultants.com  

Registered in England and Wales, number 05466247

 

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Re: Standard test finger

[emc-p...@ieee.org]

In message 
, 
dated Thu, 25 Nov 2010, iun...@servomex.com writes:

>Can any member please tell me where in the UK I can purchase a rigid 
>and a jointed IEC 61032 test finger, as shown in IEC 61010-1, Annex B?

Did you try:

  http://www.ridgewayprecision.co.uk/index.html

The list of standards they claim to cover is a bit pathetic, but they do 
make test fingers and if you send the drawings I expect they will tell 
you if they already make them or can make them for you.

However, I've never dealt with them: I made my own.
-- 
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
If at first you don't succeed, delegate.
But I support unbloated email http://www.asciiribbon.org/

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Re: [PSES] Shield bonding on STP Cat5 Ethernet cables

[emc-p...@ieee.org]

A magnetic field will couple through the shield even if grounded at both
ends, albeit in attenuated form.  It's really just a matter of how much
attenuation can be achieved.  I've been working on an instrument with a
pulsed magnetic field powerful enough to cause robust electrostimulation
of any flesh in the near vicinity.  An interposed sheet of ordinary
kitchen grade aluminum foil reduces but does not eliminate the shock
sensation.  This is at 5 KHz.  Turning to the matter of audio cables, hum
levels even 60 to 80 dB below the program content will prove annoying,
and the standard braided shield or even braid over foil can reduce the
hum, but at power frequencies the answer is never as much as one would
wish for.  Absent resort to mu-metal shielding, the key to audio hum
rejection is, as always, balance rather than shielding per se.

The physics is straightforward enough.  In magnetically transparent
metals such as aluminum or copper, magnetic shielding is achieved by eddy
current effect rather than flux shunting.  Most shields are rather too
thin to be efficient at this for power frequencies.  For instance, the
skin depth for pure copper at 60 Hz is around 8.5mm.  It takes 4 skin
depths to reduce ambient magnetic fields by 70 dB, easy at RF but rather
impractical for hum reduction in an audio cable routed past a power
transformer, or control wiring routed near 'cabling carrying large
currents'.  

I completely agree that UTP is satisfactory for ethernet even in noisy
industrial environments.  It's not just that the system is well balanced,
but also that the signals are transformer coupled and galvanically
isolated from the equipment with insulation good past a kilovolt.  Adding
a shield is just a means to violate galvanic isolation.  At RF a properly
grounded shield can help suppress CM radiation, but if that is a problem
then the balance assumption has been blown and ferrites are probably a
better solution.  Why are  shielded CAT-5 cables available?  Because
people are willing to buy them, and to keep EMC consultants busy when it
doesn't help.

Orin Laney


On Wed, 24 Nov 2010 21:34:10 + John Woodgate 
writes:
> In message 
> , 
> dated Wed, 24 Nov 2010, "ce-test, qualified testing bv - Gert 
> Gremmen" 
>  writes:
> 
> >Magnetic fields from will couple 
> >through the shield.
> 
> Well, not if it's grounded at all frequencies at both ends, but then 
> you 
> get all the circulating currents problems.
> 
> We all seem to agree - use UTP unless you find you can't, but using 
> STP 
> may be difficult anyway.
> -- 
> OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and 
> www.isce.org.uk
> John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
> If at first you don't succeed, delegate.
> But I support unbloated email http://www.asciiribbon.org/
> 
> -
> 
> This message is from the IEEE Product Safety Engineering Society 
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> 
 

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Standard test finger

[emc-p...@ieee.org]

Dear Group, 

Can any member please tell me where in the UK I can purchase a rigid and a
jointed IEC 61032 test finger, as shown in IEC 61010-1, Annex B? 

Many thanks in anticipation of you help. 

Ian Unwin 

 Servomex company information and outgoing e-mail advice. 
Servomex Group Limited, Jarvis Brook, Crowborough, East Sussex, TN6 3FB,
England.
e-mail: i...@servomex.com 
Company Registered in England: No.2170458 
VAT No.: GB 522 6077 63 

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答复: [PSES] 2.4GHz band radio control requirements (EU)

[emc-p...@ieee.org]

Hi Nick,

It depends on what's destination of your product.
For EU, it's required to do RF testing according to RTTE directive,
As it's FHSS modulation, the test standard would be EN 300 328, 301 489.
for US, you would do FCC ID, testing standard is FCC part 15c.
For Canada, it's required to do IC ID, standard is tad-210.
Almost, all regions in world required RF approval.


Regards
Tim

发件人: Nick Williams [nick.willi...@conformance.co.uk]
发送时间: 2010年11月25日 3:20
收件人: EMC-PSTC@LISTSERV.IEEE.ORG
主题: [PSES] 2.4GHz band radio control requirements (EU)

I'm looking for some advice and insight to help me identify and apply
the relevant standards for radio remote controls for model cars
operating in the 2.4GHz band using FHSS. I may also need to identify
people who have the capability to perform compliance testing.

First off, can anyone point me to a resource which gives a brief
primer on the 'state of the art' as regards the choice and
application of standards to these devices?

Thanks!

Nick.

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2.4GHz band radio control requirements (EU)

[emc-p...@ieee.org]

I'm looking for some advice and insight to help me identify and apply 
the relevant standards for radio remote controls for model cars 
operating in the 2.4GHz band using FHSS. I may also need to identify 
people who have the capability to perform compliance testing.

First off, can anyone point me to a resource which gives a brief 
primer on the 'state of the art' as regards the choice and 
application of standards to these devices?

Thanks!

Nick.

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Re: Re: [PSES] Machinery to China

[emc-p...@ieee.org]

The only mandatory safety requirements for the product to be placed to the
China Market is CCC certification requirement which is currently applicable
for household appliances only. If the product is designed purely for the use
of industrial environment, the CCC requirement will not be applicable.
 
 
Eunice Yang 
 
CEM International Ltd 
The Atrium Business Centre 
Curtis Road
Dorking
Surrey RH4 1XA
 
Tel:  +44 (0)1306 646388
Fax: +44 (0)1306 646389
Email: eunicey...@cem-international.co.uk
 
Website: www.cem-international.co.uk  
 
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Recipient") to whom it is addressed. It may contain information, which is
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contact the sender as soon as possible.
 
CEM International Ltd is a company Limited by Shares. Registered in England
No: 4513974.  
Registered Office: The Atrium Business Centre, Curtis Road, Dorking, Surrey
RH4 1XA


It all depends on the type of machinery and the intended application. Please
share some more information with us. 
Happy Thanksgiving
Peter Merguerian
Go Global Compliance Inc.
pe...@goglobalcompliance.com
(408) 416-3772
H
Sent from my iPhone
On Nov 24, 2010, at 10:29 AM, "Pete Perkins"  wrote:
> A company is planning to expand manufacturing into China and will supply
> their own custom designed equipment for their facility.  
> 
> What safety and regulatory requirements apply to this equipment being
> imported into China? 
> 
> :>)br,Pete
> 
>Peter E Perkins, PE
>Principal Product Safety & Regulatory Consultant
>Tigard, ORe  97281-3427
> 
>503/452-1201fone/fax
>p.perk...@ieee.org
> 
> -
> 
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