Hi Derek - Typical requirement for a unit that may be sold and used in multiples (that is, all the units can be sold together as one product) is you can test just one IF adding the other units does not increase the emissions.
Of course the most practical way to determine that is to assemble the multiple units to see what happens. If the test result for testing max. connected units compared to testing only one unit shows no significant difference, then you're good - but definitely archive those test results! If you can't pass the test with all units connected, then whatever you do, don't let Marketing create a multiple-unit product to sell. ;-) Similarly, the desktop PC system that James mentioned would have all power cords separately tested for conducted emissions as a fully connected system (monitor, printer, scanner, etc. attached) if it is a product sold as a complete all-included system. Best regards, John McBain On Fri, Feb 17, 2023 at 1:59 PM James Pawson (U3C) < [email protected]> wrote: > Hi Derek, > > Is the daisy chain connection the AC supply or some other power bus? > > How is 8 units daisy chained any different to 8 separate units all on the > same power bus? We are looking for individual emission contributions from > each connected unit. > > If measuring conducted emissions on a desktop pc (y'know, the big ones we > had before everyone had laptops to work from home...) the you would just > measure the PC, not the monitor and printer and scanner and modem and and > and... > > Just thinking aloud > > All the best > > James > > > ---- Lfresearch wrote ---- > > Hi folks, > > > > I’ve been asked to test a light fixture that has the ability to be daisy > chained up to 8 units. > > > > When I run conducted emissions, I’m wondering if I need to insist on > having 8 units plugged in at once i.e. fully populated, OR, can I just test > one fixture at a time since that’s how the system is likely to be used > also.. > > > > Is there a legal requirement or precedent on how this should be tested as > I’m going round in circles arguing with myself here. > > > > Thanks, > > > > Derek. > > > > SSCLabs, > > Reno, NV. > > - > > ---------------------------------------------------------------- > > 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 > > > > 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: > > Mike Cantwell <[email protected]> > > > > For policy questions, send mail to: > > Jim Bacher: <[email protected]> > > David Heald: <[email protected]> > > _________________________________________________ > > To unsubscribe from the EMC-PSTC list, click the following link: > https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > > - > ---------------------------------------------------------------- > > 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 > > 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: > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher <[email protected]> > David Heald <[email protected]> > ------------------------------ > > To unsubscribe from the EMC-PSTC list, click the following link: > https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > - ---------------------------------------------------------------- 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 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: Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
