Ken, wouldn't the level at the output of the 3dB filter be about 1dB greater than the 6dB filter, if signal is broadband compared the BW? Isn't energy related to sqrt of BW. _______________________________________ _____________________________________________
Ralph McDiarmid | Schneider Electric | Renewable Energies Business | CANADA | Compliance Engineer From: Ken Javor <[email protected]> To: [email protected] List-Post: [email protected] List-Post: [email protected] List-Post: [email protected] Date: 06/17/2010 05:22 PM Subject: Re: [PSES] Spectrum analyzers for MIL-STD-461 CE101? ________________________________ If memory serves, the difference between opt 462 IBW and 3 dB BW was a factor of 1.5. Meaning that the IBW rating of a filter originally spec'd at 3 dB points was 1.5 times the 3 dB BW. Now if you can get one of the forum members to apply an impulse generator to an EMI receiver with 6 dB BW spec'd, then you will have all the info you need to know. Ken Javor Phone: (256) 650-5261 > From: Ken Javor <[email protected]> > Date: Thu, 17 Jun 2010 19:15:48 -0500 > To: Untitled <[email protected]> > Conversation: Spectrum analyzers for MIL-STD-461 CE101? > Subject: Re: Spectrum analyzers for MIL-STD-461 CE101? > > There are all sorts of spectrum analyzers and receivers out there with > coverage to 30 Hz. Agilent and R&S readily come to mind. The HP 8566 Opt 462 > was impulse BWs, not 6 dB. > > The difference between 3 dB and 6 dB BW will only affect BB signals, like > rectification harmonics. If you know the shape factor of the 3 dB filter > (Gaussian for the 8566) vs. the 6 dB filter, you can calculate how much extra > signal the 3 dB BW machine would report over a 6 dB BW machine. > > Ken Javor > > Phone: (256) 650-5261 > > >> From: "[email protected]" <[email protected]> >> Date: Thu, 17 Jun 2010 16:58:19 -0700 >> To: <[email protected]> >> Subject: Spectrum analyzers for MIL-STD-461 CE101? >> >> Hi, >> >> I need to rent a spectrum analyzer for performing MIL-STD-461 CE101 tests. >> Although the requirements go down to 30Hz, I only need to start at 100Hz. >> >> After sifting out analyzers with frequency range limits, and those with >> -3dB IF bandwidth specifications, I keep coming back to the venerable HP >> 8566B or 8568A with option 462 (bandwidths spec'd at -6dB). >> >> 1) For those who perform this test, what spectrum analyzers do you use? >> 2) How much different will readings be if I used equipment with -3dB IF >> bandwidth specs? >> >> TIA, >> Pat Lawler >> EMC Engineer >> SL Power Electronics Corp. >> >> - >> ---------------------------------------------------------------- >> This message is from the IEEE Product Safety Engineering Society emc-pstc >> discussion list. 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Website: http://www.ieee-pses.org/ <http://www.ieee-pses.org/> Instructions: http://listserv.ieee.org/request/user-guide.html <http://listserv.ieee.org/request/user-guide.html> List rules: http://www.ieee-pses.org/listrules.html <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 email has been scanned for SPAM content and Viruses by the MessageLabs Email Security System. ________________________________________________________________________ - 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]>
