Electronics > Beginners
Differential measurements using isolated oscilloscope
tggzzz:
--- Quote from: not1xor1 on December 14, 2019, 05:45:40 am ---
--- Quote from: tggzzz on December 12, 2019, 10:35:38 pm ---Sigh.
The OP, who is also new to this forum, would be well advised to read, learn, and inwardly digest this: https://www.eevblog.com/forum/projects/isolation-transformer-for-scope/msg2259465/#msg2259465 Especially the anecdote including "This guy was WELL AWARE of the danger and took a lot of precautions to prevent shock . . . Bottom Line: He died anyway."
--- End quote ---
I agree about the dangers of high voltage, but I want to stress that a random quote from a post forum has absolutely no value as a proof.... that smells so much of urban legend...
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If you read the reference, that anecdote was written by the engineer that investigated the incident as part of his professional duties. It is much more credible than urban legend.
Yes, of course it is an anecdote - but one that is a concrete example of sound proven theory and practice. It is much more credible than urban legend.
It is worth repeating anecdotes, because some people - particularly those that distrust "theory" and "experts" - tend to place more reliance on personal stories than impersonal theory. Strange, but true, and worth understanding.
And I would still be interested to hear if "GeorgeOfTheJungle" has watched anybody die in an avoidable accident. Somehow I doubt it :)
magic:
I have almost been killed myself in an avoidable accident and still don't see it as a reason to become a cowardly wimp :-DD
The best way to avoid high voltage accidents is to become a web developer :P Hate to say it, but once you open the cover of some mains powered appliance you already need to be careful around it, not matter how you probe it.
Aners:
Guys, I really appretiate the warning about floating my oscilloscope but I was not planning on doing it and also I would rather this thread contain information about the question I asked. Even if it does not specifically state a by-design isolated oscilloscope I did post which types of scopes I meant in the reply I made. I still have some followup questions, I just need to write them down.
I just bet there are many many threads already about how dangerous it is to float a scope and another one is not needed.
tggzzz:
--- Quote from: magic on December 14, 2019, 08:56:13 am ---I have almost been killed myself in an avoidable accident and still don't see it as a reason to become a cowardly wimp :-DD
--- End quote ---
That's a stupid non-sequiteur.
I don't avoid risks and have deliberately placed my daughter in risky situations, e.g. backpacking around India when 13yo, climbing and skiing, and being a solo pilot in aircraft that have to make forced landings (before she could start to drive a car in her case).
The point is to learn to understand what's risky, how to recognise incipient risks, and how to deal with them when they occur.
People that advocate floating a scope don't understand, can't recognise and hence can't avoid the risk.
I really don't care if such people injure themselves. I do care if they ignorantly teach bad pactices to other people.
--- Quote ---The best way to avoid high voltage accidents is to become a web developer :P Hate to say it, but once you open the cover of some mains powered appliance you already need to be careful around it, not matter how you probe it.
--- End quote ---
True but trite and unhelpful.
Maybe you think statements such as "do not be on fire" are useful? Yes, I've seen/heard that statement too often - usually by people embracing the Dunning-Kruger syndrome.
not1xor1:
--- Quote from: tggzzz on December 14, 2019, 08:44:53 am ---
--- Quote from: not1xor1 on December 14, 2019, 05:45:40 am ---I agree about the dangers of high voltage, but I want to stress that a random quote from a post forum has absolutely no value as a proof.... that smells so much of urban legend...
--- End quote ---
If you read the reference, that anecdote was written by the engineer that investigated the incident as part of his professional duties. It is much more credible than urban legend.
--- End quote ---
OK... I had missed that... you're right... in that case that's a reliable source
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