On Tuesday, April 10, 2012 09:11:46 AM kqt4a...@gmail.com did opine: > Y'all have been going on and on about scope isolation > Please elaborate > I have a project coming up that is 120vac > I prefer not to fry me or equipment > > Richard Having fried me on several occasions, I can relate that not only are the burns slow to heal, they can also trigger a 6 month bout with the shingles. I don't have an enemy I'd wish that on except one I've already outlived.
My "grounded" scope has the usual power cable equipt with the 3rd, round pin that is connected directly to earthen ground in the American way of doing things. It is a 100mhz, dual trace, partially computerized Hitachi, and IMNSHO kicks anything Tek made out of the game because after 20+ years, it is still quite well calibrated. Not too heavy, its case is a painted ALU shell that doesn't really try to hide the fact that its grounded. I have, on occasion, plugged it into one of the grey adapters to isolate it from ground, but when its probes are then connected to some non-grounded point, there is just enough capacitative leakage to effect the circuit being looked at, so its not exactly a good practice, and if one isn't careful you could easily be shocked. Badly... This little pocket digital scope OTOH, runs on a battery (no connection to the power line as long as its USB power stealing battery charging cable is not plugged in) for about 2hrs/charge, and has a plastic case, so the only places where hooking its probes 'ground' lead up to something hot, making it hot, are the mini-connector where the probe plugs into the end of it, and the not well covered end of that little clip lead on the probe. Everything else is plastic covered & probably trustable to something in excess of 500 volts, maybe even 2500 but I wouldn't want to be the tester as I'd lay it on a well insulated surface and push its buttons with a dry wooden stick while measuring something that 'hot'. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Don't look now, but there is a multi-legged creature on your shoulder. ------------------------------------------------------------------------------ Better than sec? Nothing is better than sec when it comes to monitoring Big Data applications. Try Boundary one-second resolution app monitoring today. Free. http://p.sf.net/sfu/Boundary-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
