Rich Grise
Guest
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 Posted:
Sun Mar 13, 2005 3:03 am Post subject:
Re: Oscilliscope and Ground |
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On Fri, 11 Mar 2005 11:20:26 -0800, Robert Monsen wrote:
| Quote: | Larry Brasfield wrote:
"Fred Abse" <excretatauris@cerebrumconfus.it> wrote in message
On Thu, 10 Mar 2005 16:44:09 +0000, Rick Fox wrote:
A last tip - never 'float the 'scope' as you may see advised in some
places.
Who the hell "advises" this?
Rich did, and so would I for the OP. His questions
indicated that he does not yet know enough to make
sound judgments as to when that safety precaution
should be set aside and what additional precautions
to take once the o'scope is floated.
I agree that 'never' is a strong statement, and that
with appropriate caveats and precautions, floating
an o'scope can be done safely. But I would advise
the OP to walk away with 'never' for now and look
into it sometime later when he may have the need
to float his o'scope. There are usually better ways
to solve the problem anyway.
No, no, Fred was asking who the hell would tell somebody to float a
scope, not who would advise somebody not to do this.
On the other hand, I've heard about people who planned to do this.
However, oddly, I've never gotten a report back from them on how it
went... ;)
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Actually, I have "floated the scope", but in very controlled conditions,
and we (it was a whole class in tech school) followed all of the safety
rules.
It's doable, but not recommended, for all of the obvious reasons. Then
again, I've seen some pretty badly pitted 'scope ground clips! i.e., if
the scope is properly grounded, what you ground the clip to has to be
very, very close to zero potential from earth.
Cheers!
Rich
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Clarence_A
Guest
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| Posted:
Sun Mar 13, 2005 4:47 am Post subject:
Re: Oscilliscope and Ground |
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"Rich Grise" <richgrise@example.net> wrote in message
news:pan.2005.03.12.21.03.57.879053@example.net...
| Quote: | On Fri, 11 Mar 2005 11:20:26 -0800, Robert Monsen wrote:
Larry Brasfield wrote:
"Fred Abse" <excretatauris@cerebrumconfus.it> wrote in
message
On Thu, 10 Mar 2005 16:44:09 +0000, Rick Fox wrote:
A last tip - never 'float the 'scope' as you may see advised
in some
places.
Who the hell "advises" this?
Rich did, and so would I for the OP. His questions
indicated that he does not yet know enough to make
sound judgments as to when that safety precaution
should be set aside and what additional precautions
to take once the o'scope is floated.
I agree that 'never' is a strong statement, and that
with appropriate caveats and precautions, floating
an o'scope can be done safely. But I would advise
the OP to walk away with 'never' for now and look
into it sometime later when he may have the need
to float his o'scope. There are usually better ways
to solve the problem anyway.
No, no, Fred was asking who the hell would tell somebody to
float a
scope, not who would advise somebody not to do this.
On the other hand, I've heard about people who planned to do
this.
However, oddly, I've never gotten a report back from them on
how it
went... ;)
Actually, I have "floated the scope", but in very controlled
conditions,
and we (it was a whole class in tech school) followed all of the
safety
rules.
It's doable, but not recommended,
for all of the obvious reasons. Then
again, I've seen some pretty badly pitted
'scope ground clips! i.e., if the scope is
properly grounded, what you ground the clip
to has to be very, very close to zero
potential from earth.
Cheers!
Rich
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I have always used an isolation transformer for the entire test
station to avoid such problems, but even this precaution requires
care and use of save techniques. |
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