At 04:54 PM 9/1/99 -0300, Muriel Bittencourt de Liz wrote: > >Dear Members > >I'd like to solve a doubt.. suppose the following: > >"I have an electrical installation in a house. The feeding is with >three-phase and one neutral conductors. If I connect a TV and a blender >in the same phase, the blender generates interference (lines) in the TV >screen. If I connect the TV in one phase, and the blender in another, >the TV will have interference??? The neutral conductor is the same for >all (of course!)" > >Seems very plain, but I'd like to know... :)
As I read the responses, I realized I was assuming a cable TV hookup. That may not be the case. I was involved with a product that used a 1 1/2 HP router motor as part of it's workings. You could see the sparking of the brushes when it operated. But, I was surprised to see very little interference up in the radiated range for FCC. What does impress me is that this interference may have something to do with the frame rate of the TV, since the NTSC is based on the 60 Hz and PAL is based on the 50 Hz line frequencies. In that sense, my guess is that it's most likely conducted interference. And I'd suspect you'd get interference even plugged in another phase. One simple test would be to put the blender in the oven with the oven door shut and turn it on. The blender, NOT the oven. <grin > If you get almost the same interference, then it's conducted. Doug --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
