Bala, For (b) you would need to make sure the host is still exercising the port the DUT was plugged in to (and doing so in the same manner). Otherwise you might fool yourself into thinking the problem is the DUT.
Sometimes a particular host and DUT combined are way over the limit but pass when attached to other (similar) devices. It can be tricky. Regards, Rob From: [email protected] [mailto:[email protected]] Sent: Wednesday, April 15, 2009 7:09 AM To: [email protected] Subject: Re: [PSES] SV: "Quiet" Laptop At each frequency where the emission is more than the limit or close to the limit a. Measure the emission with the DUT in full functional mode. b. Now remove the DUT (in your case the USB encryption key) and measure the emission. If emission at (a) and (b) are same then DUT is not the cause, else DUT is the cause. Can't we conclude this way. Finding a quite laptop or hub seem to be almost impossible. Bala - 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]>
