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| + | [title] Discharge the capacitors using a multimeter |
|---|---|
| + | [* black] Set your multimeter to the highest voltmeter setting (e.g. 600V on the one shown) and ensure the probes are connected to the correct terminals. |
| + | [* black] Connect the red probe to the solder on the red wire and the black probe to the solder on the black wire. |
| + | [* black] ***WARNING:*** Be careful not to touch the two probes together while doing this. It would short-circuit the capacitor and dump a large amount of charge very quickly. Also be careful not to touch the metal on the probes. |
| + | [* black] Look at the meter reading. It could start in the >300V range. If you don't see a reading, make sure the probes are making a good connection. If they are, and you still don't see a reading, drop the voltmeter setting a couple of notches (e.g. to 20V) and try again. The capacitors may already be (mostly) discharged. |
| + | [* black] You should see the voltage dropping as the capacitor discharges through the multimeter. |
| + | [* black] Continue to discharge until the voltage reduces to a significantly lower level (e.g. <20V), then switch to a more sensitive voltmeter setting (e.g. 20V) to maintain accuracy and continue discharging. |
| + | [* black] Discharge speed will slow down the lower the voltage gets. Once it slows to a crawl at a low voltage (<10V), you can intentionally short-circuit the capacitor with the probes to quickly discharge the remaining charge. |
| + | [* black] Verify the capacitors are fully discharged using the multimeter at a more sensitive setting (e.g. 2V). The reading should be at or close to 0V. ***Note:*** If the reading starts increasing it's because the multimeter is starting to charge the capacitors. Short-circuit them one last time and turn off the multimeter. |
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