How to test electronic components using an avometer

Summary

In this tutorial, the speaker provides an in-depth guide on how to test various electronic components using a digital multimeter (avometer). He demonstrates how to measure DC voltage, test resistors, diodes, capacitors, and LEDs, as well as check the functionality of transistors. Through practical examples and clear explanations, viewers learn the proper techniques for assessing the health of these components and understanding the readings on a digital multimeter. The video is perfect for beginners looking to familiarize themselves with essential electronics testing tools and techniques.

Takeaways

• 😀 The digital multimeter has two test leads: black for ground and red for positive, used to test various electronic components.
• 😀 To test DC voltage, connect the multimeter to a battery's terminals and check the displayed value, which indicates the voltage level.
• 😀 For testing resistors, set the multimeter to the correct range (usually under 1MΩ) and observe the resistance value on the screen.
• 😀 Transistors can be tested to see if they are functioning normally by using the multimeter probes on the transistor leads.
• 😀 Potentiometers, which are adjustable resistors, should be tested similarly to resistors, with the value changing when adjusted.
• 😀 LEDs can be tested by connecting the multimeter probes correctly, where a working LED will light up when connected in the proper direction.
• 😀 Electrolytic capacitors (Elcos) should be tested by checking their polarity and monitoring their response to current flow.
• 😀 When testing diodes, make sure to check the current flow direction as the correct direction allows the diode to work properly.
• 😀 The speaker emphasizes the importance of not skipping parts of the video to fully understand the testing methods for different components.
• 😀 A digital multimeter can also test AC voltage, amperage, and resistance, which are key for diagnosing various electrical issues.
• 😀 The video provides hands-on examples of testing different components, including batteries, resistors, transistors, potentiometers, LEDs, capacitors, and diodes, offering practical learning.

Q & A

What is the purpose of a digital avometer?

A digital avometer is used to test and measure various electronic components, such as resistors, diodes, transistors, and the voltage of batteries or circuits, providing readings on its digital LCD display.

How do you test DC voltage using a digital avometer?

To test DC voltage, you connect the black probe to the ground (negative) and the red probe to the positive terminal of the battery or circuit. The avometer will display the voltage value on the screen.

What does the avometer display when testing a 9V battery?

The avometer shows the voltage of the 9V battery, which, if the battery is weak or near the end of its life, may display a voltage lower than the rated 9V, such as 8.7V.

What is the significance of testing with the correct probes?

Using the correct probes ensures that the readings are accurate. The black probe is always connected to the ground (negative) and the red probe to the positive terminal (or test point), which is crucial for correct voltage or current measurements.

How do you test a resistor with a digital avometer?

To test a resistor, place the probes on either side of the resistor. Ensure the resistance value displayed on the avometer corresponds with the expected resistance value. If the resistor value is too high, use a different setting or range on the avometer.

How can you test a transistor using a digital avometer?

To test a transistor, switch the avometer to the transistor testing mode. Place the probes on the collector, base, and emitter pins of the transistor. The avometer will show the transistor's health by indicating whether it allows current flow in the correct direction and at appropriate levels.

What is a potential issue when testing a resistor on the circuit board?

Testing a resistor while it is still part of a circuit can result in inaccurate readings due to the influence of other components. It is recommended to desolder the resistor for more accurate measurements.

How do you test a capacitor (Elco) with a digital avometer?

To test a capacitor, connect the probes to the capacitor’s leads, ensuring the correct polarity. A healthy capacitor will show an increasing or decreasing reading depending on the type, while a faulty capacitor may show no change or unusual values.

What is the significance of testing diodes using a digital avometer?

Testing diodes ensures they are functioning properly by checking if they allow current flow in one direction only. The correct polarity of the probes is essential for proper diode testing.

What is a potential issue when testing LEDs with an avometer?

When testing LEDs, it is important to check the polarity. LEDs only work when connected in the correct direction (positive to anode, negative to cathode). If tested incorrectly, they will not light up.