Whenever you use an LISN, you should always characterize the port loss. At the lowest frequency end of your measurement range, it will not be surprising to find a several dB correction factor is needed to be added to your data to compensate for response roll-off. And if you use two similar LISN's, characterize each one for its unique port loss curve.
As others have posted, you can't interchangeably use either a current probe or an LISN. (Remember that the LISN imposes a new impedance in series with the powerline, while the current probe is relatively non-intrusive.) Look back to the compliance document to tell you which method to use. Ed Price WB6WSN Chula Vista, CA USA From: McDiarmid, Ralph [mailto:[email protected]] Sent: Monday, September 16, 2013 1:52 PM To: [email protected] Subject: Re: [PSES] question - emission measurements below 150kHz Dear EMC-PSTC forum members, Given a need to measure conducted emissions from 150kHz down to 9kHz, would it be better to: 1. characterise 50ohm LISN for insertion loss down to 9kHz 2. use a current clamp rated for that frequency and use transfer impedance to determine dB(uV) I can see that impedance of 50ohm/50uH LISN could be an issue at frequencies < 100kHz approx. thanks, ____________________________________________________________________________ ___ Ralph McDiarmid | Schneider Electric | Solar Business | CANADA | Regulatory Compliance Engineering - ---------------------------------------------------------------- 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.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://www.ieee-pses.org/list.html (including how to unsubscribe) <http://www.ieee-pses.org/list.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.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://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
