Products > Test Equipment
Multimeter CAT II Rating Discontinuation
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Someone:

--- Quote from: Fungus on July 28, 2023, 01:34:28 pm ---And to make it blindingly obvious why we don't bow down to that, 61010 also mentions source impedance:


I don't agree that source impedance is exactly 2 ohms at the back of all sockets and I don't agree that it changes by exactly 10 ohms across the socket.
--- End quote ---
Because nowhere does the standard say that. You keep forcibly injecting your repeatedly failed argument over and over and over, when it's purely your imagination. The source impedances of the standard are for the test setup, which with their over voltage (which scales across the Measurement Categories) ends up being representative of something close to worst case in the real world. Nowhere does it say that is what installations are/do/shall be only that the standard believes this is representative of worst cases within those categories.
joeqsmith:
Both the general as well as the surge standards talk about the source impedance.   The UL standard mentioned states 2,12 & 30 for the impulse generator's source impedance depending on the category. 


Someone:

--- Quote from: joeqsmith on July 29, 2023, 02:57:05 am ---Both the general as well as the surge standards talk about the source impedance.   The UL standard mentioned states 2,12 & 30 for the impulse generator's source impedance depending on the category.

--- End quote ---
I would be interested in hearing more about the US (and German from the other thread) local practices/standards for delineating/labelling/recognising different hazard groups/categories. Here in Australia the Measurement Categories have been adopted directly:
https://www.worksafe.qld.gov.au/news-and-events/newsletters/esafe-newsletters/esafe-editions/esafe-electrical/2022-newsletters/june-2022/multimeter-incidents
Fungus:

--- Quote from: Someone on July 28, 2023, 10:27:30 pm ---The standard is not wrong, it does not say either side of a socket outlet is magically radically different electrical characteristics.

--- End quote ---

Huh? You yourself said: "As mentioned in the other thread(s), its very very simple: something that plugs into a socket outlet is immediately CAT II"


--- Quote from: Someone on July 28, 2023, 10:27:30 pm ---Do you go to the zoo and step over the fence to demonstrate there are (almost) never tigers behind the first layer? Your choice. Are there never tigers in the public walkways? less often but non-zero.

--- End quote ---

That analogy would work perfectly if all sockets had a built-in 10 Ohm resistor as a "fence".

But they don't.
Someone:

--- Quote from: Fungus on July 29, 2023, 05:00:48 am ---
--- Quote from: Someone on July 28, 2023, 10:27:30 pm ---The standard is not wrong, it does not say either side of a socket outlet is magically radically different electrical characteristics.
--- End quote ---
Huh? You yourself said: "As mentioned in the other thread(s), its very very simple: something that plugs into a socket outlet is immediately CAT II"


--- Quote from: Someone on July 28, 2023, 10:27:30 pm ---Do you go to the zoo and step over the fence to demonstrate there are (almost) never tigers behind the first layer? Your choice. Are there never tigers in the public walkways? less often but non-zero.

--- End quote ---
That analogy would work perfectly if all sockets had a built-in 10 Ohm resistor as a "fence".

But they don't.
--- End quote ---
and no one says that they do, except your imaginary strawman argument.
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