How to Use a MULTIMETER - Beginners Guide (Measuring Volts, resistance, continuity & Amps)

Summary

This video tutorial is designed for beginners to learn how to use a multimeter, a device for measuring electrical values like voltage, current, and resistance. It explains the basics of electricity, including the difference between DC and AC current, and guides viewers through using a multimeter to measure these values, resistance, and continuity. The instructor demonstrates practical applications, such as testing a car battery or an outlet, and emphasizes safety precautions. The video also offers advice on choosing a good multimeter, recommending auto-ranging models for ease of use, and suggests additional tools like alligator clips and jumper wires. It concludes with suggestions on where to purchase a multimeter and the importance of selecting a reputable brand.

Takeaways

• 🔌 A multimeter is a device used to measure electrical values such as voltage, current, and resistance in electronic devices.
• 🔋 Multimeters are useful for checking devices in cars and homes and are inexpensive yet informative once you learn to use them.
• ⚡ Electricity can be static or electric current, with the latter being measured by multimeters and divided into DC (direct current) and AC (alternating current).
• 🔧 Multimeters come in two types: manual range and auto range, with the latter being easier to use for beginners.
• 🔌 The multimeter has two leads, red and black, which connect to different jacks depending on the measurement being taken.
• 🔋 DC voltage is measured with the red lead in the volt jack and is used for devices powered by batteries.
• 🏠 AC voltage is measured similarly but requires selecting the correct range for the voltage in your region, such as 200V or 750V.
• 🔍 Resistance is measured by turning the dial to the resistance setting, and it's important to disconnect the device from any power source for accurate readings.
• 🔊 Continuity checks for a complete path for electricity to flow and can be used to test for breaks in wires or fuses.
• 💡 Current measurement requires the multimeter to be in series with the circuit, and it's crucial to start with the highest range to avoid damaging the device.
• 🛠️ Auto-ranging multimeters simplify the process by automatically selecting the appropriate range for the measurement being taken.

Q & A

What is a multimeter used for?

A multimeter is used to measure electrical values such as voltage, current, and resistance in electronic devices found in cars or houses.

What are the two types of electric current mentioned in the script?

The two types of electric current mentioned are DC (Direct Current) and AC (Alternative Current). DC current always flows in one direction, like in devices that run off a battery. AC current changes direction, like the current coming from wall outlets and used by most appliances.

What are the two types of multimeters discussed in the video?

The two types of multimeters discussed are manual range multimeters and auto range multimeters.

What are the standard components included with a multimeter?

Multimeters come with at least two leads, one red and one black. The black lead always goes to the common jack, and the red lead goes to the appropriate jack depending on the measurement being taken.

How do you measure DC voltage with a multimeter?

To measure DC voltage, set the multimeter to the DC voltage setting, connect the red lead to the positive terminal and the black lead to the negative terminal of the device being tested.

What is the significance of the polarity when measuring voltage with a multimeter?

Polarity is significant because if the leads are connected backwards, the multimeter will display a negative reading, indicating the current is flowing in the opposite direction.

How should you approach measuring an unknown voltage with a multimeter?

When measuring an unknown voltage, start from the highest number available on the multimeter and work your way down until you get an accurate reading.

What is the purpose of measuring resistance with a multimeter?

Measuring resistance with a multimeter helps determine the ease with which current can flow through a circuit. It's also used to check the functionality of components like fuel injectors by comparing the measured resistance to manufacturer specifications.

How does the continuity function on a multimeter work?

The continuity function on a multimeter is used to check if there is an unbroken path for electricity between two points. If there is continuity, the multimeter will indicate this, often with a beep or a light.

What safety precautions should be taken when measuring AC voltage with a multimeter?

When measuring AC voltage, ensure not to touch the metal tips of the probes and check that the test leads are not damaged or have exposed wires to avoid the risk of electrocution when dealing with high voltage.

Why is it recommended to start with the highest setting when measuring current with a multimeter?

Starting with the highest setting when measuring current protects the multimeter from damage if the current being measured is higher than expected. If the reading is low, the setting can be adjusted down to milliamps for more accuracy.

What is the advantage of using an auto-ranging multimeter over a manual range multimeter?

An auto-ranging multimeter automatically selects the appropriate range for the measurement, making it easier and faster to use compared to a manual range multimeter where the user has to manually select the correct setting.

What additional features are suggested for a multimeter to enhance its functionality?

Additional features that can enhance a multimeter's functionality include the ability to read temperatures, record peak values, and include safety features.

What are some recommended accessories to purchase along with a multimeter?

Alligator clips and jumper wires are recommended accessories as they can help set your hands free when making measurements.

Where can one purchase a good multimeter and what brands are recommended?

A good multimeter can be purchased from any reputable electronic shop or online store. While good brands tend to be more expensive and aimed at professional use, most multimeters in the $50 to $100 range will serve the needs of beginners.