T
Tobias Gadelha
- Jan 1, 1970
- 0
Is there any risk to use oscilloscope without wire ground? Because with wire ground there is a short circuit when I use GND on the line.
You shouldn't be touching your ground to line voltage.Is there any risk to use oscilloscope without wire ground? Because with wire ground there is a short circuit when I use GND on the line.
You shouldn't be touching your ground to line voltage.
Em domingo, 28 de julho de 2013 16h16min59s UTC-3, Tom Biasi escreveu:
but I need measure line (L1) with reference in line(L2).
but I need measure line (L1) with reference in line(L2).
What makes you sure about that?"Tobias Gadelha"
** L1 or L2 will be at the almost same potential as ground - so you have no
real problem.
Is there any risk to use oscilloscope without wire ground? Because with wire ground there is a short circuit when I use GND on the line.
I'm just learning this stuff myself, but I have a question about your
question... Are you talking about the ground in the plug, or the ground
for the probe? It would surprise me greatly if they were connected. I
would *think* that you could connect the probe's GND to a line with any
potential.
I would expect only the relative potential to where the other part of
the oscilloscope is connected need to be within range for the scope, but
not with reference to the earth.
I could very will be extremely wrong about all this, but and would love
to be corrected before I end up passing high voltage through my body ;-)
Thanks,
Daniel.
Is there any risk to use oscilloscope without wire ground? Because with
wire ground there is a short circuit when I use GND on the line.
Phil said:"Tobias Gadelha"
What makes you sure about that?
How are you sure that "L1 or L2 will be at the almost same potential as"Daniel Pitts"
** About what exactly ?
My only point was that I wasn't sure, and wondered what your reasoningMake your point or piss off.
I see... That makes sense, but is still surprising to me. So it seemsLook here: http://www.allaboutcircuits.com/worksheets/scope1.html
See number 11.
Phil said:How are you sure that "L1 or L2 will be at the almost same potential as
ground" is true? I don't understand how you came to that conclusion so I
was curious how you did.
In the USA neutral and ground are "usually" connected at the service box"Daniel Pitts"
** The codes L1 and L2 are very often seen on schematics refering to the
active and neutral conductors.
( Nothing suggested the OP was dealing with 3 phase power and I hope to
hell he is not)
Neutral conductors are always linked to ground at the service box.
So, the voltage seen from active to ground is almost the same as that from
to active to neutral - the only difference being due to current in the
particular neutral wire due to some load.
Get your DMM out and check it sometime.
... Phil
I was not aware of that convention. Thanks."Daniel Pitts"
** The codes L1 and L2 are very often seen on schematics refering to the
active and neutral conductors.
In the USA neutral and ground are "usually" connected at the service box
but not always.
L1 and L2 are usually hot wires wrt ground.
Confusion with terminology is dangerous.
This is a basic group.
I see... That makes sense, but is still surprising to me. So it seems
likely depending on the OPs application, coupling transformers may be a
safer way to handle this situation. Thanks for the lesson ;-)
Neutral and ground are not always the same."Tom Biasi"
** It must be connected to ground somewhere - or else it is simply NOT a
neutral.
** Only IF you are speaking about two phase AC supply wiring in the USA.
AFAIK - something only used for large appliances like stoves and water
heaters.
Not electronics.
** You are a very basic person.
Neutral and ground are not always the same.
"Tom Biasi"
** Of course they are not the SAME !!!!!!!
Neutrals ARE current carrying conductors.
Safety grounds are NOT, until a fault condition arises.
Make your point clear.
... Phil