How can we check if fuses are getting near replacement age? Or would you argue scheduled replacement is the best way to manage the process?
A: IT’S possible to keep a close eye on fuse health by measuring voltages over fuse circuit connections. If your multimeter doesn’t have auto-ranging, set its controls to a voltage that you know is greater than the known voltage source in the system.
Connect the multimeter’s probes to either end of the fused circuit’s connection. What you’re looking for is either zero or very low voltage. But any sign of positive or negative source voltage – typically the full supply – means it’s time to change the burned-out fuse.
You can also test fuse resistance – you will be looking for a very low resistance – touch your probes together and be sure you see 0 ohms and hear a beep, then with the fuse disconnected from the circuit, test again looking for the same reading. If you get 0L and no beep, there’s an issue with the fuse.
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