# oscilloscope without wire ground

Discussion in 'Electronic Basics' started by Tobias Gadelha, Jul 28, 2013.

1. ### Tobias GadelhaGuest

Em terça-feira, 30 de julho de 2013 02h01min58s UTC-3, Phil Allison escreveu:
Phil

I'm from Brazil and here N= Neutral ; L1 =220V (-120º); L2=220V (0º) and L3(+120º) therefore L1 in oscilloscope will be GND and L2 the prove.
Is it possible with the wire groud conected in the jack?

2. ### Phil AllisonGuest

I'm from Brazil and here N= Neutral ; L1 =220V (-120º); L2=220V (0º) and
L3(+120º) therefore L1 in oscilloscope will be GND and L2 the prove.

** My god, the fool IS mucking about with 3 phase power !

Is it possible with the wire groud conected in the jack.

** Question time:

Have you got a dual trace /channel scope with "invert" function on one
channel ?

Do you have two 10:1 probes ?

If so, others have given you the answer already.

BTW:

3 phase power is VERY DANGEROUS !!!

Beginners should NOT be touching it.

.... Phil

3. ### Tom BiasiGuest

I made my point clear Phil.

You said, "Neutral conductors are always linked to ground at the service
box."

I said," In the USA neutral and ground are "usually" connected at the
service box but not always."

That's clear enough.
No need to go beyond that.

Tom

4. ### Phil AllisonGuest

"Tom Biasi"

** Clear as mud - pal.

** NO it is NOT !!!!!!!!!
** It must be connected to ground somewhere - or else it is simply NOT a
neutral.

Ever see the movie "Groundhog Day" ??

.... Phil

5. ### Tobias GadelhaGuest

Em domingo, 28 de julho de 2013 15h49min54s UTC-3, Tobias Gadelha escreveu:
ok people, resolved. thanks