RE: Anechoic chambers: risks of energy leaking out
Hi again, Covering comments since I last posted - yes chokes may provide sufficient attenuation for the purpose - but to confirm this all the possible issues need to be considered. With a waveguide beyond cut off, filling the hole with a dielectric effectively increases the frequency that it will pass. 3mm at 40GHz gave 100dB. Fitted with PVC coated fibre the attenuation dropped to 60dB - we ended up with 1.5mm fibre through the waveguide. In the EU - the EMC Directive now explicitly places requirements on Fixed Installations. Now I know I will get some disagreement, but in my opinion, we all work in fixed installations therefore an EMC facility is either a fixed installation in its own right OR it is part of a bigger fixed installation. The radiated immunity signal is - by definition - a transmission. If this is done in a screened room, then the radiation is suppressed radiation. Strangely, there is a UK Statutory Instrument regarding Suppressed Radiation which dictates the limits of radiation detectable outside the suppression. If these limits are met, and operation is contained within the frequency range, then no license is required. It would therefore seem that, if the limits are exceeded or the frequencies in use extend beyond the frequency range in the regulations - then a licence IS required. The table for the UK is given below. I have no idea what other Member States require in the way of limits and frequency ranges -or indeed whether they have any regulations of the nature of the UK regulations. However, returning to the EMC Directive, there is a requirement for the fixed installation to meet the protection requirements of the Directive AND for record to be kept. My Company - the Company I work for - lies underneath the flight path for London Luton airport. ALL engineering (not just the EMC) is carried out inside screened rooms - about 3,000 sq.m. of them. The EMC Support equipment, the high power amplifiers and the project support equipment is all contained within their own screened rooms - that is the emc facility is a suit of four screened rooms. The screening is maintained so that is does not fall below a level that maintains the emissions at levels lower than those given in the table. You will smile when you look up SELEX Galileo - Sensors and Airborne Systems - as you will see why we go to so much trouble to stop signal leaking out. An alternative view, would be to treat the fixed installation (the EMC Facility) and apply the limits of a well known EN for radiated emissions - at 10m from the screened room. If you have 10V/m in the screened room at 3m from the antenna, that is 140dBuV/m at 3m, then it is easy to calculate the level at, say, 16 or 20m from the antenna. The minimum screening that this approach would give would be, say 140 - 20log(20m/3m)-37dBuV (for frequencies above 230MHz) = 140 - 16.5 -37 = 86.5dB. Below 230MHz, on the same basis, 93.5dB attenuation would be required. If this can be obtained via through connections, filters, the grade of screening on the coax, etc. then there should be no problems being under the flight path of an airport. Food for thought. Regards Tim Statutory Instrument 1989 No. 1842 SCHEDULE Regulation 5 TERMS, PROVISIONS AND LIMITATIONS OF EXEMPTION 1.Use of relevant stations and relevant apparatus for emission shall be limited to use - (a) on a frequency within a frequency band specified in table 1 below; and (b) where the maximum field strength of the emission does not exceed the limit specified in relation to that frequency band when measured at the distance specified in relation thereto. TABLE 1 Frequency Band (MHz) Limit for maximum field strength (dB.013 V/m) Distance at which measurement taken (m) 0.150 - 0.2835 34 100 0.5265 - 1.605 34 100 1.605 - 2.1735 48 100 2.1905 - 3.950 48 100 22.00 - 29.999 34 100 30.00 - 70.5030 30 71.50 - 74.6030 30 75.40 - 80.0030 30 84.00 - 108.00 30 30 137.00 - 143.00 30 30 144.00 - 146.00 30 30 148.00 - 153.00 30 30 156.8375 - 225.0030 30 400.00 - 405.50 30 30 406.50 - 450.00 30 30 453.00 - 464.00 30 30 467.00 - 960.00 30 30 2.Relevant stations and relevant apparatus shall not radiate, in any frequency band, spurious emissions of a maximum field strength in excess of the limit, when measured at the distance specified in table 2 below in relation to each frequency band - TABLE 2 Frequency Band (MHz) Limit for maximum field strength (dBV/m) Distance at which measurement taken (m) below 30 23 100
RE: Anechoic chambers: risks of energy leaking out -ERRATA
Sorry - errata where I said filling the hole with a dielectric effectively increases the frequency that it will pass that should read filling the hole with a dielectric effectively decreases the frequency that it will pass regards Tim Tim Haynes A1N10 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG ( Tel : +44 (0)1582 886239 7 Fax : +44 (0)1582 795863 ) Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com P Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - 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 postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher j.bac...@ieee.org David Heald dhe...@gmail.com
RE: Anechoic chambers: risks of energy leaking out
John, All, The table at the bottom of my early e-mail IS from the Statutory Instrument - It is THE SCHEDULE referred to in the SI and is published (in the paper format) along with the SI. If you are looking at a web version, you should find a link to the schedule. John, I will send the HTML pages that I downloaded from Ofcom under a plain cover J Regards Tim Tim Haynes A1N10 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG ( Tel : +44 (0)1582 886239 7 Fax : +44 (0)1582 795863 ) Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com P Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of John Woodgate Sent: Thursday, January 15, 2009 9:21 AM To: emc-p...@ieee.org Subject: Re: Anechoic chambers: risks of energy leaking out *** WARNING *** This mail has originated outside your organization, either from an external partner or the Global Internet. Keep this in mind if you answer this message. In message 201048ea81ba0745aca78e4cc883900104290...@desmdswms201.des.grplnk.net, dated Thu, 15 Jan 2009, Haynes, Tim (SELEX GALILEO, UK) tim.hay...@selexgalileo.com writes: Strangely, there is a UK Statutory Instrument regarding Suppressed Radiation which dictates the limits of radiation detectable outside the suppression. But it isn't, it seems, Statutory Instrument 1989 No. 1842, which is about *exemptions* from Article 1 of the Wireless Telegraphy Act, and doesn't include the table of frequencies, distances and levels. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Things can always get better. But that's not the only option. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - 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 postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - 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 postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
RE: Anechoic chambers: risks of energy leaking out
Further to my last e-mail, http://www.opsi.gov.uk/si/si1989/Uksi_19891842_en_1.htm Is the Statutory Instrument, at the bottom of which is a link with the word continue that links to the table at http://www.opsi.gov.uk/si/si1989/Uksi_19891842_en_2.htm Regards Tim SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - 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 postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
RE: First EUP Regulation implementation regarding standby power
I saw written... Considering the fact that if device is used in heated location than reducing its power (active and stand-by) saves no energy I came to: Let's start from reducing outdoor devices stand-by mode ? ;-) Piotr Galka On that basis, we should also consider reducing the power (active and standby) of equipment used in any premises that are cooled by air-conditioning! But the point is made. Tim SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - 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 postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
RE: Anechoic Chamber: Pass-through vs. Bulkhead
Hi All, Conventional wisdom is, as stated, to bond the shield of a cable, hydraulic pipe, or any other electrically conductive - non-energised item that penetrates the shield wall. This is usually done with a purpose made bulkhead connector and is, again, usually done at a purpose made access plate in the shield room wall. Energised items cannot be connected to the shield and here the conventional wisdom is to connect the energised conductor via a filter that has its local ground connected to the shield wall. However, it might be acceptable to use a pass-through pipe where the pipe is long and can provide a sufficiently high capacitance to ground to form a functional filter at the frequencies of concern. The capacitance might be increased by stuffing the pass through pipe with conductive wire wool. I once had no option but to pass through a cable into the chamber. The project allowed me to remove the outer insulation at the pass through and I bonded the cable shield to the screened room by using a bolt to apply pressure to a shim of metal that held the cable firmly to the metal of the pass through pipe. That worked well. I hope the information helps. Regards Tim Tim Haynes A1N10 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG ( Tel : +44 (0)1582 886239 7 Fax : +44 (0)1582 795863 ) Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com P Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - 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 postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher j.bac...@ieee.org David Heald dhe...@gmail.com
RE: FCC Part 15.109 and 15.209 Radiated emission limits
Hi Andy, In the UK it is the same. Developers of radio equipment are required to suppress the harmonic and spurious radiated emission levels to a level lower than the general radiate emission limits given for domestic environments [for most of the spectrum, this is true - there are some exceptions] The only reason I have ever been given, is that radio designers have (or should have) the knowledge and test equipment to achieve these levels AND because the equipment is likely to be connected to an antenna mounted at a reasonable height above ground. The general requirement is applied to non-radio equipment, where the designer might not have the knowledge or the equipment to achieve the lower levels. Since the equipment is likely to be used at a normal height, not normally connected to an antenna and normally used inside a building [a lot of generalisation on my part here] the permitted levels will actually have a lower risk of causing interference to radio systems. I do not know if the same logic has been applied in America but it might have been. Regards Tim Tim Haynes A1N10 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG ( Tel : +44 (0)1582 886239 7 Fax : +44 (0)1582 795863 ) Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com P Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Andrew McCallum Sent: Wednesday, January 07, 2009 10:44 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: FCC Part 15.109 and 15.209 Radiated emission limits *** WARNING *** This mail has originated outside your organization, either from an external partner or the Global Internet. Keep this in mind if you answer this message. Happy new year all Can anyone explain why an unintentional radiator is allowed to have higher emission limits than an intentional radiator. By design you would hope that spurious emissions from an intentional radiator would be lower but why have two different limits? Any help much appreciated. regards Andy Confidentiality: This e-mail and its attachments are intended for the addressees only (or people authorised to receive them on their behalf) and may be confidential or privileged. If they have come to you in error you must take no action based on them, nor must you copy or show them to anyone; please delete them from your system and reply to this e mail highlighting the error. Security: Please note that this e-mail has been created in the knowledge that internet e-mail is not 100% secure. Anyone who communicates with us by e-mail is taken to accept this. Viruses: We have taken steps to ensure that this e-mail and attachments are virus free, but we advise that in keeping with good computing practice you should ensure that they are actually virus free. DeltaRail Group Limited registered office Hudson House, 2 Hudson Way, Pride Park, Derby, DE24 8HS. Registered in England and Wales, number 5839985. Please refer to www.deltarail.com - 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 postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher j.bac...@ieee.org David Heald dhe...@gmail.com SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - 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 postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can
RE: Pacemakers
John, Is WG15 also dealing with combined pacemaker/defibrillator units? I have a friend who emigrated to Greece from the UK because the anti-theft devices at UK shop entrances use to trip the defibrillator into action. A couple of joules across the heart is apparently equivalent to a couple of hundred joules across the chest - not nice! Regards Tim Tim Haynes A1N10 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG Tel : +44 (0)1582 886239 Fax : +44 (0)1582 795863 Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman From: emc-p...@ieee.org [mailto:emc-p...@ieee.org mailto:emc-p...@ieee.org ] On Behalf Of John Woodgate Sent: Wednesday, January 07, 2009 3:07 PM To: Helge Knudsen Cc: emc-p...@ieee.org Subject: Re: Pacemakers *** WARNING *** This mail has originated outside your organization, either from an external partner or the Global Internet. Keep this in mind if you answer this message. In message 2f29d35299a4dc4bae37325d0a8be6148df...@nfexc1.daniro.dk, dated Wed, 7 Jan 2009, Helge Knudsen h.knud...@niros.com writes: I do not think Cenelec TC 106X work with this issue: I do: their WG15 is studying the subject. Scope (en) TC 106X deals with various aspects of the exposure of people to electromagnetic fields from 0 Hz to 300 GHz. Yes, and that includes exposure of the pacemakers to those fields. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Things can always get better. But that's not the only option. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - 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 postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - 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 postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher j.bac...@ieee.org David Heald dhe...@gmail.com
RE: Mobile Phones in EMC Labs
Luke, Yes, because: The phone radiation might interfere during emission tests by entering the chamber via a penetration interfering with external support equipment create spurious emissions by creating secondary mixing products immunity tests by being amplified (in the amplifier) along with the wanted immunity signal causing failures in the support equipment that are laid against the item under test No, because business is more reliant than ever on mobile communications and a ban will cut your customers off from their business if your emc test lab is bothered by any of the items under yes your customers might suspect your EMC skills are not up to the mark you might not want your personal calls going through the company switchboard Otherwise - it is your call... Regards Tim Tim Haynes A1N10 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG ( Tel : +44 (0)1582 886239 7 Fax : +44 (0)1582 795863 ) Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com P Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Luke Turnbull Sent: Tuesday, December 09, 2008 9:22 AM To: emc-p...@ieee.org Subject: Mobile Phones in EMC Labs *** WARNING *** This mail has originated outside your organization, either from an external partner or the Global Internet. Keep this in mind if you answer this message. Hi all, Should we ban the use of mobile phones in our test lab (i.e. outside our test chambers, but in the same EM environment as the sig gens, spectrum analysers, receivers etc.)? Opinions with reasons would be greatly appreciated. Thanks, Luke Turnbull Conekt is a trading division of TRW Limited Registered in England, No. 872948 Registered Office Address: Stratford Road, Solihull B90 4AX - 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 postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher j.bac...@ieee.org David Heald dhe...@gmail.com SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - 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 postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher j.bac...@ieee.org David Heald dhe...@gmail.com
RE: Cables On The Floor
Ed, I can extend the theory of unexplained attraction to other areas. when the screened room door has a brass surround with finger stock mounted within, then a) people will stand on the door frame even when you tell them not to. b) people need to poke at the finger stock to check how springy it is! When entering the screened room during an emission test using an active 1m vertical rod - they need to touch the rod and blow up the Hi-Z amplifier. When using that receiver with the 1.5mm square holes across the whole surface - an engineer will take out the terminal screwdriver and drop the blade through the holes - even though he has no idea what voltages the blade might encounter! and the list goes on... Regards Tim Tim Haynes A1N10 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG ( Tel : +44 (0)1582 886239 7 Fax : +44 (0)1582 795863 ) Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com P Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Price, Edward Sent: Wednesday, December 10, 2008 1:45 AM To: emc-p...@ieee.org Subject: Cables On The Floor *** WARNING *** This mail has originated outside your organization, either from an external partner or the Global Internet. Keep this in mind if you answer this message. From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Gert Gremmen Sent: Tuesday, December 09, 2008 12:23 PM To: Pettit, Ghery; Luke Turnbull; emc-p...@ieee.org Subject: RE: Mobile Phones in EMC Labs Of course once your gold-plated coaxial connectors wear out, and your cables became flat from standing on it, you will see all kind of spurious outdoor signals in your result. Gert Gremmen Although I am naturally pessimistic, I am not superstitious. However, how else to explain the near magical capabilities of a cable laying on the floor to attract human feet? If I lay a BNC or SMA cable (assuming 1/4 cross section by 10 foot exposure length) onto the working area (about 16' by 12'), the cable occupies only 30/27,468, or only about 0.11% of the floor area. The typical human feet cover 4 by 12 by 2, or 96 square inches. So there are 27,468/48, or 286, places where you can step in the room. You would think that the odds of stepping on the cable would be 285 to 1. But from experience, as you talk with a visitor in the chamber, how many times have you looked down to see one of their feet planted squarely across a cable? Indeed, it's not all that remarkable for a visitor to managed coverage with both feet. Or to amble along the cable as if it were some kind of guidance wire! Some programs attract a disproportionate amount of official (management) visitors, and it was during one of those that I implemented my experiment with sacrificial cables. After walking each visitor into my chamber, while repeating the mantra of please be careful not to step on a cable and pointing at a cable so that they understand what a cable looks like, I began to notice the mathematical anomaly of non-random foot placement. I decided to test my suspicions, so, as we moved into conducted susceptibility testing, I laid four BNC cables around the chamber working area. (These were cables accumulated during the radiated emission test; cables which had endured numerous verified foot stomps.) Then I began watching the visitor pattern. I wish I had kept accurate data, for I'm sure that I could have produced a very important and controversial paper (that could have given me a decent vacation for its presentation). However, I am left with only the subjective memory of those trials. I concluded that cables have some kind of unexplained power to strongly direct the human mind to place a foot over a cable whenever the physical opportunity is available. Although I never conducted further trials, I have speculated as to the attractive mechanism that causes this. I wonder if it may somehow be related to the technique by which cows are kept off of a roadway (cows will not cross a couple of parallel painted stripes on the ground). True, this would be an inverse relationship, as cables attract the foot, but I think I'm really onto something important here. BTW, the test cables were all later found to be in acceptable condition, and were returned to service. I must assume that either I am being too alarmist about the dangers of stepping on a cable, or, my management just leaves no lasting impression on physical reality. More studies are needed! Ed Price ed.pr...@cubic.com blocked::mailto:ed.pr...@cubic.com WB6WSN NARTE Certified
RE: EMI Receivers
Hi All, I had some equipment calibrated by a.n.other accredited calibration house - chosen by the management because it was cheaper. Things were fine for a couple of years -then the problems started. The manufacturers would have calibrated each module within the equipment to ensure that it was working correctly at any and all frequencies in the range.. The a.n.other calibration house adjusted any module to bring the equipment into spec at their accredited test frequencies. At some frequencies the local oscillator would go unstable and spread over 100kHz of spectrum at low frequencies - and many MHz at high frequencies. Remember that the maker probably has the necessary jigs and custom test equipment, while the generic cal house probably does not. The maker probably charges a lot of money for the calibration - while the generic is cheaper. I only go to the manufacturer now, where high tech equipment is involved. The generic cal-house gets the attenuators, cables current probes etc. I hope that this helps. Regards Tim Tim Haynes A1N10 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG ( Tel : +44 (0)1582 886239 7 Fax : +44 (0)1582 795863 ) Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com P Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Luke Turnbull Sent: Friday, November 21, 2008 11:01 AM To: emcp...@aol.com; emc-p...@ieee.org Subject: Re: EMI Receivers *** WARNING *** This mail has originated outside your organization, either from an external partner or the Global Internet. Keep this in mind if you answer this message. Tim, RS receivers do not have to go back to the manufacturer. We have our receivers calibrated on site by a UK calibration lab. Luke Turnbull emcp...@aol.com 20 November 2008 19:39 Hello, I'm looking to purchase an EMI receiver for use in a 5 meter chamber. Does anyone recommend a certain model? I would want one that has at least a frequency range from 150kHz to 18GHz so one unit can be used for radiated and conducted emission measurements. I'm looking for a unit that can be calibrated by a local accredited calibration lab. I believe all RS receivers need to be sent to them for calibration, which there would be risk and time involved in shipping. Thanks, Tim Pierce One site has it all. Your email accounts, your social networks, and the things you love. Try the new AOL.com http://p .atwola.com/promoclk/10075x12129629 9x1200825291/aol?redir=http://www.aol.c m/?optin=new-dpicid=aolcom40vanityncid=emlcntaolcom0001 today! - 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 postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher j.bac...@ieee.org David Heald dhe...@gmail.com Conekt is a trading division of TRW Limited Registered in England, No. 872948 Registered Office Address: Stratford Road, Solihull B90 4AX - 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 postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher j.bac...@ieee.org David Heald dhe...@gmail.com SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or
RE: What's the deal with Wire Nuts?
Don, Hi. In your response to Brian you said... However, written into the body of the IEC 60950-1 and EN 60950-1 (and other national derivative standards) is a wiring method for permanent connection to the mains not acceptable in the US and Canada – the use of a non-detachable power supply cord for permanent connection. Can you please supply to me the reference that prohibits that wiring method in US and Canada? Regards Tim Tim Haynes A1N10 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG ( Tel : +44 (0)1582 886239 7 Fax : +44 (0)1582 795863 ) Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com P Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - 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 postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher j.bac...@ieee.org David Heald dhe...@gmail.com
RE: Radiated Emission Measurements above 1GHz
John, All, Sorry - I was wrong to suggest that standards should be found that would cover frequencies above 1GHz - because ALL harmonised standards under the EMC Directive are voluntary so there is no legal requirement to apply harmonised standards. Under 2004/108/EC it IS a legal requirement to make an EMC Assessment. The assessment might be done by 1 applying harmonised standards and, if you do so, you may presume conformity with the protection (or essential) requirements 2 making a full EMC assessment of the apparatus (using any available method including modelling and calculation, which may include using standards whether harmonised or not). Either 1 or 2 (or a combination) constitutes an EMC assessment. In either case, having completed the assessment [to your own satisfaction] you may declare conformity with the protection requirements using the evidence from the assessment. By not looking at an extended frequency range for emission and immunity, when you know the design employs technology in the extended frequency range, the manufacturer carries an unquantified risk. It is always preferable for the manufacturer to identify and (if possible) quantify the risk so that it may be mitigated if it is too high. As the banks and financial institutions have discovered, taking too much risk can seriously damage the business. Where would you rate a company who cannot be bothered to identify the risk at all? Regards Tim Tim Haynes A1N10 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG Tel : +44 (0)1582 886239 Fax : +44 (0)1582 795863 Mob: +44 (0)7703 559 310 E-mail : tim.hay...@selexgalileo.com Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of John Woodgate Sent: Friday, October 31, 2008 1:48 PM To: emc-p...@ieee.org Subject: Re: Radiated Emission Measurements above 1GHz *** WARNING *** This mail has originated outside your organization, either from an external partner or the Global Internet. Keep this in mind if you answer this message. In message 201048ea81ba0745aca78e4cc8839001037cf...@desmdswms201.des.grplnk.net, dated Fri, 31 Oct 2008, Haynes, Tim (SELEX GALILEO, UK) tim.hay...@selexgalileo.com writes: Remember that when you apply a standard you are doing so on the basis that the standard covers ALL the product EMC characteristics. IF you design a PC with a 3GHz clock and only apply a standard with a 1GHz limit and then there is a problem with real interference at 3GHz, the authorities may not believe that due diligence had been applied. So I would start asking - what does the product do - and then find standards that may be useful in making your EMC assessment. In almost all circumstances there is NO legal requirement in Europe to do this. If the applicable product standard does not cover a particular frequency range, the committee concerned saw no need for limits in that range, and by notifying the standard in the OJEC, the Commission has accepted that the standard gives prima facie evidence of complying with the Directive. You DO NOT have to trawl though all the EMC standards that exist, looking for another one to apply, almost certainly OUTSIDE ITS SCOPE. However, self-interest may suggest that if you know of any EMC effect not covered by the applicable standards, you should consider how to test and what VOLUNTARY limits to apply. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Either we are causing global warming, in which case we may be able to stop it, or natural variation is causing it, and we probably can't stop it. You choose! John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list.Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you
RE: Radiated Emission Measurements above 1GHz
Ghery, Rob, all Remember that when you apply a standard you are doing so on the basis that the standard covers ALL the product EMC characteristics. IF you design a PC with a 3GHz clock and only apply a standard with a 1GHz limit and then there is a problem with real interference at 3GHz, the authorities may not believe that due diligence had been applied. So I would start asking - what does the product do - and then find standards that may be useful in making your EMC assessment. Regards Tim Tim Haynes A1N10 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG Tel : +44 (0)1582 886239 Fax : +44 (0)1582 795863 Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of rehel...@mmm.com Sent: Friday, October 31, 2008 6:57 AM To: Pettit, Ghery Cc: emc-p...@ieee.org Subject: RE: Radiated Emission Measurements above 1GHz *** WARNING *** This mail has originated outside your organization, either from an external partner or the Global Internet. Keep this in mind if you answer this message. So if I understand this, there is no testing required for Europe above a gigahertz for EN 55022 at this time? Bob Heller 3M EMC Laboratory, 76-1-01 St. Paul, MN 55107-1208 Tel: 651- 778-6336 Fax: 651-778-6252 = Pettit, Ghery ghery.pettit@int el.com To rehel...@mmm.com 10/30/2008 04:47 rehel...@mmm.com PM cc emc-p...@ieee.org emc-p...@ieee.org Subject RE: Radiated Emission Measurements above 1GHz That is correct. It was quickly withdrawn and reissued without the limits above 1 GHz. I'm still waiting for my updated copy from Global, too. :-) From: rehel...@mmm.com [mailto:rehel...@mmm.com] Sent: Thursday, October 30, 2008 1:54 AM To: Pettit, Ghery Cc: emc-p...@ieee.org Subject: RE: Radiated Emission Measurements above 1GHz Ghery, are you saying that the BS version has the error and was withdrawn? If so we were not notified of this action by British Standards. We get their standards through their subscription service. Bob Heller 3M EMC Laboratory, 76-1-01 St. Paul, MN 55107-1208 Tel: 651- 778-6336 Fax: 651-778-6252 === Robert E. Heller/US-Corpora te/3M/US To Pettit, Ghery 10/30/2008 03:45 ghery.pet...@intel.com AM cc emc-p...@ieee.org emc-p...@ieee.org Subject RE: Radiated Emission Measurements above 1GHz(Document link: Robert E. Heller) So what is the bottom line? Are there or are there not limits for Europe (EN 55022) above a gig? I have copies of both BS EN 55022:2006 and BS EN 55022:2006 +A1:2007 Incorporating corrigendum no. 1. Both standards have a section 6.2 and both standards have limits from 1 to 6 GHz. BS EN 55022:2006 is listed in the OJ so I assume that it is valid. Bob Heller 3M EMC Laboratory, 76-1-01 St. Paul, MN 55107-1208 Tel: 651- 778-6336 Fax: 651-778-6252 Pettit, Ghery ghery.pettit@int el.com To Sent by: Jim Hulbert jim.hulb...@pb.com emc-p...@ieee.org Flavin, John john.fla...@teradata.com emc-p...@ieee.org 10/29/2008 08:45 emc-p...@ieee.org PM cc Subject RE: Radiated Emission Measurements above 1GHz You must have an early copy put out by BSI. They made a mistake and included Amendment 1 to CISPR 22, Edition 5.0 and withdrew it promptly when I pointed out their error. Limits above 1 GHz should not be included in EN 55022:2006. Ghery S. Pettit, NCE Convener, CISPR SC I WG3 From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Jim Hulbert Sent: Wednesday, October 29, 2008 10:09 AM To: Flavin, John; emc-p...@ieee.org Subject: RE: Radiated Emission Measurements above 1GHz EN 55022:2006 does indeed include the limits for radiated emissions in the range 1 GHz to 6 GHz. Look
RE: Radiated Emission Measurements above 1GHz
All, Sorry I should have said under the EMC Directive in relation to my last e-mail. Regards Tim Tim Haynes A1N10 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG Tel : +44 (0)1582 886239 Fax : +44 (0)1582 795863 Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com P Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list.Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
Test -
Tim Haynes A1N10 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG ( Tel : +44 (0)1582 886239 7 Fax : +44 (0)1582 795863 ) Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com P Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
Problem??
Hi - If you are reading this via the emc-pstc list server can you send a reply directly to me at the e-mail address below (I know 579 replies!) I think things have gone seriously wrong with my e-mails... Thanks Tim Tim Haynes A1N10 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG ( Tel : +44 (0)1582 886239 7 Fax : +44 (0)1582 795863 ) Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com P Please consider the environment before printing this email. SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
E-mail problem
Thanks to all that responded - to those who were just about to, please don't! I am getting the text below when I send an e-mail out of the UK. I have my e-mail team looking into this problem - but if you have seen this before and know what is causing it - please let me know. Thanks Tim jhechenber...@spaun.de - no such user here. Einen Benutzer dieses Namens gibt es auf diesem Server nicht. : Nachricht enthält [1] Datei-Anlagen There is also an attachment - but I am not going to open it or pass it on! Regards Tim Tim Haynes A1N10 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG ( Tel : +44 (0)1582 886239 7 Fax : +44 (0)1582 795863 ) Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com P Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: RF What-if (was: RE: Another Cancer Scare?)
HI, All I can see is a circular motorway (interstate?) marked in red... Regards Tim SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list.Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald:emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: RF What-if (was: RE: Another Cancer Scare?)
John Woodgate wrote... Zoom in. No, much more than that! Oh! Am I now supposed to say Goodness Me? (If it is, it doesn't look too healthy!) Is that why the fields around there are getting special treatment in terms of satellite resolution? Regards Tim SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: Another Cancer Scare?
Hi all, I have been on vacation but had planned to send this in - Some interesting facts (although some might argue with the numbers, they give a rough idea) There are roughly 61 million people in the UK One in 88 of these 61 million will die by this time next year. There is a one in 300 chance of dieing in a vehicle related accident while driving (in the lifetime) or roughly 0.5 million to one in any year over a 60 year driving lifetime. There is a 1 in 1000 chance of being killed in any one year if you are a deck-hand on a deep-sea trawler or a deep-sea diver. There is less than 1 in 1 million chance of being killed at work if you are an office worker. There are more mobile phones in use in the UK than there are adults... DIY in the UK accounts for 250,000 injuries and more than 70 deaths - ladder accidents account for 50 of those 70+ Children's toys are involved in over 4 accidents per year (mainly by tripping over them!) In 2006/2007 there were 241 workplace deaths in the UK Between 30 and 60 people are struck by lightning in the UK each year - of these 3 may die. Mobile phones are involved in accidents (with other contributory factors) A man died trying to recover his mobile phone from a drain. People have been killed using a mobile phone while driving or crossing the road. People have been murdered for their mobile phone. There are zero confirmed cases of death caused by RF radiation from a mobile phone since records (and mobile phones) began. there is no contest - I will keep using the mobile phone but it is TOO RISKY to go to work! Regards Tim Tim Haynes A1N21 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG ( Tel : +44 (0)1582 886239 7 Fax : +44 (0)1582 795863 ) Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com P Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: THERMOCOUPLE WELDER
Hi, For historic interest. Way back in the early 1970's I was employed by a company that made thermocouples. The smallest was 0.5mm diameter and was sheathed in stainless steel. The actual thermocouple wires were insulated from the sheath and themselves by magnesium oxide. We also designed, built and operated a capacitor discharge welder (CDW) to make the thermocouples. We would start with the raw cable on a reel and cut to length. We would then (using a microscope to view what we were doing) clean the area around the thermocouple wires, removing the MgO to expose sufficient to weld and the wires pushed together. The other end of the thermocouple wires were connected to the return of the CDW and then the capacitors were charged to the correct value. The welding torch was aligned with the thermocouple wires and argon gas was started to form an inert shield around the weld area. The discharge was executed and the weld inspected for quality and to make sure that the weld is inside the sheath. The final stage was to back-fill the sheath with MgO and fit a stainless steel cap over the (now insulated) thermocouple junction. The CDW was used to weld the cap in place. The cold end was terminated with flexible tails and encapsulated in a water-tight seal. These were used in nuclear power stations. The surprising thing to me was how little your hands would shake when working under the microscope ! The name of the company was BICC Pyrotenax. Regards Tim Tim Haynes A1N21 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG ( Tel : +44 (0)1582 886239 7 Fax : +44 (0)1582 795863 ) Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com P Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Nick Williams Sent: Monday, July 21, 2008 8:47 PM To: Bolintineanu, Constantin Cc: emc-p...@ieee.org Subject: Re: THERMOCOUPLE WELDER *** WARNING *** This mail has originated outside your organization, either from an external partner or the Global Internet. Keep this in mind if you answer this message. It never occurred to me that someone might make a special gadget for this job - I just use our workshop oxy-acetylene torch! Nick. At 15:04 -0400 18/7/08, Bolintineanu, Constantin wrote: Dear Colleagues, I would like to kindly ask you in regard to the THERMOCOUPLES WELDERS that you are using. Information regarding the suppliers, and best performances and reliability, with not to many headaches are very much appreciated. I must admit that what we found is not an approved type... I would prefer to understand which is the best solution without using too many consumables. Please accept in advance my many thanks for your replies. Respectfully yours, Constantin Constantin Bolintineanu P.Eng. TYCO SAFETY PRODUCTS CANADA 3301 LANGSTAFF Road, L4K 4L2 CONCORD, ONTARIO, CANADA e-mail: cbolintine...@tycoint.com Tel: 905 760 3000 ext 2568 Fax: 905 760 3020 - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list.Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald:emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list.Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell
Test - e-mail address change
Tim Haynes A1N21 Electromagnetic Engineering Specialist SELEX GALILEO 300 Capability Green Luton LU1 3PG ( Tel : +44 (0)1582 886239 7 Fax : +44 (0)1582 795863 ) Mob: +44 (0)7703 559 310 * E-mail : tim.hay...@selexgalileo.com P Please consider the environment before printing this email. SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
