The Multimeter: A Handy Tool for Electricians and Electrical Engineers

The multimeter is a familiar device to everyone who specializes in the electricity sector. The device provides effective support for electricians and electrical engineers who need to test circuits, measure parameters, and so on.

The multimeter is an electrical measuring instrument with multiple functions. The basic functions include the ammeter, voltmeter, and ohmmeter. Furthermore, this device also can measure the power line frequency, capacitance capacitors, check transistors. Due to the usefulness of the device, many people need to purchase one. However, some people still have trouble finding the best multimeter to buy and understanding how to use it most effectively. This post will help you learn how to select and use a multimeter.

In fact, the multimeter is quite easy to use. Selection of the unit of measurement and scale can be performed by manipulating the buttons and switches on the device. Moreover, many modern multimeters can automatically select the scale.

Functions of multimeters

– Checking circuit connections: the machine will beep when the resistance between two probes is nearly equal to 0.
– Measuring small voltages or amperages when a large resistor is present.
– Measuring the inductance of the inductor and capacitance of the capacitor when checking and installing electrical circuits.
– Checking diodes and transistors.
– Providing support for temperature measurement using thermocouples.
– Measuring the average frequency when adjusting a radio circuit. The user would listen to the signal instead of seeing the signal as when using an oscillograph.
– Saving measurement data in the device.

Advantages and disadvantages of multimeter types: Analog multimeters

Analog multimeters are usually preferred for testing whether semiconductor components such as diodes, transistors, or MOSFETs are still active or not, because this type of device is easier to use for this task. They can also be used to quickly check damaged components in electronic circuits. Analog multimeters are relatively cheaper than their digital counterparts.

However, analog multimeters have some disadvantages. The needles or electronic circuits inside can easily break if the device is not used properly. It can also be difficult to read numeric values for voltage, current, and resistance accurately. The accuracy of analog multimeters is not as high as digital multimeters.

Advantages and disadvantages of multimeter types: Digital multimeters

Digital multimeters, on the other hand, are easy to read and follow the numerical values displayed on the screen. They offer high precision and durability. Digital multimeters can also be equipped with more advanced functions, such as measuring frequency or capacitance. However, they are more expensive than analog multimeters and can be difficult to use, especially for quick checks on electronic components.

How to use a multimeter to measure current and voltage

Method 1: Use the scale line

To measure the current using a multimeter, you need to measure the load consumption within the range allowed by the scale. Follow these steps:

Step 1: Set the device on the highest scale line.
Step 2: Connect the rods of the device to the load, with the red rod on the positive side and the black rod on the negative side.
The device will then provide the current values.

Method 2: Use DC scale voltage

Another method to measure current is by measuring the pressure drop across the resistor in series with the load limit line. The measured voltage divided by the limit value will indicate the current value. This method allows for measuring larger currents and is safer. To use this method, read AC and DC voltage values. When measuring DC voltage, read the value on the DCV.A index bar. If you set 250V for the scale, the highest value measurable is 250. When measuring AC voltage, read the values on the AC.10V bar.

In conclusion, the multimeter is an essential tool for anyone working with electricity. It provides accurate measurements and a range of functions to support electricians and electrical engineers in their work. Whether you choose an analog or digital multimeter, understanding how to use it effectively is crucial. With the right knowledge, you can make the most of this versatile device.