How to check 240 Voltage with a Multimeter UK?

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A multimeter is a type of electronic instrument that electronic technicians and engineers frequently use. It’s also known as a VOM (volt-ohm-milliampere) and is a multi-measurement electronic measuring device.

They can be used for everything from simple testing like battery voltage measurement to fault detection and complex diagnostics, and they come in both analog and digital configurations.

It is used to measure voltage, current, and resistance, which are the three basic electrical characteristics. It can also be used to determine whether two points in a circuit are electrically connected.

They’re used by electricians to troubleshoot electrical problems in motors, power supplies, appliances, circuits, and wiring systems. DIYers can also learn how to use multimeters to take basic measurements around the house.

Types of Multimeter

  • Digital Multimeter: A measuring instrument, such as a digital multimeter, is the most widely used test equipment in various industries. It improves accuracy by obtaining multiple signal samples in less time. It also includes an automatic ranging feature, which eliminates the need for the operator to select the measurement manually.
  • Autoranging Multimeter: There is a knob in the middle of this type of multimeter, and there are fewer positions. As a result, it is used in simple electronic projects and does not control by design to measure. For electricians and beginners, these tools are highly recommended. Normally, this meter only measures one component at a time.
  • Analog Multimeter: An analog multimeter, also known as a moving coil device, uses a microammeter and a needle to calculate voltage, current, and other parameters. You can easily calculate different quantities by changing the setting of the switch on the meter with the help of several removable probes.
  • Fluke Multimeter: This multimeter is equipped with several features. This meter is used to calculate resistance and voltage and usually comes with a large display. It’s used to change the voltage, current, and electrical unit, among other things.
  • Clamp Multimeter: This multimeter has a clamp feature that calculates amps after the volts from the two probes have been calculated. By multiplying the voltage reading by the amps, you can adjust the power consumption. It also has a bonus feature that allows you to choose from a variety of settings.

Advantages of Multimeter

  • Data can be sent and received with other devices using electrical output.
  • Due to the high input impedance, there is no effect from loading.
  • At longer viewing distances, clear readings can be obtained.
  • It is possible to automatically display the output.
  • It can polarize automatically.
  • Since the technology is integrated, these are less expensive.

Disadvantages of Multimeter   

  • The LCD must be powered by an external source, such as a battery because when the battery is depleted, the LCD becomes dim and difficult to read.
  • The meter must be used according to the manufacturer’s specifications and the category rating; otherwise, the meter will be damaged, resulting in the loss of equipment.


  • Consistence and resistance testing
  • A faulty power cable can be identified by determining the frequency and testing the switch.
  • A battery can be tested, as well as an outlet.
  • It’s used to regulate temperature and the environment.
  • Checking diodes
  • Calculation of AC/DC
  • AC/DC Voltage Detection
  • It is possible to test old incandescent light bulbs.
  • Time and frequency calculations
  • Requirements for power and isolation

How to check 240 Voltage with a Multimeter UK?

Step1: Examine

Examine and learn the settings of your 240-volt wall outlet. A 240-volt wall outlet contains 3 slots: two identical slots angled at 45 degrees (occasionally vertical) and one mid- slot lower than the two vertical slots. The two vertical slots each carry 120 volts, while the third or middle slot is grounded.

Step2: Plugin Probes

Connect the black and red test probes to your multimeter and set the range to 240 volts AC on the dial. To avoid electric shock, never touch the metal tip of the probes while they are in use.

Step3: Begin Testing

Put one test probe’s metal ends in any of the tilted 120-volt slots, and the other probe’s metal ends in the next identical slot. Check your multimeter’s reading. The two 120-volt circuits that are connected to your multimeter require a total current of 240 volts.

Set the multimeter to 120 volts by turning the dial. Consider placing the black probe’s metal tip in the middle (ground) slot and the red probe’s metal tip in any of the tilted 120-volt slots. Approximately 120 volts AC should be read on your multimeter.

Step4: Results

If it doesn’t, the circuit isn’t working properly. Check the other 120-volt slot with the same procedure to see if it’s operational. If your multimeter doesn’t read around 240 volts, one or both circuits may be malfunctioning.

Safety Tips

  • Never use your bare hands to touch a live wire. Wear an insulating glove even if you’re only going to move or fix the cable.
  • Change the multimeter’s mode from DC to AC whenever you need to measure an electrical value in an AC circuit.
  • Check that the circuit is completely de-energized and discharged before connecting or disconnecting a multimeter.
  • When using a multimeter to measure resistance, never turn on the circuit.
  • Start your testing with the current range with the most current.


A multimeter is a tool that can be used to check various aspects of your electrical system. An electronic multimeter can be used to test the voltage of wires by any homeowner. To test the 240 voltage of wires, simply follow the instructions above.

You can read our blog on How To Test Parking Sensors With A Multimeter?


Is it safe to use a multimeter to check an outlet?

Read the instructions that came with your multimeter before using it to test an outlet, and avoid touching the metal prongs. You might get electrocuted if you do so. Checking the voltage of an outlet is simple, and you can also inspect the outlet’s casing to ensure it is safe.

How do you test for voltage drop using a multimeter?

Voltage drop occurs when current flows across a resistance or along a power cable. Rerun the cycle for estimating voltage at the two focal points and subtract one from the other to compute voltage drop.

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