How to Discharge a Capacitor in Large Machinery - iFixit 维修指南

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简介

Use this guide to discharge a capacitor in your large device.

If you're discharging a capacitor for a small device, follow this guide instead.

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1. 步骤 1 Create a capacitor discharge tool
  Inspect your capacitor and note the following:
  
  The voltage rating of either your capacitor or the device
  
  Where the terminals are located
  
  Attach two wires to an incandescent lightbulb—making sure the bulb's voltage rating is greater or equal to the capacitor's.
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3. 步骤 2 Discharge the capacitor
  Don't touch the two wire leads together during this step, as this could short circuit the capacitor.
  
  Lay one wire lead on the head of the terminal.
  
  While holding the lead in place, lay the other wire lead on the opposite terminal to complete the circuit.
  
  Hold this position for a few seconds or until the lightbulb completely darkens.
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4. 步骤 3 Check with a multimeter
  If you have a multimeter, you can check to see if the capacitor is fully drained.
  
  Set the meter to its DC voltage measuring mode and measure across the terminals.
  
  Any value under 10 volts means your capacitor is sufficiently drained.
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结论

For other general electronics skills, click here.

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