Erik, what you say is off course all very true, but there is an adder in the grass: this is only when all wiring in the system is done according to the rules!!! And I assure you that the UPS is NOT. Oterwise these problems would not exist.
So personally I would like to blame the earth wire all the same with the rest of the incoming wires, for the moment at least. I have seen a 1 inch stub of earth wire connected within the screened off area disturb the entire works. I acted as a beautiful little aerial. So this is what motivated my choice of a biggish core and couple all the wires of the mains-lead together, and not as in a commercial mains filter have the earth wire spit off. But we will only see once the problem is resolved what the truth is going to be, as usual. Greetings j. On Mon, Oct 17, 2011 at 9:52 AM, Erik Christiansen <[email protected]>wrote: > On 17.10.11 07:41, Jan de Kruyf wrote: > > so get hold of a biggish ferrite or even better powder ring core and > > loop the mains cable through as many times as will fit. > > If the EMI is exclusively high frequency, then that'll probably work > well enough. But stuffing enough turns of the mains cable into a > humungous toroid is perhaps doing it the hard way. A 6A,120/250v > shielded common-mode balanced line filter is almost small enough to > close my fist around, bolts neatly in the equipment enclosure, and has > convenient terminals. (Unfortunately I don't know what they cost, since > my junk box supplies mine.) > > > Alternatively there might be inductive coupling between the inductor > > in the light and the transformer in the UPS. that should be curable by > > moving the UPS as far away as possible from the light. Interference > > goes down relating to the square of the distance. > > True, but the problem vanished when the mains input to the UPS was > disconnected. That pretty much excludes such inductive coupling, since > it would be unchanged by that. > > > But at this moment I am putting my bets on the copper wire. > > It's odds-on, after the last test. > > Erik > > -- > Never worry about theory as long as the machinery does what it's > supposed to do. > - Robert A. Heinlein > > > > ------------------------------------------------------------------------------ > All the data continuously generated in your IT infrastructure contains a > definitive record of customers, application performance, security > threats, fraudulent activity and more. Splunk takes this data and makes > sense of it. Business sense. IT sense. Common sense. > http://p.sf.net/sfu/splunk-d2d-oct > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2d-oct _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
