It’s important to ensure correct polarity connection of the multimeter probes before measurement to avoid short circuits or other accidents. Also, if you’re not familiar with the operation, it’s advisable to read the user manual of the multimeter or consult a professional for more detailed guidance.

A multimeter, also known as a multitester or VOM (Volt-Ohm meter), is a portable instrument used to measure voltage, current, resistance, and other electrical parameters. Depending on its functionality and features, multimeters can be classified into several categories:

Digital Multimeter (DMM): Utilizes a digital display screen to show measurement results, featuring high accuracy, portability, and readability. DMMs can measure DC voltage, AC voltage, DC current, AC current, resistance, capacitance, and may include special functions such as temperature measurement, frequency measurement, and continuity testing.

Analog Multimeter: Uses a pointer instrument to display measurement results, operating based on the proportional relationship between current and voltage. Analog multimeters can measure DC voltage, AC voltage, DC current, and resistance. Compared to digital multimeters, they have lower accuracy and are less easy to read but still have certain advantages in specific applications.

Auto-ranging and Manual-ranging: Multimeters can be categorized based on the method of range selection into auto-ranging and manual-ranging types. Auto-ranging multimeters automatically select the best measurement range, reducing user complexity. Manual-ranging multimeters require users to manually select the appropriate measurement range, offering flexibility but requiring some operational experience.

Special Function Multimeters: Apart from basic voltage, current, and resistance measurement functions, there are multimeters with special functions such as frequency measurement, temperature measurement, capacitance measurement, RPM measurement, and testing diodes and transistors. These function-specific multimeters are typically suitable for specific fields or professional requirements.

Multimeters can be classified into different categories based on display mode, range selection method, and special functions. When choosing a multimeter that suits your needs, consider the specific measurement requirements and budget to select the required features and characteristics.

A multimeter is a versatile measuring tool widely used in electronics, circuit testing, and appliance repair fields. Its functions include:

Voltage Measurement: Multimeters can measure both DC and AC voltage, useful for assessing circuit power, voltage stability, and appliance operation.

Current Measurement: Multimeters measure both DC and AC current, helping determine current intensity in circuits for power consumption evaluation, fault detection, and equipment load assessment.

Resistance Measurement: Multimeters measure resistance in circuits, useful for evaluating impedance, detecting resistance changes, analyzing circuit operation, and diagnosing faults.

Capacitance Measurement: Some advanced multimeters can measure capacitance, assessing the capacity of capacitors to store and release charge, and detecting capacitor damage or aging.

Temperature Measurement: Some multimeters have temperature measurement capabilities, typically through connecting temperature sensors for monitoring circuit or equipment temperature changes and detecting overheating.

Continuity Testing: Multimeters are used to check circuit connectivity and open or closed circuit conditions. Connecting two measurement points helps determine continuity or discontinuity.

Diode and Transistor Testing: Certain multimeters have functions to test diodes and transistors, verifying polarity, normal operation, and measuring their parameters.