Tools of the Trade: What Is A Digital Multimeter?
January 14, 2022
A multimeter is a measuring tool that can measure the voltage (volts), resistance (ohms), and current (amps) of an electrical component or device. A multimeter is a standard diagnostic used almost every day by electricians and individuals in related career fields.
There are two types of multimeters: analog and digital. Digital multimeters are more common because they provide better accuracy.
The first multimeter was invented in the early 1920s. It proved revolutionary. Before the multimeter, people were required to carry two or three bulky devices to measure voltage, resistant, and current. The multimeter combined all three and enabled measurement through a single device.
The original multimeter was analog in design. This means that electrical readings were displayed via a needle that rises and falls depending upon the volts, ohms, or amps measured.
Most multimers sold and used today are digital. Digital multimeters display measurement readings on a small screen. Digital multimeters are favored today because of their accuracy, reliability, and increased impedance.
Digital multimeters can range in price. The basic digital multimeter is capable enough in most instances. However, more expensive digital multimeters may come with specialized features that enable electricians to seek out more specific solutions to meet their needs.
In order to use a digital multimeter, you must become familiar with its layout.
From the top of the device to bottom, you will find:
- The display: Shows the measurement readout.
- The buttons: Enable you to select various functions; vary depending on model.
- The dial or switch: Allows you to select between ohms, volts, and amps.
- Input jacks: Where you plug in test leads.
It is important to note that multimeters enable you to measure direct current (DC) and alternating current (AC). Direct current is the flow of electric charge in one direction. Alternating current is the flow of electric charge that can change direction.
DC is generated in most devices powered by a battery. For example, automaker Tesla uses DC battery-powered motors in their Model 3 vehicles.
AC is generated in most residential and commercial power. The electricity that powers our homes and businesses is AC and can flow in two directions.
You will learn to use a digital multimeter and many other important tools as an electrical trainee.
You can’t become an electrician by reading a few books or watching online tutorials. In California, you must enroll in a certified electrical training program and take at least 720 hours of classroom and lab training.
The training program will teach you how to use important electrical tools, including a multimeter. You will get hands on experience testing ohms, voltage, and current using a multimeter in a lab setting. And you will get to work through issues presented by a multimeter – such as if you discover a lack of continuity – with the guidance of a teacher. This is just the type of work you will do on a real job site!
Multimeters are a key tool for electricians. As you can see, you will regularly use one They enable you to test the wires, batteries, and other electrical sources. And they are a great way to identify and troubleshoot issues such as lower-than-expected voltage or continuity problems. If you don’t know how to use a multimeter yet, that’s OK! You will learn as an electrical trainee.
If you are interested in becoming an electrician and learning how to use all the tools of the trade, get in touch with I-TAP today! Our staff can help you enroll in an upcoming semester. Contact us now.
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