Hmmm, your inconclusive results match my experience, some up and some down. And 2 ohms per square = don't use it.
And what would that UL course be?? - Bill In the event of a national emergency, click on the following links to provide directions to your duly elected mis-representatives. http://www.usa.gov/Contact/Elected.shtml or... https://writerep.house.gov/writerep/welcome.shtml http://www.senate.gov/general/contact_information/senators_cfm.cfm if really desperate... http://www.usa.gov/Contact/Elected.shtml --- On Mon, 8/16/10, Jayasinghe, Ryan <[email protected]> wrote: From: Jayasinghe, Ryan <[email protected]> Subject: RE: [PSES] Polycarbonate Chassis To: "[email protected]" <[email protected]> Date: Monday, August 16, 2010, 7:15 PM Hi Group, Much thanks to Ken Wyatt, Peter Merguerian, Kevin Robinson, Brian O'Connell, Ron Pickard and Bill Owsley for your good advice. I have since learned that the material is High Impact Poly Styrene HIPS, I don’t have details on the shielding material other than it is 99.96 pure aluminium, Resistance is approx 2 ohms/square, Deposition is approx 150 angstroms. I performed some rudimentary radiated emission testing by cutting out a large square of the existing metal cover and attached the sample metalized material using copper tape. The results were inconclusive as I was using a NON-semi-anechoic, shielded room, some frequencies went up while others were about the same or slightly lower. I will re-test in an anechoic room. Peter’s point on the ensuring the metalized coating material does not peel and short out electrical circuitry is a point well taken as well as Kevin’s advice on avoiding this material like the plague. Ken’s comment on recycling issues was also very valuable as well as other comment on EMI/EMC. There is a UL class on this subject towards the end of the month in Brea CA which I will be sure to attend. Thank you all again, Ryan Jazz Jayasinghe Compliance Engineer x1198 Canoga Perkins Direct:(818) 678-3898 20600 Prairie Street Company:(818) 718-6300 Chatsworth, CA 91311-6008 e-mail: [email protected] www.canoga.com <http://www.canoga.com/> FAX:(818) 678-3798 ________________________________ From: Bill Owsley [mailto:[email protected]] Sent: Thursday, August 12, 2010 6:15 PM To: Jayasinghe, Ryan; Ken Wyatt Cc: [email protected] Subject: Re: [PSES] Polycarbonate Chassis A double amen to this! And cost saving be damned, we're going to have plastic no matter what! - Bill In the event of a national emergency, click on the following links to provide directions to your duly elected mis-representatives. http://www.usa.gov/Contact/Elected.shtml or... https://writerep.house.gov/writerep/welcome.shtml http://www.senate.gov/general/contact_information/senators_cfm.cfm if really desperate... http://www.usa.gov/Contact/Elected.shtml --- On Thu, 8/12/10, Ken Wyatt <[email protected]> wrote: From: Ken Wyatt <[email protected]> Subject: Re: [PSES] Po- 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 <[email protected]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]>
