Products > Test Equipment
Fluke 179 keeps blowing fues
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Fungus:

--- Quote from: Gyro on May 19, 2024, 08:00:56 pm ---
--- Quote from: Fungus on May 19, 2024, 07:50:43 pm ---1.9 is less than 12

--- End quote ---

That's helpful, did you work that out for yourself?  What do you think the mA shunt resistor value is on a Fluke 179? My guess is 10R.

--- End quote ---

No need to guess, you can work it out from the spec.

(nb. The spec will include the fuse ... which measured 1.9 Ohms)


bdunham7:

--- Quote from: Paul LGF on May 19, 2024, 07:07:22 pm ---Just thought that 1.9 Ohms was a bit to close to short for comfort

--- End quote ---

I don't know where you see the "<12 ohms" in the manual, but I just tested a genuine Bussmann DMB-44/100 and it had a resistance of 0.733 ohms, which is pretty close to what I'd expect.  The overall resistance of the meter in this range should be under 2 ohms AFAIK (I don't have a 179 on hand) and "being close to a short" is irrelevant--lower is better.  The part of your question that has everyone puzzled is the notion that the meter is somehow at fault.  There is no possible malfunction of the meter that would result in blowing that fuse inappropriately. 
Gyro:
Page 14 of the 175/177/179 Users Manual (May 2003, Rev 3,4/23 from the Fluke site), "Test the Fuses". The procedure assumes fuse and shunt in series.

(Don't ask me why it's so high)
bdunham7:

--- Quote from: Gyro on May 19, 2024, 09:30:27 pm ---Page 14 of the 175/177/179 Users Manual (May 2003, Rev 3,4/23 from the Fluke site), "Test the Fuses". The procedure assumes fuse and shunt in series.

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Hmm.  Maybe a typo?  To get the specified burden of <2mV/mA, the actual value should be less than 2 ohms and I don't see why there would be a signficant deviation measuring it that way unless they're adding in up to 10 ohm for crappy test leads.  In any case, 1.9 is less than either 12 or 2.
Gyro:

--- Quote from: bdunham7 on May 19, 2024, 09:40:21 pm ---Hmm.  Maybe a typo? ...

--- End quote ---

Beats me. 1.2R would be too low for the 2R shunt. 2R would still be too low if you include fuse and lead resistance.
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