Re: [PSES] California Prop 65
*Warning* Contains peanuts. I wonder if it is a violation of Prop 65 to knowingly report as present _substances one has not even looked for_. They must be there; put up a sign! makes notification meaningless. Cortland Richmond ka5s On 7/11/2013 2255, Scott Douglas wrote: When I first came to California to interview for a job, my hotel had these signs displayed prominently at each entrance door. Made me wonder why I wanted to stay in a hotel that had so much evil stuff in it. And also m - 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
Re: [PSES] California Prop 65
Moshe OEHHA is the lead agency for implementation of Proposition 65 (the Safe Drinking Water and Toxic Enforcement Act of 1986, Health and Safety Code section 25249.5 et seq. referred to as Proposition 65 or the Act). As part of its responsibilities related to Proposition 65, OEHHA maintains the regulations implementing the Act. These regulations can be found in Title 27 of the California Code of Regulations, section 25000 through 27000 Best Regards Sent from my iPhone Peter S. Merguerian pe...@goglobalcompliance.com Go Global Compliance Inc. www.goglobalcompliance.com (408) 931-3303 On Jul 11, 2013, at 5:19 AM, Moshe Henig moshe.he...@gmail.com wrote: Hello team, I am looking for California Prop 65 requirements and on which equipment or when it is applied. Can you please advise Thanks Moshe - 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher j.bac...@ieee.org David Heald dhe...@gmail.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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
[PSES] EMC Required?
Hi folks, Consider a simple circuit. IR diode, a transistor or two, some resistors and caps. Receives input from IR remote, converts to electrical and sends down a wire. No clock in the thing so you could call is passive. But does it need EMC testing for US or EU? The IR signal will be in the 35-50 kHz range so pulses down the wire will be the same. Does this make it fit within the realm of EMC required? The device is sold by itself without other products, but is always connected to something else in use. Something else could be a wide variety of anything. I think of it like a stand-alone audio speaker. Purely a passive device that is driven by signals that fall within the EMC required realm. So do you do EMC or not? Looking forward to your opinions on this. Scott - 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
Re: [PSES] EMC Required?
Scott- I have seen some really simple circuits using common, cheap transistors that had unwanted oscillations in the range of 100 to 200 MHz, which failed radiated emissions. The most recent one was similar to your circuit, though in the opposite direction -- a simple circuit with a few transistors driving the LED of an optocoupler for low speed digital data. The fix was simple (a small resistor in series with the base lead of the bipolar transistor driving the LED), but the test was essential, as the circuit otherwise performed without a problem. Don Borowski EMC Compliance Engineer Schweitzer Engineering Labs Pullman, WA, USA From: Scott Douglas sdoug...@radiusnorth.net To: emc-p...@ieee.org emc-p...@ieee.org Date: 07/12/2013 06:46 AM Subject:EMC Required? Sent by:emc-p...@ieee.org Hi folks, Consider a simple circuit. IR diode, a transistor or two, some resistors and caps. Receives input from IR remote, converts to electrical and sends down a wire. No clock in the thing so you could call is passive. But does it need EMC testing for US or EU? The IR signal will be in the 35-50 kHz range so pulses down the wire will be the same. Does this make it fit within the realm of EMC required? The device is sold by itself without other products, but is always connected to something else in use. Something else could be a wide variety of anything. I think of it like a stand-alone audio speaker. Purely a passive device that is driven by signals that fall within the EMC required realm. So do you do EMC or not? Looking forward to your opinions on this. Scott - 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
Re: [PSES] EMC Required?
In message 51e0090c.6000...@radiusnorth.net, dated Fri, 12 Jul 2013, Scott Douglas sdoug...@radiusnorth.net writes: Purely a passive device that is driven by signals that fall within the EMC required realm. So do you do EMC or not? For Europe, it does require immunity testing (EN 55024 at present). For emissions, you just state in the EMC Assessment that it does not emit. For the case cited by Don Borowski, yes, you do need to check that nothing is oscillating at HF to UHF, but you do not need to do formal emission testing. -- OOO - Own Opinions Only. See www.jmwa.demon.co.uk Why is the stapler always empty just when you want it? 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
Re: [PSES] EMC Required?
HI Scott, I'd like to reinforce what Don has said. I flew to Scotland in the early days of CE with a product that should have aced emissions and we were worried about susceptibility. It failed emissions and passed susceptibility. The 3 transistor circuit was singing away around 70 MHz. I'm always reminded of the old saying we test to confirm our design is good Cheers, Derek. -Original Message- From: Don_Borowski don_borow...@selinc.com To: emc-pstc emc-p...@ieee.org Cc: Scott Douglas sdoug...@radiusnorth.net Sent: Fri, Jul 12, 2013 9:16 am Subject: Re: EMC Required? Scott- I have seen some really simple circuitsusing common, cheap transistors that had unwanted oscillations in the rangeof 100 to 200 MHz, which failed radiated emissions. The most recent one was similar to yourcircuit, though in the opposite direction -- a simple circuit with a fewtransistors driving the LED of an optocoupler for low speed digital data.The fix was simple (a small resistor in series with the base lead of thebipolar transistor driving the LED), but the test was essential, as thecircuit otherwise performed without a problem. Don Borowski EMC Compliance Engineer Schweitzer Engineering Labs Pullman, WA, USA From: Scott Douglas sdoug...@radiusnorth.net To: emc-p...@ieee.orgemc-p...@ieee.org Date: 07/12/2013 06:46 AM Subject: EMC Required? Sent by: emc-p...@ieee.org Hi folks, Consider a simple circuit. IR diode, a transistor or two, some resistors and caps. Receives input from IR remote, converts to electrical and sends down a wire. No clock in the thing so you could call is passive. But does it need EMC testing for US or EU? The IR signal will be in the 35-50 kHz range so pulses down the wire will be the same. Does this make it fit within the realm of EMC required? The device is sold by itself without other products, but is always connected to something else in use. Something else could be a wide variety of anything. I think of it like a stand-alone audio speaker. Purely a passive device that is driven by signals that fall within the EMC required realm. So do you do EMC ornot? Looking forward to your opinions on this. Scott - 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 LT;emc-p...@ieee.orgGT; All emc-pstc postings are archived and searchable on the web at:http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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 LT;emcp...@radiusnorth.netGT; Mike Cantwell LT;mcantw...@ieee.orgGT; For policy questions, send mail to: Jim Bacher LT;j.bac...@ieee.orgGT; David Heald LT;dhe...@gmail.comGT; - 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
Re: [PSES] EMC Required?
Scott I have also had the same experience with a similar simple circuit going into oscillation on a vehicle and causing all sorts of problems - at around the 60 to 70 MHz range. Russ Beattie From: Derek Walton lfresea...@aol.com To: don_borow...@selinc.com; emc-p...@ieee.org Cc: sdoug...@radiusnorth.net Sent: Friday, July 12, 2013 11:12 AM Subject: Re: EMC Required? HI Scott, I'd like to reinforce what Don has said. I flew to Scotland in the early days of CE with a product that should have aced emissions and we were worried about susceptibility. It failed emissions and passed susceptibility. The 3 transistor circuit was singing away around 70 MHz. I'm always reminded of the old saying we test to confirm our design is good Cheers, Derek. -Original Message- From: Don_Borowski don_borow...@selinc.com To: emc-pstc emc-p...@ieee.org Cc: Scott Douglas sdoug...@radiusnorth.net Sent: Fri, Jul 12, 2013 9:16 am Subject: Re: EMC Required? Scott- I have seen some really simple circuits using common, cheap transistors that had unwanted oscillations in the range of 100 to 200 MHz, which failed radiated emissions. The most recent one was similar to your circuit, though in the opposite direction -- a simple circuit with a few transistors driving the LED of an optocoupler for low speed digital data. The fix was simple (a small resistor in series with the base lead of the bipolar transistor driving the LED), but the test was essential, as the circuit otherwise performed without a problem. Don Borowski EMC Compliance Engineer Schweitzer Engineering Labs Pullman, WA, USA From: Scott Douglas sdoug...@radiusnorth.net To: emc-p...@ieee.org emc-p...@ieee.org Date: 07/12/2013 06:46 AM Subject: EMC Required? Sent by: emc-p...@ieee.org Hi folks, Consider a simple circuit. IR diode, a transistor or two, some resistors and caps. Receives input from IR remote, converts to electrical and sends down a wire. No clock in the thing so you could call is passive. But does it need EMC testing for US or EU? The IR signal will be in the 35-50 kHz range so pulses down the wire will be the same. Does this make it fit within the realm of EMC required? The device is sold by itself without other products, but is always connected to something else in use. Something else could be a wide variety of anything. I think of it like a stand-alone audio speaker. Purely a passive device that is driven by signals that fall within the EMC required realm. So do you do EMC or not? Looking forward to your opinions on this. Scott - 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 LT;emc-p...@ieee.orgGT; All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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 LT;emcp...@radiusnorth.netGT; Mike Cantwell LT;mcantw...@ieee.orgGT; For policy questions, send mail to: Jim Bacher LT;j.bac...@ieee.orgGT; David Heald LT;dhe...@gmail.comGT; - 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher j.bac...@ieee.org David Heald dhe...@gmail.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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used
Re: [PSES] Secondary cable
D1 - Article 725 of NEC would apply to Class 2/LPS materials, where not used with haz-V stuff. Did ya read anx NAE of the std? Read any good SciFi noves lately? Brian -Original Message- From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Boštjan Glavič Sent: Thursday, July 11, 2013 1:00 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Secondary cable Dear experts, Does anyone know if it is required to use approved secondary cable on a direct plug-in power supply, where output meets limited power source (also meets class 2 according to UL1310). Power supply is intended for US/CAN market and it tested according to UL/CSA 60950-1. There is mentioned something in clause 1.5.5, but it is not clear for me. Is it enough that material used complies with VW-1 or FT-1 or complete cable needs to be certified? Is it enough to use normal PVC cable? - 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
[PSES] Free EMC presentation during the EMC Symposium (Denver)
Hi All, For those planning to attend the EMC Symposium in Denver this year, I've been invited to be the keynote speaker at the annual NEC EMIStream evening seminar and reception Thursday, August 8th, from 5:30 to 7:00 PM. The title of my presentation is EMC Troubleshooting and Pre-Compliance Testing on a Budget. For more details and to register for this free event, check out this link. http://lnkd.in/C37sAZ Cheers, Ken ___ Kenneth Wyatt Wyatt Technical Services LLC Woodland Park, CO Email Me! | Web Site | Blog The EMC Blog (TM World) Subscribe to Newsletter Connect with me on LinkedIn - 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
[PSES] Chambers for link budget testing
Hello all, I am looking for a chamber that would be suitable for testing link budgets (i.e. from one system to another) preferably here in Colorado. Does anyone know of such a chamber? Best Regards Charles Grasso Compliance Engineer Echostar Communications (w) 303-706-5467 (c) 303-204-2974 (t) 3032042...@vtext.com (e) charles.gra...@echostar.com (e2) chasgra...@gmail.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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
Re: [PSES] Chambers for link budget testing
Have no answer, but have questions because I am an EMC amateur, and thought that this could be done at any OATS or 10m chamber. Thought that link budget was done using parameters of free space loss and rx sensitivity and tx power. For this characterization, why is a speacil chamber required? Would this also done using other than line of site and changes in enviroment, antenna alignment, etc? Is this the same thing as 'fade margin'? Brian -Original Message- From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Grasso, Charles Sent: Friday, July 12, 2013 2:28 PM To: emc-p...@ieee.org Subject: Chambers for link budget testing Hello all, I am looking for a chamber that would be suitable for testing link budgets (i.e. from one system to another) preferably here in Colorado. Does anyone know of such a chamber? - 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
Re: [PSES] EMC Required?
For the USA, any electrical signal above 9 kHz meets the requirement to be tested. I think we will find similar for the EU. EN 300 330, or 300 440, or something like that. It has power and a switch and generates frequencies above the lower limit - it gets tested. ps. that means the device will need to be activated into its operating condition for testing. But if there is an exclusion list... I'm very interested! From: Scott Douglas sdoug...@radiusnorth.net To: emc-p...@ieee.org emc-p...@ieee.org Sent: Friday, July 12, 2013 9:47 AM Subject: EMC Required? Hi folks, Consider a simple circuit. IR diode, a transistor or two, some resistors and caps. Receives input from IR remote, converts to electrical and sends down a wire. No clock in the thing so you could call is passive. But does it need EMC testing for US or EU? The IR signal will be in the 35-50 kHz range so pulses down the wire will be the same. Does this make it fit within the realm of EMC required? The device is sold by itself without other products, but is always connected to something else in use. Something else could be a wide variety of anything. I think of it like a stand-alone audio speaker. Purely a passive device that is driven by signals that fall within the EMC required realm. So do you do EMC or not? Looking forward to your opinions on this. Scott - 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
Re: [PSES] EMC Required?
Thanks to all for the comments. Your stories reminded me of an audio amp oscillating in the 20 MHz range caused by PCB layout. A cap here and a cap there fixed it. But that was a product that expected and needed EMC testing. This passive thing may not be as passive as I thought. And thanks to John who reminded that immunity testing will also be required. As always, the list comes through to remind of things forgotten. Thank you. Scott On 7/12/2013 8:26 AM, Russell Beattie wrote: Scott I have also had the same experience with a similar simple circuit going into oscillation on a vehicle and causing all sorts of problems - at around the 60 to 70 MHz range. Russ Beattie *From:* Derek Walton lfresea...@aol.com *To:* don_borow...@selinc.com; emc-p...@ieee.org *Cc:* sdoug...@radiusnorth.net *Sent:* Friday, July 12, 2013 11:12 AM *Subject:* Re: EMC Required? HI Scott, I'd like to reinforce what Don has said. I flew to Scotland in the early days of CE with a product that should have aced emissions and we were worried about susceptibility. It failed emissions and passed susceptibility. The 3 transistor circuit was singing away around 70 MHz. I'm always reminded of the old saying we test to confirm our design is good Cheers, Derek. -Original Message- From: Don_Borowski don_borow...@selinc.com To: emc-pstc emc-p...@ieee.org Cc: Scott Douglas sdoug...@radiusnorth.net Sent: Fri, Jul 12, 2013 9:16 am Subject: Re: EMC Required? Scott- I have seen some really simple circuits using common, cheap transistors that had unwanted oscillations in the range of 100 to 200 MHz, which failed radiated emissions. The most recent one was similar to your circuit, though in the opposite direction -- a simple circuit with a few transistors driving the LED of an optocoupler for low speed digital data. The fix was simple (a small resistor in series with the base lead of the bipolar transistor driving the LED), but the test was essential, as the circuit otherwise performed without a problem. Don Borowski EMC Compliance Engineer Schweitzer Engineering Labs Pullman, WA, USA From: Scott Douglas sdoug...@radiusnorth.net mailto:sdoug...@radiusnorth.net To: emc-p...@ieee.org mailto:emc-p...@ieee.org emc-p...@ieee.org mailto:emc-p...@ieee.org Date: 07/12/2013 06:46 AM Subject: EMC Required? Sent by: emc-p...@ieee.org mailto:emc-p...@ieee.org Hi folks, Consider a simple circuit. IR diode, a transistor or two, some resistors and caps. Receives input from IR remote, converts to electrical and sends down a wire. No clock in the thing so you could call is passive. But does it need EMC testing for US or EU? The IR signal will be in the 35-50 kHz range so pulses down the wire will be the same. Does this make it fit within the realm of EMC required? The device is sold by itself without other products, but is always connected to something else in use. Something else could be a wide variety of anything. I think of it like a stand-alone audio speaker. Purely a passive device that is driven by signals that fall within the EMC required realm. So do you do EMC or not? Looking forward to your opinions on this. Scott - 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 LT;emc-p...@ieee.org mailto:emc-p...@ieee.orgGT; All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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 LT;emcp...@radiusnorth.net mailto:emcp...@radiusnorth.netGT; Mike Cantwell LT;mcantw...@ieee.org mailto:mcantw...@ieee.orgGT; For policy questions, send mail to: Jim Bacher LT;j.bac...@ieee.org mailto:j.bac...@ieee.orgGT; David Heald LT;dhe...@gmail.com mailto:dhe...@gmail.comGT; - 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 mailto:emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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
