The multimeters we use have a 250mA fuses, which often gets blown if the students have set the meter up on the wrong setting and the current is too high. For 14 years I've been dismantling meters to check whether a blown fuse is responsible for an experiment not working properly, but now I have the solution!
- take 2 multimeters - one set to ohms and the other, which you want to test, set to mA
- Connect the ohm meter across the mA meter
- If the ohm meter reads 1, then the fuse is blown and you still have to dismantle the meter to change it
- If the ohm meter reads 0 (or thereabouts) then the fuse is fine.
The meter on the left is set to ohms and is testing the one on the right. This multimeter is fine.
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