How to measure the quality of micro fuse? Detailed explanation of measurement methods and precautions

With the continuous popularization of electronic equipment, micro fuses play an irreplaceable role as an important component in protecting circuit safety. Micro fuses are small in size, but their performance is directly related to the safe and stable operation of the entire circuit. Therefore, accurately measuring the quality of microfuses has become a key link in electronic repair and inspection. This article will introduce the measurement methods of micro fuses in detail from many aspects to help you quickly judge the status of the fuse and ensure the safe use of the equipment.

A micro fuse usually consists of a thin metal wire and a casing. Its function is to break the fuse wire when the current exceeds the rated value, cutting off the circuit and protecting the equipment. Understanding its structure will help determine the focus of inspection, such as whether the wire is broken, whether the shell is damaged, etc.

Commonly used tools for measuring the quality of micro fuses include digital multimeters (multimeters), fuse testers, etc. A digital multimeter is the most common tool capable of measuringresistanceand on-off function to facilitate quick judgment of fuse status.

Set the multimeter to the on-off position and test that the probes at both ends touch both ends of the fuse. If the multimeter beeps, it means that the internal wires of the fuse are connected and the fuse is intact; if there is no sound, it means that the fuse is disconnected and needs to be replaced.

Set the multimeter to the resistance range (usually choose the 200Ω range) and measure the resistance at both ends of the fuse. The resistance of a normal micro fuse is very small, close to zero ohms; if the resistance value is significantly high or infinite, the fuse is damaged.

In addition to electrical testing, it is also important to observe the appearance of the fuse. Check the fuse glass or ceramic tube for cracks, scorch marks or discoloration, which are visual indications of an overloaded or damaged fuse.

When measuring, it is necessary to confirm the rated current and voltage parameters of the fuse to avoid misjudgment. Different equipment uses different fuse specifications, and using mismatched test standards may lead to incorrect judgments.

To ensure safety, the power supply should be disconnected when measuring the fuse to avoid electric shock or damage to the instrument caused by measuring when the circuit is live.

To ensure accurate measurement, it is recommended to conduct multiple measurements on the same fuse, especially when using the resistance range of a multimeter to avoid misjudgments due to poor contact.

The special fuse tester can quickly detect the status of the fuse and automatically determine whether the fuse is disconnected. It is suitable for batch inspection and professional maintenance occasions.

The quality of micro fuses directly affects the safe operation of electronic equipment, and accurate measurement is an important step in repair and maintenance. By understanding the structure of the fuse, rationally using the on-off and resistance settings of the multimeter, observing the appearance, and paying attention to the rated parameters, you can quickly determine whether the fuse is damaged. At the same time, power-off measurement and multiple confirmations are also key to ensuring measurement accuracy. After mastering these measurement methods, you can more effectively test microfuses to ensure the normal use and safety of the equipment.