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| Big Clive's "Trashy" meter, unboxed ( Duratool D03047 multimeter ) |
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| Fungus:
--- Quote from: Someone on April 26, 2023, 11:13:18 am ---FFS, the division between the categories has to be placed somewhere. --- End quote --- Either that or ... eliminated? Just switch everything to "CAT III", job done. |
| xrunner:
I'm brushing up on these CAT ratings because I haven't thought about it for a while, and because I think I'll try to explain them to some of the local hams who don't know what it all means (I can practically guarantee that). I get the divisions between them, but I can't find what they define as a "transient". Is there a definition for "transient" as pertains to the CAT ratings? Yes the transient is a voltage spike bit for how long? |
| joeqsmith:
--- Quote from: Someone on April 26, 2023, 07:43:45 am ---Every mains socket outlet is CAT III, ... --- End quote --- Provide a reference in any of the IEC standards from any country that states that. --- Quote from: David Aurora on April 26, 2023, 02:20:41 am ---Have you got any plans to torture test any bench meters? Unless I missed it I haven't seen any so far from you. I'd be really curious to see what you find --- End quote --- While I understand the responses about the bench meters and CAT ratings, I assume you are asking from the standpoint of how robust they are and not about safety. It's certainly a valid thought. My first Fluke was the perfect example of how not to design a robust meter. I damaged it more than once with very low level transients. When looking for something to replace it, I spoke with a friend who worked at HP. They use GDTs and other clamps on the front end to protect the sensitive circuits. I bought two different ones new and never looked back. In all the years I have owned the HP34401A, the only time it was damaged was during a lightning storm where we took a hit. I made a video of my repairs. I haven't looked at new bench meters in a long time. The few I have would have cost far more than the Gossen Ultra I looked at. I have an old Fluke 8506 that would have been over $10k new, back when it was made. You could spend $100k in a shootout. The high costs would mean turning to advertising and other funding. This isn't something I have considered. When running these benchmarks, one of the common feedbacks received was from people who saw no value in the testing and see it as a waste of money. I appreciate that they were concerned about my personal finances but you can imagine the whining when you start to burn down more than someone makes in a year in one video. :-DD |
| Black Phoenix:
Well the way I was teached some years ago regarding the CAT rankings were the following: CAT l - Electronics (<= 48V); CAT II - Single Phase outlets and connected equipments; CAT III - Three-phase distribution and connected equipments; CAT lV - Three-phase at utility connection (meter head), any outdoor conductors (buried or not). |
| IanB:
--- Quote from: David Aurora on April 26, 2023, 08:30:12 am --- --- Quote from: IanB on April 26, 2023, 04:08:37 am ---Are bench meters supposed to be robust? In my mind I think of them as sensitive, delicate, precision instruments, things to be treated with care. Would you expect an expensive Mitutoyo micrometer to survive being chucked in a tool drawer? --- End quote --- Are you talking about drop tests etc? I'm talking about surges/spikes/overload conditions/etc --- End quote --- I'm making an analogy. A sensitive mechanical instrument should be treated with mechanical care. Similarly, a sensitive electrical instrument should be treated with electrical care. |
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