Products > Test Equipment
“Blown” Fuses in Several New Multimeters
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Gyro:

--- Quote from: BeBuLamar on September 05, 2024, 10:43:15 am ---Nobody has answer for why brand new meters have blown fuse. I don't either except perhaps those are not brand new.

--- End quote ---

Nor me. I'm sure Fluke and Brymen don't ship new meters with dead fuses, so I can only put it down to 'finger trouble' sometime in their short lives.
wraper:

--- Quote from: BeBuLamar on September 05, 2024, 10:43:15 am ---Nobody has answer for why brand new meters have blown fuse. I don't either except perhaps those are not brand new.

--- End quote ---
IMHO the answer is quite clear:

--- Quote from: Locator on September 05, 2024, 06:41:35 am ---Then, just out of interest, I then opened up the brand new Fluke 179 and tested both fuses in the 179 (out of the meter). One of them was open - no continuity. (Checked with a new Fluke 87V.) What?? This was a brand new meter and the only thing I tested with it, for function was continuity, the resistance of the leads, a couple of AA alkaline batteries and the AC house current. IN the AC voltage setting - NOT in the current setting.
--- End quote ---
"brand new"
Fungus:
An AA battery is perfectly capable of blowing one of those fuses if the leads are in the wrong holes.
wraper:

--- Quote from: Fungus on September 05, 2024, 11:07:03 am ---An AA battery is perfectly capable of blowing one of those fuses if the leads are in the wrong holes.

--- End quote ---
Alkaline most likely won't be able to blow 11A fuse, but can easily blow 440mA. A few NiMH in series (much lower ESR) probably will blow 11A fuse too, a single battery likely won't be enough due to multimeter lead resistance.
Fungus:

--- Quote from: wraper on September 05, 2024, 11:13:48 am ---
--- Quote from: Fungus on September 05, 2024, 11:07:03 am ---An AA battery is perfectly capable of blowing one of those fuses if the leads are in the wrong holes.

--- End quote ---
Alkaline most likely won't be able to blow 11A fuse, but can easily blow 440mA.

--- End quote ---

I didn't say which one.  :)
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