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| Multimeter fuses |
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| Fungus:
--- Quote from: DenzilPenberthy on July 08, 2016, 01:10:45 pm ---I'd say they are exactly like aircraft parts in that they are a safety component which if it does not perform as expected then someone will very likely be maimed or killed. Put a normal 32mm glass fuse in a multimeter, set it to Amps range then put the probes across two phases of a large 3 phase busbar and see what happens! --- End quote --- The concept is the same, yes. --- Quote from: DenzilPenberthy on July 08, 2016, 01:10:45 pm ---They are expensive for all of the same reasons that an aircraft bolt is more expensive --- End quote --- Not really. Aircraft bolts are expensive because of the supply logistics and the paper trail they leave behind behind them. These fuses don't have that. |
| markce:
Funny things thse fuses. I've a large number of fuses installed in all kind of equipment, test and consumer. They never blow, so why worry. I once blew the 440mA fuse in my Fluke DMM when it was very new. It's expensive, but part of my personal safety using this meter, so I accept a higher price. The price itself makes me think twice when using current settings, thus increasing safety... |
| David Hess:
I have blown these fuses in the past and when I needed an immediate replacement, I soldered 3 strands from 7/32 stranded 24 gauge wire across the fuse caps to make a 20 amp fusible link. I wonder if the fuse construction is more than embedding the fuse element inside of sand. Could the granular material decompose when heated by the arc outgassing to extinguish it? |
| retiredcaps:
--- Quote from: David Hess on July 09, 2016, 09:16:28 pm ---I wonder if the fuse construction is more than embedding the fuse element inside of sand. --- End quote --- Modemhead took apart a Bussmann fuse after an oops moment. http://mrmodemhead.com/blog/inside-a-multimeter-fuse/ |
| Fungus:
--- Quote from: David Hess on July 09, 2016, 09:16:28 pm ---I wonder if the fuse construction is more than embedding the fuse element inside of sand. --- End quote --- Nope. --- Quote from: David Hess on July 09, 2016, 09:16:28 pm ---Could the granular material decompose when heated by the arc outgassing to extinguish it? --- End quote --- Nah, there won't be enough heat from the fuse wire to turn the sand to plasma. The air around the fuse is probably more conductive once the fuse vapor has dispersed into the sand . --- Quote from: markce on July 09, 2016, 08:56:53 pm ---The price itself makes me think twice when using current settings, thus increasing safety... --- End quote --- Yep. It certainly teaches you how to use a multimeter safely. |
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