Products > Test Equipment

Multimeter fuses

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joeqsmith:
I would not mind getting my hands on various fake fuses to play with.  If you have a known source on Amazon that will sell them, post it or PM me.   

John Ward had ran some tests on some fakes.  It make be interesting to try and run some similar tests on the large HRC fuses used in the meters.   


Fungus:

--- Quote from: joeqsmith on July 10, 2016, 06:04:43 pm ---I would not mind getting my hands on various fake fuses to play with.  If you have a known source on Amazon that will sell them, post it or PM me.   

--- End quote ---

There's loads on eBay. Don't know about Amazon though.


--- Quote from: joeqsmith on July 10, 2016, 06:04:43 pm ---John Ward had ran some tests on some fakes.

--- End quote ---

They weren't much worse then the 'real' ones.

OK, some smoke came out of one of them :D but the times, breaking currents and maximum temperatures weren't that different. Not enough to be the difference between life/death.

Berni:
A glass fuse will work here just fine.

What i want to see tested is interrupting large fault currents. That's where a glass fuse dangerously explodes while a proper HRC fuse should contain it and stop the arc safely.

I do have a sizable capacitor bank(i think about 800 Jules at 450V) that could provide enough power to explode fuses, but these fuses tend to be a bit expensive to blow up a dozen of them.

Richard Head:
The silica sand in HRC fuses is used to displace the air. If the air (gas) is removed there is no significant pressure build-up inside the fuse and it doesn't explode.

joeqsmith:
I was hoping that with as many fake DMM HRC fuses there were on Amazon, I would get some leads from those of you that bought them.   The only ones I saw where people had made them were the smaller sizes like John shows.   

Assuming they could be found for a fair price, would have been fun to get 5/ea of various ones and bench mark them.  Maybe a tear down, 2 at DC and two at their fault currents (using a scope to capture what is going on).   Drag out the faster camera.

One of the glass ones in the VICI 99:
https://youtu.be/Q23eArAsXmo?t=1845

Small glass and ceramic fuses on the half cycle simulator:
https://youtu.be/cWKoRxNEsXk?t=90


Of course, photonicinduction does a much better job using some much higher rupture current fuses:
https://youtu.be/0-HYPdh744M?t=342




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