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How to measure FUSEAND CONTINUITY
A digitalmultimeter is the ideal multimeter t use to check fuses.
You can test afuse using either a digital volt-ohmmeter or an analog volt-ohmmeter. Thedigital multimeter uses a LCD to indicate the condition of the fuse under testwhile an analog meter uses a traditional meter movement to indicate the fusecondition.
Things You'll Need
- Digital multimeter or analog multimeter
Usinga digital multimeter
Connectthe test leads to the volt-ohmmeter. Plug the black test leads into the blackjack marked "Com" or "Common" on the front of the meter.Plug the red test lead into the red jack marked "Volts/Ohms" on thefront of the meter.
Setthe meter's function switch to "Ohms" and the range switch to the"R x 1" scale. If your digital multimeter is an auto ranging meter,you will not have a range switch. Instead, you'll have just a function switchbecause the meter will automatically select the right range for the quantitythat you are measuring.
Turnoff the power and remove the fuse to be tested from the circuit. Never test afuse for continuity while it is still connected to the circuit that it is usedto protect. If the circuit still has voltage, the meter will be irreparablydamaged. If the fuse is still in the circuit when tested it is possible to geta false indication that the fuse is good if the meter gets a completed circuitthrough other circuit components. To be safe, always remove the fuse from thecircuit before testing it.
Touchthe black test probe to one end of the fuse and the red test probe to the otherend of the fuse. It does not matter which probe you touch to which end becausefuses are not polarized. You are checking to see if there is continuity throughthe fuse element. A reading of approximately 0.5 on a digital meter's LCDindicates a good fuse. Most digital meters read their own internal fusesresistance, hence 0.5 Ohms and not 0.00 Ohms. LCD readout of "O.L."indicates no continuity through the fuse. The fuse is bad and needs to bereplaced.
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