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DMM safety

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Fungus:

--- Quote from: Traceless on December 02, 2022, 08:21:37 am ---The reason I'm asking my original question is that I'm currently looking at a meter that noone, including Joe has tested yet. The Brymen BM089 which according to its datasheet complies with:

UL/IEC/EN61010-1 Ed. 3.0, IEC/EN61010-2-033 Ed. 1.0, CAN/CSA C22.2 No. 61010-1 Ed. 3.0, IEC/EN61010-2-032 Ed. 3.0 & IEC/EN61010-031 Ed. 1.1:Measurement Category III 1000V & Category IV 600V AC & DC.

--- End quote ---

If Bryman says that in the user manual then it's a safe bet that it met those standards.


--- Quote from: Traceless on December 02, 2022, 08:21:37 am ---So the question is basically does any of the aforementioned safety-standards imply that they actually tested the meter with all three leads connected to mains and put it in the µA range and it didn't blow up?

--- End quote ---

Yes.

Fungus:

--- Quote from: Traceless on December 02, 2022, 08:21:37 am ---If you look at the specs more closely though, they say that the DC µA range of that meter has a burden voltage of 3.5mV/µA aka. 3.5kV/A which is pretty high. Still DC µA will create a short across the mains and there is a lot of energy involved...

--- End quote ---

The uA range is for measuring flame sensors so it will have a very limited range, hence the high burden voltage.

(and also the safety rating - the internal resistance in uA mode is nowhere near zero so only a low current will pass).

BeBuLamar:
Thanks! I didn't know but when I called Fluke and told them they said it's underwarranty. Just have to send the old one for them to destroy they send me a new one.

tautech:

--- Quote from: Fungus on December 02, 2022, 02:46:00 pm ---
--- Quote from: Traceless on December 02, 2022, 08:21:37 am ---If you look at the specs more closely though, they say that the DC µA range of that meter has a burden voltage of 3.5mV/µA aka. 3.5kV/A which is pretty high. Still DC µA will create a short across the mains and there is a lot of energy involved...

--- End quote ---

The uA range is for measuring flame sensors so it will have a very limited range, hence the high burden voltage.

(and also the safety rating - the internal resistance in uA mode is nowhere near zero so only a low current will pass).

--- End quote ---
:-//
Maybe you have never built and needed to measure the quiescent draw of a micro power device.

Fungus:

--- Quote from: tautech on December 02, 2022, 05:51:20 pm ---Maybe you have never built and needed to measure the quiescent draw of a micro power device.

--- End quote ---

I've built a lot of coin cell powered devices that lasted for years.

OTOH I wouldn't want "flame sensor test" to be the only uA range on my multimeter, and I certainly wouldn't want that huge burden voltage.

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