Products > Test Equipment
Multimeter CAT II Rating Discontinuation
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Fungus:

--- Quote from: bdunham7 on July 24, 2023, 01:32:53 pm ---Can you cite a single example of a non-bullshit DMM that has a CAT II/300V rating?  (by "non-bullshit" I mean one where the rating is not just printed on the front as a sad joke)

And a related question (one that supports eliminating CAT II...) can you think of a single example of a circuit that would be CAT II/1000V (Category 2 and in excess of 600V) ?

--- End quote ---

You're asking me?
bdunham7:

--- Quote from: Fungus on July 24, 2023, 01:43:34 pm ---You're asking me?

--- End quote ---

Sure, but anyone can chime in.
mendip_discovery:

--- Quote from: Fungus on July 24, 2023, 01:26:11 pm ---
--- Quote from: Someone on July 24, 2023, 09:31:23 am ---Says the person who didn't understand the delineation and was adding further confusion to people trying to understand it

--- End quote ---

Please tell us all if this outlet is CAT II or cat III:


What class multimeter should I use on it?

--- End quote ---

To me it just looks like a child's first attempt at designing a plug and socket.

Dr. Frank:

--- Quote from: bdunham7 on July 24, 2023, 01:32:53 pm ---
Can you cite a single example of a non-bullshit DMM that has a CAT II/300V rating?  (by "non-bullshit" I mean one where the rating is not just printed on the front as a sad joke)


--- End quote ---

Well, I just inspected my 34465A from KS, 2015, which is rated on its front panel: CAT II (300V)
Though, it is able and allowed to measure 1000V DC... I have to check, if this is a contradiction.

Anyhow, it is custom in Standardization that a new release of a standard is valid for new products / new development only, but not retroactive.
I.e. these DMMs or other instruments should be still 'legal' and shall not be updated somehow.

Frank

PS: I copy the Regulatory of the 2015 datasheet, which might explain this supposed contradiction of CAT II / 300V vs. 1000V DC.
CAT classification to my understanding now relates strictly to measuring Mains voltages.
mendip_discovery:
FYI, Fluke's ABCs of multimeter safety
https://res.cloudinary.com/iwh/image/upload/q_auto,g_center/assets/3/7/ABC-meter-safety.PDF


--- Quote ---The division of a power distribution system into categories is based on the fact that a dangerous high-energy transient such as a lightning strike will be attenuated or dampened as it travels through the impedance (ac resistance) of the system. A higher CAT number refers to an electrical environment with higher power available and higher energy transients. Thus a multimeter designed to a CAT III standard is resistant to much higher energy transients than one designed to CAT II standards.
--- End quote ---

The above statement makes me think that this move to remove more CAT2 stuff is because electricians etc are increasingly at risk of being near a higher power than may initially be expected. With more 3-phase stuff going near car chargers being one thing.
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