RE: UL and multiple brand names
To avoid (the cost of) multiple listing: The UL file number does not have to be placed on the product. There is no reference to the manufacturer required anywhere on the product. UL assigns a control number to your Listing mark. This control number is proprietary with UL and not available to anyone unless. It is for their use only. Of course, some-one who has lots of time may compare this controlnumber between different products and finally makes a link to the UL filenumber of the listee. Regards, Kris -Original Message- From: Joshua Wiseman [mailto:jwise...@printronix.com] Sent: donderdag 14 november 2002 17:59 To: 'Peter Merguerian'; 'Dave Grant'; emc-p...@majordomo.ieee.org Subject: RE: UL and multiple brand names The first is much more cost effective. With the second you have to pay the maintenance fee for both files. Josh Wiseman EMC/Product Safety -Original Message- From: Peter Merguerian [ mailto:pmerguer...@itl.co.il mailto:pmerguer...@itl.co.il ] Sent: Thursday, November 14, 2002 2:45 AM To: 'Dave Grant'; emc-p...@majordomo.ieee.org Subject: RE: UL and multiple brand names Dave, The most common way is to add all the brand names in the same UL Report and mark your file number (EXX) on the product by the listing Mark. The customer must of course agree to have your UL file number on the product. Under this program , only the original Listee's products will be in UL's published directories and On-Line databases. There is another way; Mutltiple Listing Program. You test the unit once. Under this program the OEM and your company must sign a Multiple Listing form with UL. Here, both companies will have a file number and each will be published in UL's published directories and On-Line databases. Best Regards
RE: Radiated immunity testing above 1 GHz
Richard, My previous experience with TWT amplifiers is that as you say they do not like excessive VSWR's. Chamber efects is one thing that would cause bad VSWR. Another way is turning them on before the antenna is attached. Another way is to misthread the acble attached to the TWT. I seem to remember that certain TWT's came with an option of an isolator on the input that made them better able to handle short term bad VSWR's. If the one you are looking at has this option it would be a plus. My general experience is be very carfeul with them and still they may not last that long. Check the repair history of the used TWT if you can. Sandy Mazzola -Original Message- From: richwo...@tycoint.com [mailto:richwo...@tycoint.com] Sent: Wednesday, November 13, 2002 9:00 AM To: emc-p...@majordomo.ieee.org Subject: Radiated immunity testing above 1 GHz I need to make a decision on an amplifier for radiated immunity testing in the 1-2 GHz range. The choices appear to be a new solid state amplifier ( I have not located a used one) or a used TWT amp. Is anyone using a TWT amplifier for radiated immunity testing above 1 GHz? Do I need to be concerned about protecting the tube from damage caused by excessive VSWR cause by, perhaps, chamber effects? Is there anything else I need to know about TWT amps (yeah, I know - throw it way if the tube dies)? Richard Woods Sensormatic Electronics Tyco International --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: UL and multiple brand names
Negotiate with customer. If he doesn't want your UL file number have him pay the ML costs. In my dealings hasn't been a real problem either way. Gary -Original Message- From: Joshua Wiseman [mailto:jwise...@printronix.com] Sent: Thursday, November 14, 2002 8:59 AM To: 'Peter Merguerian'; 'Dave Grant'; emc-p...@majordomo.ieee.org Subject: RE: UL and multiple brand names The first is much more cost effective. With the second you have to pay the maintenance fee for both files. Josh Wiseman EMC/Product Safety -Original Message- From: Peter Merguerian [ mailto:pmerguer...@itl.co.il] Sent: Thursday, November 14, 2002 2:45 AM To: 'Dave Grant'; emc-p...@majordomo.ieee.org Subject: RE: UL and multiple brand names Dave, The most common way is to add all the brand names in the same UL Report and mark your file number (EXX) on the product by the listing Mark. The customer must of course agree to have your UL file number on the product. Under this program , only the original Listee's products will be in UL's published directories and On-Line databases. There is another way; Mutltiple Listing Program. You test the unit once. Under this program the OEM and your company must sign a Multiple Listing form with UL. Here, both companies will have a file number and each will be published in UL's published directories and On-Line databases. Best Regards
RE: UL and multiple brand names
I have to clarify my response to the forum, as I did with Josh. There's no extra cost UNLESS the form is filled-out as such. It's how the form is filled out, and the deal that was worked out between the two companies. The Multiple Listing application (known as 'Dual Authorization and Request Form') has a section on page 2 for 'Mailing and Billing Information'. The section is to be filled out if . . . the Multiple Listing invoices or Listing Information Page should be mailed to someone other (this is underlined) the ML representative below. There's also a note All Multiple Listing invoices will be sent to the Multiple Listee unless otherwise noted. Sorry for any confusion. John A. Juhasz GE Interlogix Fiber Options Div. Bohemia, NY -Original Message- From: Juhasz, John (IndSys, GE Interlogix) Sent: Thursday, November 14, 2002 1:12 PM To: Joshua Wiseman; emc-p...@majordomo.ieee.org Subject: RE: UL and multiple brand names The Multiple listee pays the cost of the second file. The original applicant only pays for it's file. There is no extra cost to bear by the original applicant. John A. Juhasz GE Interlogix Fiber Options Div. Bohemia, NY -Original Message- From: Joshua Wiseman [mailto:jwise...@printronix.com] Sent: Thursday, November 14, 2002 11:59 AM To: 'Peter Merguerian'; 'Dave Grant'; emc-p...@majordomo.ieee.org Subject: RE: UL and multiple brand names The first is much more cost effective. With the second you have to pay the maintenance fee for both files. Josh Wiseman EMC/Product Safety -Original Message- From: Peter Merguerian [ mailto:pmerguer...@itl.co.il] Sent: Thursday, November 14, 2002 2:45 AM To: 'Dave Grant'; emc-p...@majordomo.ieee.org Subject: RE: UL and multiple brand names Dave, The most common way is to add all the brand names in the same UL Report and mark your file number (EXX) on the product by the listing Mark. The customer must of course agree to have your UL file number on the product. Under this program , only the original Listee's products will be in UL's published directories and On-Line databases. There is another way; Mutltiple Listing Program. You test the unit once. Under this program the OEM and your company must sign a Multiple Listing form with UL. Here, both companies will have a file number and each will be published in UL's published directories and On-Line databases. Best Regards
Admin Comment - Virus discussions
All, Please remember that postings about viruses (no matter how well meaning - and even about those that appear on the listserver) are strongly discouraged on this forum. Such postings add to the noise on the forum and can greatly slow email access times for those with dial-up connections. Please reference the last section of paragraph 5 in the Charter and Guidelines that was sent to every one of you when you joined the list. If you do not still have this message, the guidelines can be obtained by sending a message to majord...@majordomo.ieee.org with no subject and the two folloing lines in the body of the message info emc-pstc end If you have virus concerns that directly effect the list, please address them to the list admins directly. (our email addresses are at the bottom of every post). Best Regards, Dave Heald EMC-PSTC Admin --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: UL and multiple brand names
The Multiple listee pays the cost of the second file. The original applicant only pays for it's file. There is no extra cost to bear by the original applicant. John A. Juhasz GE Interlogix Fiber Options Div. Bohemia, NY -Original Message- From: Joshua Wiseman [mailto:jwise...@printronix.com] Sent: Thursday, November 14, 2002 11:59 AM To: 'Peter Merguerian'; 'Dave Grant'; emc-p...@majordomo.ieee.org Subject: RE: UL and multiple brand names The first is much more cost effective. With the second you have to pay the maintenance fee for both files. Josh Wiseman EMC/Product Safety -Original Message- From: Peter Merguerian [ mailto:pmerguer...@itl.co.il] Sent: Thursday, November 14, 2002 2:45 AM To: 'Dave Grant'; emc-p...@majordomo.ieee.org Subject: RE: UL and multiple brand names Dave, The most common way is to add all the brand names in the same UL Report and mark your file number (EXX) on the product by the listing Mark. The customer must of course agree to have your UL file number on the product. Under this program , only the original Listee's products will be in UL's published directories and On-Line databases. There is another way; Mutltiple Listing Program. You test the unit once. Under this program the OEM and your company must sign a Multiple Listing form with UL. Here, both companies will have a file number and each will be published in UL's published directories and On-Line databases. Best Regards
RE: UL and multiple brand names
The first is much more cost effective. With the second you have to pay the maintenance fee for both files. Josh Wiseman EMC/Product Safety -Original Message- From: Peter Merguerian [mailto:pmerguer...@itl.co.il] Sent: Thursday, November 14, 2002 2:45 AM To: 'Dave Grant'; emc-p...@majordomo.ieee.org Subject: RE: UL and multiple brand names Dave, The most common way is to add all the brand names in the same UL Report and mark your file number (EXX) on the product by the listing Mark. The customer must of course agree to have your UL file number on the product. Under this program , only the original Listee's products will be in UL's published directories and On-Line databases. There is another way; Mutltiple Listing Program. You test the unit once. Under this program the OEM and your company must sign a Multiple Listing form with UL. Here, both companies will have a file number and each will be published in UL's published directories and On-Line databases. Best Regards
RE: W32.Elkern removal tools
I got a virus message from this email. See below. Josh Wiseman EMC/Product Safety -Original Message- From: lfresearch [mailto:lfresea...@aol.com] Sent: Thursday, November 14, 2002 3:12 AM To: emc-p...@majordomo.ieee.org Subject: W32.Elkern removal tools -- Virus Warning Message (on gemini4) install.exe is removed from here because it contains a virus. -
RE: Books on Intrinsic safety and ATEX
Chris, I'm copying a response I gave back in July on this subject. The R. Stahl link is very helpful. Best regards, Dave 512.695.5871 www.lorusso.com = This brings back a lot of memories; my first job out of college was with Factory Mutual Research Corporation (www.fmglobal.com) doing hazardous location approvals. Instead of reinventing the wheel (and digging deep into memory), here's a link to an excellent primer on explosion protection by R. Stahl, one of my first clients. http://www.rstahl.com/Exprotection/index.htm Click on the pdf Basics of Explosion Protection for an in depth look at this subject. It's about 4.5 Mb. The answers to your questions are in there plus a whole lot more. Good luck and best regards, Dave Lorusso Lorusso Technologies, LLC www.lorusso.com 512.695.5871 --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: W32.Elkern removal tools
Do you know if this bug came through the IEEE fire wall? Any more info available? I went to the F-sure site but was unsure if I should download the removal tool. Anyone use it yet? Jim Jim -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of lfresearch Sent: Thursday, November 14, 2002 6:12 AM To: emc-p...@majordomo.ieee.org Subject: W32.Elkern removal tools W32.Elkern is a very dangerous virus that can infect on Win98/Me/2000/XP. F-Secure give you the very W32.Elkern removal tools For more information,please visit http://www.F-Secure.com
RE: W32.Elkern removal tools
Do you know if this bug came through the IEEE fire wall? Any more info available? I went to the F-sure site but was unsure if I should download the removal tool. Anyone use it yet? Jim -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of lfresearch Sent: Thursday, November 14, 2002 6:12 AM To: emc-p...@majordomo.ieee.org Subject: W32.Elkern removal tools W32.Elkern is a very dangerous virus that can infect on Win98/Me/2000/XP. F-Secure give you the very W32.Elkern removal tools For more information,please visit http://www.F-Secure.com
RE: Antenna mast
Hello, Check www.hdusa.net HDusa. regards, Ken Hall -Original Message- From: KC CHAN [PDD] [mailto:kcc...@hkpc.org] Sent: Wednesday, November 13, 2002 8:22 PM To: emc-p...@majordomo.ieee.org Subject: Antenna mast Dear all I would like to see if anyone who knows the contract of HD GmbH in Germany as I have one antenna mast, MA-240 that need to be fixed. The office in US said they cannot provide repair service. Or any service centre in Asian area? Thank you KC Chan --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: UL and multiple brand names
On November 14, Dave Grant wrote: We will be shipping identical products to the USA under two brand names. Can we obtain UL certification for one brand name only and use the same UL certification for the other brand name? If the products are truly identical, only one evaluation is needed. Both models would be included in the report. Both models would have the same UL File Number. The UL Project Enginneer you will be dealing with will probably want to see a sample of each version. A differnt type of paint on a plastic enclosure, for example, may require a fire analysis. Regards, Eric Petitpierre Pulsecom Herndon, VA eric.petitpie...@pulse.com ** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept for the presence of computer viruses. www.hubbell.com - Hubbell Incorporated ** --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: UL and multiple brand names
Dave, John is correct in you do need to discuss it with UL. You only need to send one product to UL to test. There will be some additional cost, but not much. The amount will depend on how you go about it and what your and the customers needs are. We have done it several different ways and all are easy. For one customer we just added their name and model as alternate construction. For another we did it as a multiple listing. Jim Jim Bacher, Senior Engineer Paxar Corp. e-mail: jim.bac...@paxar.com voice: 1-937-865-2020 fax: 1-937-865-2048 --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Books on Intrinsic safety and ATEX
Group, The last response to recommended reading on basic EMC was very good. Are there some recommended texts on application of the intrinsic safety standards, designing for I.S. and/or application of the directive? Any thoughts/pointers welcome Best regards - Chris Chileshe - Ultronics Ltd, UK This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
W32.Elkern removal tools
attachment: 5937_notebook_trioffer1[1].jpg
RE: IEC60065 and Canadian requirements
CSA has far to many National Differences to list, I'm afraid you'll have to purchase the standard from CSA. Sorry. (Maybe NEMKO can help you? They have an agreement with CSA). Chris Colgan Compliance Engineer TAG McLaren Audio Ltd The Summit, Latham Road Huntingdon, Cambs, PE29 6ZU *Tel: +44 (0)1480 415 627 *Fax: +44 (0)1480 52159 * Mailto:chris.col...@tagmclaren.com * http://www.tagmclaren.com -Original Message- From: am...@westin-emission.no [SMTP:am...@westin-emission.no] Sent: Wednesday, November 13, 2002 7:22 PM To: emc-p...@majordomo.ieee.org Subject: IEC60065 and Canadian requirements Safety folks, Assume testing according to IEC60065, which other tests / requirements will be in addition for Canada (national requirements) ? Best regards Amund Westin, Oslo / Norway ** Please visit us at www.tagmclaren.com ** The contents of this E-mail are confidential and for the exclusive use of the intended recipient. If you receive this E-mail in error, please delete it from your system immediately and notify us either by E-mail, telephone or fax. You should not copy, forward or otherwise disclose the content of the E-mail. Important Note: Any typographical, clerical or other error in this communication is subject to correction without any liability on the part of TAG McLaren Audio Limited. Any orders placed shall be subject to acceptance by TAG McLaren Audio Limited on its standard terms and conditions of sale which shall govern the contract for the sale and purchase of the products ordered to the exclusion of any other terms and conditions. TAG McLaren Audio Ltd The Summit, 11 Latham Road Huntingdon, Cambs, PE29 6ZU Telephone : 01480 415600 (+44 1480 415600) Facsimile : 01480 52159 (+44 1480 52159) ** Please visit us at www.tagmclaren.com ** --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: A Different Kind of EMC Problem
Following the thread on this discussion reminds me of a problem that I had when I first graduated. I worked in a TV studio equipment RD lab where dc power was wired around the building. At one point I experienced considerable noise problems at the output of a video amplifier function that I was designing. Trying to locate where this occurred, I thought that the noise looked more like an audio signal than random noise. An ear-phone soon proved this to be the case. After a little investigation I found that the long dc cables were acting as an aerial picking up an AM radio station. This was then being demodulated in my circuit with the resultant noise. Needless to say, the distributed dc line didn't last much longer. Regards, Neil Helsby ** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ** --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
e-mark for automotive equipment
I am interested in answers to the following:- 1. Is e-mark applied to components or units? For example, a hand phone, a handsfree kit and cigarette adapter. They might be sold in a unit of product or separately. Obviously, the hand phone is not only designed to work in car and it carries normal CE mark. The handsfree kit and cigarette adapter are designed to work in car. They have to be e-marked. Is the whole set: hand phone, handsfree kit and cigarette adapter, required to be subject to e-mark test? 2. Where is the e-mark affixed? Hand phone, handsfree kit or cigarette adapter, or all of them. 3. Individual approval In practical, these three components are designed and/or manufactured by different suppliers. The component suppliers may have got the e-mark on its components. Is it allowed to have different e-marks on the components of a unit of product? Your advice is appreciated. Raymond Li Omni Source Asia Ltd.
Antenna mast
Dear all I would like to see if anyone who knows the contract of HD GmbH in Germany as I have one antenna mast, MA-240 that need to be fixed. The office in US said they cannot provide repair service. Or any service centre in Asian area? Thank you KC Chan --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Radiated immunity testing above 1 GHz
-Original Message- From: richwo...@tycoint.com [mailto:richwo...@tycoint.com] Sent: Wednesday, November 13, 2002 6:00 AM To: emc-p...@majordomo.ieee.org Subject: Radiated immunity testing above 1 GHz I need to make a decision on an amplifier for radiated immunity testing in the 1-2 GHz range. The choices appear to be a new solid state amplifier ( I have not located a used one) or a used TWT amp. Is anyone using a TWT amplifier for radiated immunity testing above 1 GHz? Do I need to be concerned about protecting the tube from damage caused by excessive VSWR cause by, perhaps, chamber effects? Is there anything else I need to know about TWT amps (yeah, I know - throw it way if the tube dies)? Richard Woods Sensormatic Electronics Tyco International Rich: A 1 Watt TWT octave-band amplifier is fairly common, and I have seen them sell on eBay for a few hundred dollars. But 1 Watt (depending on antenna performance system losses) just barely gets you in to the lowest end of immunity testing. A 10 Watt amplifier might cost under $7k new, and would be a rare find at an auction or from an inventory reduction at an equipment rental company. But 10 Watts will let you do most commercial immunity work. A 20 Watt amplifier takes the edge off of trying to get the fields, and also lets you do military work (with some patience). I use a set of Hughes 8050 20 Watt amps that cover 1 GHz to 18 GHz. In a previous life, I had the luxury of 200 and 300 Watt TWT amplifiers. They were the Varian VZ series, and I seem to recall they cost around $30k each (in 1980 dollars). I don't know if anyone even makes new equipment like that any more; maybe you can't even replace the TWT's in them. Whatever you get, try to be sure that the amps have circulator protection. TWT's don't like reflected power, and immunity setups almost guarantee ranges of lousy VSWR. The circulator routes that reflected power away from the TWT and into a termination. Most lab amplifiers will either come with a circulator as standard, or have it as a factory option. If you get an amp that doesn't have an internal circulator, endeavor to get an external one ASAP. Re TWT amp operation. The tube makes up maybe 80% of the amplifier cost. Every time I flip on the TWT amp switch, my finger twitches a little. TWT amps don't seem to ever die while in use; rather, they die just as you start them up. I'm very cautious about protecting the amp from physical shock, and I always let the main power stay on for about 5 minutes after RF operation to let the TWT cool down as much as possible. One further suggestion; place the TWT amp as close as possible to the antenna. Since a TWT amp will have about 40 dB of gain, you can usually afford to lose a few dB in a long coax between the signal source and the amp, and still be able to drive the TWT to its limit. This arrangement will but maximum power to your antenna. All of the TWT amps I have ever used would withstand whatever RF was inside the shielded room, maybe since they were relatively dumb amplifiers. You might have a problem with this technique if your TWT amp has a microprocessor controller or some other fancy features. And, even for the 1 GHz to 2 GHz range, don't use even good coax, like RG-214. Get either semi-rigid solid wall coax, or get the superb flexible stuff from Gore or Storm. Finally, make sure that your leveling pre-amplifier will control the entire frequency range you are going to use. Some systems (like my IFI LPA-5) might require an optional variable-gain amplifier deck for frequencies above 1 GHz. (Maybe this isn't an issue for you, if you are controlling level by computer control of the signal source amplitude.) Regards, Ed Ed Price ed.pr...@cubic.com Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (Fax) Military Avionics EMC Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
UL and multiple brand names
Hello All We are looking at breaking into the United States with our product and a question has arisen. We will be shipping identical products to the USA under two brand names. Can we obtain UL certification for one brand name only and use the same UL certification for the other brand name? or Do we have to send the same product twice to UL to have them certify the same identical product under two different brand names? I look forward to your replies. Dave Grant --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
