A multimeter refers to an electrical instrument that is used in measuring the various circuit parameters like resistance, current, and voltage. We have two kinds of multimeters, the digital and the analog type. The digital multimeter uses the LCD while the analog one has the needle indicator.
As the name suggests, the digital multimeter has more than one functionality. It measures the ohmmeter, voltmeter, and ammeter. The digital multimeter is preferred because it is cost-effective, small in size, and is easy to operate. It has a digital and analog converter that helps in providing a digital readout. The ohmmeter measures resistance, ammeter measures current, while the voltmeter measure voltage.
Parts of a Multimeter
The digital multimeter has different elements that are the buttons, dial, and display. The dial is instrumental in helping the individuals to move through the various input jacks and scales.
Different models of the multimeters have different display values. We have some models that can display up to seven digits while others only get to display three digits.
The digital multimeters are categorized in different classes based on their application. The CAT I multimeters are for the electronic devices that are not connected directly to the power supply of a building while CAT II is for appliances like a television set and computers that are connected to the power supply of a building. The CAT III is for the distribution lines, lighting systems in the large buildings, and for the motors. Last but not least, the CAT IV is for the three-phase connection that is typically used by different electricity providers.
Using the correct category for the given assignment is essential. The multimeters that are classified as the higher category have the high-energy fuse that is designed to protect them from the high-voltage input sources. The fuse protects the appliances from burning out.
Functions of the Digital Multimeter
The digital multimeter has different types of functions. It can measure voltage in the direct current and alternating current circuit. It can also measure current in the direct current and alternating current circuits and resistance across the individual circuit components, and the entire circuit.
We have different types of multimeters that can be used to record both the minimum and maximum values. We also have the special digital multimeters that can measure the frequency of the incoming signal and the capacitance of the capacitor.