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| Multimeter CAT II Rating Discontinuation |
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| bdunham7:
--- Quote from: Fungus on July 25, 2023, 06:08:02 pm ---Clue: Some meters are incorrectly labelled. --- End quote --- :wtf: Say it isn't so! |
| alm:
--- Quote from: bdunham7 on July 25, 2023, 06:31:58 pm --- --- Quote from: Fungus on July 25, 2023, 06:08:02 pm ---Clue: Some meters are incorrectly labelled. --- End quote --- :wtf: Say it isn't so! --- End quote --- What is incorrect about that? With surges as defined by CAT II 600V and CAT I 1000 V between any two inputs, the meter won't injure the user or explode. Do you have evidence that those safety claims are false? That would be a major case of fraud I wouldn't expect Fluke to commit. |
| bdunham7:
--- Quote from: alm on July 25, 2023, 07:09:37 pm ---What is incorrect about that? --- End quote --- I'm not saying it is incorrect, I'm saying it is confusing--at least to me. It's a CAT I/1000V rated meter that can't measure 1000VAC. --- Quote --- With surges as defined by CAT II 600V and CAT I 1000 V between any two inputs, the meter won't injure the user or explode. Do you have evidence that those safety claims are false? That would be a major case of fraud I wouldn't expect Fluke to commit. --- End quote --- I don't think that's a correct or complete statement of the requirements. For example, I don't believe the test procedures specify that the voltage + surge test is done on all ranges. I'm fairly confident Fluke has done their best to apply the standard correctly, but since I don't have it I can't fully understand the details. I'm certainly not claiming the markings are false. I'm not sure at all that the 'any two inputs' requirement applies to bench meters or CAT I/CAT II only devices. And IIRC, Flukes position, or at least their design standard, is not simply that the meter must not explode and injure the user. Here's another model, from the same manfacturer where it seems clearer to me. It also seems evident that the CAT ratings are not meant to apply to the 4W sense jacks. |
| tautech:
--- Quote from: bdunham7 on July 25, 2023, 08:36:39 pm --- --- Quote from: alm on July 25, 2023, 07:09:37 pm ---What is incorrect about that? --- End quote --- I'm not saying it is incorrect, I'm saying it is confusing--at least to me. It's a CAT I/1000V rated meter that can't measure 1000VAC. --- End quote --- Normal industry ratings. 1kV rated meters generally max out at 750VAC. These do: |
| Fungus:
--- Quote from: J-R on July 25, 2023, 06:17:47 pm ---Since the CAT ratings are safety ratings, it seems logical to me that you could have a device rated for CAT I 1000V but not actually be able to measure it. --- End quote --- AFAIK the voltage specified in a CAT rating is a voltage that can safely be applied on any input setting. Now we just have figure out what "safely" means - safe for the user or safe for the meter? |
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