Yantai SMT processing teaches you how to distinguish between good and bad circuit boards

Nowadays, there are more and more electronic components. From the earliest air conditioner and TV remote controls to today's major home appliances and high-tech products like mobile phones and computers, circuit boards are indispensable core components. With the continuous improvement of SMT processing technology in Yantai, product quality has been enhanced. However, there are still some unscrupulous manufacturers who pass off inferior products as high-quality ones. Below, the editor will teach you how to distinguish between good and bad circuit boards:

I. Bed of Nails Test

This method uses spring-loaded probes that connect to each test point on the circuit board. The springs give each probe a pressure of 100-200g to ensure good contact with each test point. An array of such probes is called a "bed of nails." Under the control of testing software, the test points and test signals are programmed, allowing the tester to obtain information from all test points.

II. Observation

Circuit boards are small in size and complex in structure, so corresponding observation instruments are necessary for inspection. A portable video microscope can be used to observe the structure of the circuit board. Through a video microscope camera, the microstructure of the circuit board can be seen clearly and intuitively.
This method makes circuit board design and inspection easier. The portable video microscopes currently used on factory floors, such as the MSA200 and VT101, enable "observation anytime, inspection anytime, and multi-person discussion," which is more convenient than traditional microscopes!

III. Flying Probe Test

The flying probe tester does not rely on a pin pattern fixed in a fixture or on a frame. In this system, two or more probes are mounted on tiny, magnetically controlled heads that can move freely in the X-Y plane. The test points are controlled directly by CADI Gerber data.

Dual probes can move within 4 mils of each other. The probes can move independently, and there is no real limit to how close they can get to one another. Testers with two arms that move back and forth are based on capacitance measurement. The circuit board is pressed tightly against an insulating layer on a metal plate, which acts as the other metal plate of a capacitor. If there is a short circuit between the lines, the capacitance will be greater than at a determined point. If there is an open circuit, the capacitance will be smaller.

The methods for distinguishing the quality of circuit boards are basically the three mentioned above. In fact, quality identification of the circuit board is one aspect; the main thing is to keep your eyes open and purchase high-quality products. Choosing a reputable manufacturer is always a wise decision. Yantai Zhange Electronics Co., Ltd. focuses on providing customers with SMT patch assembly, manual insertion wave soldering, turnkey processing (material sourcing and assembly), and other services. It is a service-oriented enterprise integrating production and research and development. The company is located in Yantai, Shandong, a beautiful port city with convenient transportation, and has long-term cooperation with various small, medium, and large enterprises.