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6000 count DMM's (NOT a good $9 newbie meter..) Resolved.

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bitseeker:

--- Quote from: MacMeter on July 08, 2018, 01:32:06 pm ---So my question on “safely” using a BM235 fuse instead remains?

--- End quote ---

An issue with using the BM235's 400mA, 1000V fuse in lieu of the original 500mA, 250V one is the potential for user error resulting in a blown fuse. However, since the front of the meter says that it's fused for 600mA :o, I suppose it's kind of moot. Otherwise, I don't see a safety issue, per se. The BM235's HRC fuse is otherwise much better than the hollow, mystery fuse that was included.

Cliff Matthews:

--- Quote from: boffin on July 09, 2018, 02:52:57 am ---Am I the only one that doesn't give a rats ass that it's 6000 count?   I can't remember when I last had to do anything to much more than +/- 2%

--- End quote ---
I rarely work at >60v, so always having features that accompany 10mV scaling is nice. IMO we can leave the ICL710x behind..

MacMeter:

--- Quote from: bitseeker on July 09, 2018, 05:27:06 am ---
--- Quote from: MacMeter on July 08, 2018, 01:32:06 pm ---So my question on “safely” using a BM235 fuse instead remains?

--- End quote ---

An issue with using the BM235's 400mA, 1000V fuse in lieu of the original 500mA, 250V one is the potential for user error resulting in a blown fuse. However, since the front of the meter says that it's fused for 600mA :o, I suppose it's kind of moot. Otherwise, I don't see a safety issue, per se. The BM235's HRC fuse is otherwise much better than the hollow, mystery fuse that was included.

--- End quote ---

Thanks, that’s kind of what I was thinking. I installed the 400 mA fuse and using the 1 mA current test on the DMMCHECK Plus, and got a reading of only .33, that’s LOW. Just in case, today I have access to my Ragu meter, and it has the identical fuse (500 mA, 250v), put that in the meter, same LOW reading. My other meters read the correct 1 mA, so I suspect something is bad in this meter besides just the fuse, in the regards to the low current test circuit.

I could return it, but it’s only $9, and all other functions test properly. Since it can still accurately read volts, and hertz, my main use for this meter, I think rather then use the “under rated” BM235 fuse, I simply will NOT use any small fuse at all, and make a label on the meter, no one will be using this other then me, as it will be wall mounted inside a truck.

I’m assuming there is no apparent safety or functionality issues with leaving the small internal fuse holder unpopulated?

malagas_on_fire:
The alternative is on the right side of the aneng meter, which is the fluke 101 meter, but then i would require a shunt for reading currents or a clamp, as advised by joesmith.

I have one and i kind like the chipset (currently borrowed), but internally it uses small fuses as seen on wall chargers, minimal input protectiorn And joesmith is not going for the production either :P , maybe for the development ..



bitseeker:

--- Quote from: MacMeter on July 09, 2018, 03:42:45 pm ---I’m assuming there is no apparent safety or functionality issues with leaving the small internal fuse holder unpopulated?

--- End quote ---

I don't recall the exact board layout. If that fuse is only for the low-current inputs, then you just lose that current measuring functionality and the rest will continue working. However, test it to be sure what else might be affected.

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