See; CISPR 16-1 © IEC:1999+A1:2002 – 33 – 4.1.8 Screening effectiveness No problems here and our environment is EM noisy, don't leave the chamber door open... The EM noise ranges from 10's kHz to 10 GHz. Maybe it's because all our equipment is OLD. ps. avoid BNC 90's.
- Bill Indecision may or may not be the problem. --- On Tue, 12/9/08, Pettit, Ghery <[email protected]> wrote: From: Pettit, Ghery <[email protected]> Subject: RE: Mobile Phones in EMC Labs To: "Kunde, Brian" <[email protected]>, "Derek Walton" <[email protected]> Cc: "Luke Turnbull" <[email protected]>, "[email protected]" <[email protected]> Date: Tuesday, December 9, 2008, 12:50 PM Ah, for the good old days when the receiver was tuned by hand, one hand on the tuning knob, the other on the IF gain / slide back / RF attenuator. Note the level on the scope, disconnect the antenna and connect the IG, adjust the IG to match the level noted on the scope and write that number down. Apply antenna factor by hand and move to the next signal. Naw! I like automated tests. At least in an ambient free environment like a chamber. But, you should have your techs do it by hand a few times so they'll really appreciate the automation. And, did I mention that sometimes you did the old way in really "interesting" places? Like, Adak? :-) Ghery -----Original Message----- From: Kunde, Brian [mailto:[email protected]] Sent: Tuesday, December 09, 2008 9:45 AM To: Derek Walton; Pettit, Ghery Cc: Luke Turnbull; [email protected] Subject: RE: Mobile Phones in EMC Labs You bring up a good point. You must control your environment if there is any possible way changes in that environment can affect or even put into doubt your test results. We have done hours of testing then realize a customer had been playing a PSP game system in the area. Now whether it affected our test results or not, it had put our test results into doubt. So we had to perform more testing to verify our results. So, I would make it clear to customers, engineers, and even your own testers that no additional electronic devices are to be introduced into your testing environment unless it has been verified not to affect the test results. I also agree that a good and well trained test technician should be able to notice and track down any new emission source within a reasonable amount of time, but within an automated test system like ours, they tend to get a little lazy. Push a button, get a cup of coffee. Man I hate that. The Other Brian -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Derek Walton Sent: Tuesday, December 09, 2008 11:21 AM To: Pettit, Ghery Cc: Luke Turnbull; [email protected] Subject: Re: Mobile Phones in EMC Labs Hi all, just a thought.... If you're an accredited lab you are supposed to evaluate your working environment: I'd include Cell phones in this. Now, I hate banning things, so my first thought is that whoever is running testing should know about mobile Transmitters, from Door openers to cell phones. This is a topic I always discuss when Assessing. Just because things are banned doesn't mean they will not be present. In my lab I use the 4 module HP system, and Sucoflex cables. I do not see signals related to the cell phone in this system. I did when I used low cost cables. I am not advocating the used of a particular brand, just good cables. The power to the four modules is passed through a Xantrex super isolation transformer also: just cos'. Seasons greetings, Derek Walton L F Research Pettit, Ghery wrote: > > I would. Shielding of receivers isn't perfect. We have signs banning > them in our labs. Don't know how well enforced it is. J Guess I'll > have to check the next time I do a quality audit. J J > > Ghery Pettit > > ------------------------------------------------------------------------ > > *From:* [email protected] [mailto:[email protected]] *On Behalf Of > *Luke Turnbull > *Sent:* Tuesday, December 09, 2008 1:22 AM > *To:* [email protected] > *Subject:* Mobile Phones in EMC Labs > > 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 <[email protected] <mailto:[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] <mailto:[email protected]>> > Mike Cantwell <[email protected] <mailto:[email protected]>> > > For policy questions, send mail to: > Jim Bacher <[email protected] <mailto:[email protected]>> > David Heald <[email protected] <mailto:[email protected]>> > > - > ---------------------------------------------------------------- > 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] <mailto:[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] <mailto:[email protected]>> > Mike Cantwell <[email protected] <mailto:[email protected]>> > > For policy questions, send mail to: > Jim Bacher <[email protected] <mailto:[email protected]>> > David Heald <[email protected] <mailto:[email protected]>> > - ---------------------------------------------------------------- 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]> LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - ---------------------------------------------------------------- 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]> - 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]>
