How to Test a Receptacle with a Multimeter

Use your digital multimeter to test an outlet to see if it has the correct voltage.

Before beginning any repairs on an AC outlet or receptacle, always turn the circuit breaker that powers the outlet to the "off" position. As an extra safety measure, test the outlet before removing the cover. Testing ensures that you can work safely around the outlet. You can test the outlet by plugging a portable lamp into the socket. If you do not have a small lamp, use your digital multimeter to test the outlet.

Instructions

1. 

   Set your digital multimeter to measure AC voltage.

   Turn your digital multimeter on. Switch the meter to monitor AC volts. "V" and "~" will be the marking.

2. Place the red, or positive, probe in the smaller of the two slots. Place the black probe in the larger slot. Inserting the probes into these slots will measure the voltage between the hot wire and the neutral wire. The voltage should be approximately 120 volts AC.

3. Place the red, or positive, probe in the smaller of the two slots. Place the black probe in the ground terminal, or the round opening. Inserting the probes into these openings will measure the voltage between the hot wire and ground. The voltage should be approximately 120 volts AC.

4. Place the red, or positive, probe in the large slot. Place the black probe in the ground, terminal or the round opening. Inserting the probes into these openings will measure the voltage between the neutral wire and the ground. The voltage should be less than 0.5 volts AC.

References

• Multimeter Warehouse: How to Use a Multimeter
• Black & Decker: How to Test a Receptacle for Power
• Electrical Estimators: How to Test an Electrical Receptacle
• Wiring Help: How to Wire a Receptacle