Products > Test Equipment
Multimeter CAT II Rating Discontinuation
bdunham7:
--- Quote from: Fungus on July 25, 2023, 08:47:02 am ---Let's turn it around: Is there anybody here that thinks a CAT II multimeter makes any sense?
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For general-purpose handheld meters, probably not. For bench meters I suppose the CAT II/ (300V only) makes some sense because in certain areas and situations you won't be able to get away with simply not having a CAT rating. Regulations might say that you must have an appropriate CAT rating for any measuring device connecting directly to any mains circuit. Even current clamps have CAT ratings.
I'm still waiting for someone to show me a CAT II/1000V scenario.
Fungus:
--- Quote from: tomud on July 25, 2023, 01:53:35 pm ---Seriously ? So you're saying I should throw the Keysight 34465A (CAT II 300V) and Siglent SDM3065X (CAT I 1000V, CAT II 600V) multimeters in the trash? :popcorn:
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Yep.
Or.... maybe you could follow the discussion and see we're talking about the type of meters that are used by electricians.
bdunham7:
--- Quote from: Fungus on July 25, 2023, 04:44:49 pm ---Or.... maybe you could follow the discussion and see we're talking about the type of meters that are used by electricians.
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I'm sure that's what the first thought was for many, but wouldn't the rule change in the first post apply to the CAT II bench meters as well?
OK, I guess I didn't read that carefully. I'd fully endorse removing CAT II from handheld meters intended for mains usage. My reservations about the definition of CAT II remain.
Fungus:
--- Quote from: bdunham7 on July 25, 2023, 04:54:07 pm ---
--- Quote from: Fungus on July 25, 2023, 04:44:49 pm ---Or.... maybe you could follow the discussion and see we're talking about the type of meters that are used by electricians.
--- End quote ---
I'm sure that's what the first thought was for many, but wouldn't the rule change in the first post apply to the CAT II bench meters as well?
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I think it's very unlikely that they'll ever be connected directly to mains sockets or distribution panels.
bdunham7:
--- Quote from: Fungus on July 25, 2023, 04:58:14 pm ---I think it's very unlikely that they'll ever be connected directly to mains sockets or distribution panels.
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Why not, at least for mains sockets? Someone has posted that he or his employer uses a CAT II bench meter in this way--perhaps not directly to the socket, but there's not much difference between test leads and a power cord. So if you took away that CAT II rating, some jurisdictions may have regulations that would not allow such an instrument to be connected to mains power. And the rule change appears to do just that if it applies to all multimeters, not just ones sold to electricians.
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