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How to Check AC Volts with a Multimeter

A multimeter is a versatile tool for measuring voltage and current. Electricians use multimeters to measure alternating current, or AC, and direct current, or DC, voltages and currents. Many multimeters also measure resistance, capacitance and temperature. For example, an electrician uses the multimeter's AC voltage setting to determine if a wall outlet has power or if a power supply is functioning. This knowledge helps the electrician pinpoint the cause of an electrical problem and select the appropriate repair.

Instructions

- 1
  Plug the black voltage probe into the voltmeter jack marked "COM."
- 2
  Plug the red voltage probe into the voltmeter jack marked "V."
- 3
  Rotate the range selector knob to the highest range setting, which is marked "VAC."
- 4
  Turn the voltmeter on. Slide the power switch to the "ON" position.
- 5
  Touch the probes to the device for which you measure the AC voltage. Use extreme caution. Ensure that the probes do not come into contact with anything but the surface you are measuring.
- 6
  Read the voltmeter's display. Turn the range selector knob to a lower range if voltage is less than the currently selected range.

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