What Is a Multimeter?

A multimeter, also known as a multi-tester or a VOM (volt-ohm-milliammeter), is a versatile electronic measuring instrument used to measure various electrical quantities. It typically combines several measurement functions into a single device, allowing users to measure voltage and resistance.

 

The basic multimeter has three main components: a digital or analog display, a rotary selector switch, and two or more test leads with probes.

 

Parts of a Multimeter

Display: shows the measured value in the chosen unit of measurement.

Selector: switch allows users to select the desired measurement function.

Test leads: connected to the measured circuit or component, enabling the multimeter to make electrical contact and obtain accurate readings.

Here are the main measurement functions of a multimeter：

Voltage (DC and AC): 

Multimeters can measure the voltage across a circuit or component, both in direct current (DC) and alternating current (AC). DC voltage is typically used to measure the voltage of batteries, power supplies, and other DC sources, while AC voltage is used for mains electricity and alternating signals.

Resistance: 

Multimeters can measure the resistance of a component or an entire circuit. This is useful for checking the continuity of wires, testing resistors, and diagnosing faulty components.

Continuity: 

Multimeters often have a continuity test function that helps determine if there is a continuous path between two points in a circuit. It is commonly used to check for broken wires, faulty switches, or bad connections.

Multimeters are widely used by electricians, technicians, engineers, and hobbyists for troubleshooting electrical problems, testing components, and verifying circuit conditions. They are essential tools for anyone working with electronics or electrical systems.