Electronics > Beginners
Differential measurements using isolated oscilloscope
tggzzz:
--- Quote from: not1xor1 on December 14, 2019, 04:31:05 pm ---
--- 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
--- End quote ---
... and it is always worth being aware of the possibility of FOAF urban legends :)
not1xor1:
--- Quote from: tggzzz on December 14, 2019, 04:42:13 pm ---
--- Quote from: not1xor1 on December 14, 2019, 04:31:05 pm ---
--- 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
--- End quote ---
... and it is always worth being aware of the possibility of FOAF urban legends :)
--- End quote ---
The main problem is that old scopes had a metal case and it was much easier to touch a ground connected part.
Modern scopes (at least the cheap ones I know :) ) have very few, easily touchable, ground exposed parts, in most cases just the BNC connectors.
Although not as safe as a good multimeter, they are much safer than the old scopes.
In any case, even with the right equipment, multimeter or isolated probes, you must be careful when dealing with dangerous voltages. No specialized equipment can protect you from some stupid mistakes.
magic:
--- Quote from: tggzzz on December 14, 2019, 10:13:53 am ---People that advocate floating a scope don't understand, can't recognise and hence can't avoid the risk.
--- End quote ---
As always, you are welcome to speak for yourself :-DD
Thousands of people survive this horrible experience. I'm not even sure if the accident ratio per hour flown isn't lower than in amateur aviation :P
tggzzz:
--- Quote from: not1xor1 on December 17, 2019, 05:56:44 am ---In any case, even with the right equipment, multimeter or isolated probes, you must be careful when dealing with dangerous voltages. No specialized equipment can protect you from some stupid mistakes.
--- End quote ---
Yes, absolutely true.
It isn't even necessary to invoke stupid mistakes. We all make mistakes.
tggzzz:
--- Quote from: magic on December 17, 2019, 08:23:40 am ---
--- Quote from: tggzzz on December 14, 2019, 10:13:53 am ---People that advocate floating a scope don't understand, can't recognise and hence can't avoid the risk.
--- End quote ---
As always, you are welcome to speak for yourself :-DD
Thousands of people survive this horrible experience. I'm not even sure if the accident ratio per hour flown isn't lower than in amateur aviation :P
--- End quote ---
I'm speaking of people that exhibit the Dunning-Kruger syndrome. We know who they are but, by definition, they don't.
Thousands of people survive walking out into road traffic without looking; more so nowadays. By your "reasoning" we shouldn't point out that it is dangerous.
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