How to Use a Digital Volt Ohm Multimeter to Measure AC Voltage

Avoid touching the metal contacts on the multimeter.

One of the most useful tools for troubleshooting electrical issues is the DVOM, or Digital Volt Ohm Meter. This versatile device can measure circuitry and diagnose trouble. It is capable of measuring AC/DC voltages, resistance in ohms, amperage and other functions based on the model owned. In a few steps, you can measure AC voltage.

Things You'll Need

• Multimeter
• Circuit to be measured

Instructions

1. Inspect the multimeter's leads and probes for damage and cracks. The voltage in a North American house circuit will range from 120 volts in the wall outlets, to 220 volts at the range and dryer outlet. Both of which can kill instantly. This is where extreme care and safety must be observed. If any damage or cracks is found, do not use the leads or probes. In addition, keep fingers behind the finger guard, making sure not to touch the metal contacts.

2. Choose a range which exceeds the voltage you expect to measure. You'll need to choose the AC scale.

3. Measure the AC voltage by placing one probe in the right socket and the other probe in the left socket of the AC receptacle.

Tips & Warnings

• Wall outlets in North America are usually 120 volts AC.

• European countries use 220 volts AC for wall outlets.

• Air Conditioners, ranges and some dryers use 220 volts AC.

• If you are unsure of what voltage you are measuring, get professional help.

References

• Doctronics: Using a Multimeter