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EEVblog #84

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Blowing multimeters, you make my day !

I also like the new music at the beginning and at the end

(Yes, I am monitoring your video folder  ::))

Sorry again for my bad english

Yeah, that was fun. Shame Doug only had the baby 400J unit, we were hoping to see a meter catch on fire. But we did get one to fully explode which was pretty cool.
Next video is a quick explaination from Doug about building a high voltage probe.


Cool, I will build my own one so I could blow my old multimeter as soon as I get my new one

Would have been interesting too try the Smart Tweezers at 400J especially since this is really a “hand held” instrument!
Any volunteers, I mean someone holding it during the test?  ;)

This is probably vaguely similar to the CAT I 1000V test (4kV, 20 repetitions, 30 ohms source impedance), although the source impedance and duty cycle might be different. So the bottom line is that you shouldn't use any of the meters that exploded violently (which probably includes the early Fluke 70-series, depending on the velocity of that range switch) for mains or CAT I high-voltage (eg. flyback transformer) use. I'd still consider them safe enough for low-voltage work behind a power supply (eg. wall wart / transformer / battery / lab supply). I tend to touch that stuff with my bare hands, and use uninsulated tools with some random 5V arduino circuit, so I don't see a DMM without input protection as a an extra risk.

Disclaimer: I actually don't own any of those cheap DMM's, although I do own some older name-brand meters which don't have CAT ratings.


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