When doing this, you need a good power supply with a choke on it and a good Ethernet cable, one that is shielded costs more money than your typical cable. I have no idea what your cape is doing, Having it in a case can help, but the real issues are related to the cables that come into and out of the enclosure.
Gerald On Mon, Jul 25, 2016 at 7:03 AM, David Accadia <david.acca...@gmail.com> wrote: > > We are planning to use the Beagle Bone black in a commercial product, We > have designed a custom cape and put the whole thing inside an aluminum > housing. The system has been sent off for EMC testing but unfortunately > the testing lab has failed conducted emission. There where a lot of peeks > but the following frequencies failed > > > 180MHz > 203MHz > 228MHz > 250MHz > 288MHz > 312MHz > 372MHz > 384MHz > 396MHz > 420Mhz > 468MHz > 480MHz > 875MHz > 1000MHz > > To try and isolate the issues we've acquired a spectrum analyzer and a > set of near field probes. From my testing with the near field probes It > seems that most of the failed frequencies are coming from the beagle bone > black. > > I've noticed the 1000MHz and 250MHz peeks (which where the biggest) seemed > to go when the Ethernet cable was is removed. Many of the other peeks > seemed to match up with the peeks on the beagle bone black FCC report. ( > http://elinux.org/Beagleboard:BeagleBoneBlack#Regulatory_Compliance_Documents) > The once that don't also seem to go when the beagle bone is powered off. > The system sits inside an extruded aluminum housing and the end plates are > actually PCBs with single plane of copper. So there is lot I can still do > to tighten up the enclosure. Although based on the report I would have > expected the BBB to pass outside an enclosure. > > > Has any one else had similar experience with the beagle bone black and > EMC problems? And how did you solve them? > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to beagleboard+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/5a62f4ad-5745-4814-8f2c-08ad0a665d71%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/5a62f4ad-5745-4814-8f2c-08ad0a665d71%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- Gerald ger...@beagleboard.org http://beagleboard.org/ gcol...@emprodesign.com -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAHK_S%2BfRo2F5x_ifPaJ8eTPbn8OYCpS2nGxOeJhRoRYLsCjftA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
