Printed circuit board

What are the basic knowledge and methods of PCB board inspection?

In our lives are exposed to the PCB can be more and more widely used because of its high reliability, high density, designability, production and other unique advantages are closely related to the demand for PCBs, whether in terms of production, performance indicators for many years showing rapid growth, accordingly, the quality of PCB inspection also put forward higher requirements, the traditional detection methods PCB board as an important part of modern electronic equipment, due to the small size of the SMD components, installation density, which requires further improvement in the integration of PCB board. PCB quality directly affects the quality of the entire electronic products, so PCB testing equipment is particularly important and critical. A way to check, but also to prevent more defective products generated to reduce losses of a necessary means.

When testing PCBs, we should pay attention to the following points.

1. Test the PCB board do not cause a short circuit between the pins;
2. Test PCB board to pay attention to the insulation properties of the soldering iron;
3. Test PCB board test instrument internal resistance to be large;
4. Test PCB board to pay attention to the power integrated circuit heat dissipation;
5. Test PCB board leads to be reasonable
6. Test PCB board to ensure the quality of welding
7. Test PCB board do not easily conclude that the integrated circuit damage
8. Test PCB board before to understand the working principle of integrated circuits and their related circuits

PCB testing should be done before the work what? First understand the environment when the equipment works, mainly considering the external electrical parameters on the equipment is likely to cause the impact; ask what phenomenon when the circuit board failure, and analyze the causes of failure; carefully look at the components on the circuit board to find out which components play a key role on the board; do a good job of anti-electromagnetic, electrostatic and other interference measures.

So, what are the common detection methods used in the production process of PCB boards? In addition to the higher cost of manual visual inspection, due to long visual inspection and a certain amount of error, coupled with the PCB wire spacing and component volume reduction, the requirements of manual visual inspection is also increasing, obviously, with the PCB production is increasing dramatically, this approach is increasingly inappropriate; there is a PCB board function test, the functional system test is in the middle of the production line and the end of the use of specialized The test equipment, the board’s functional modules for a comprehensive test to confirm the board’s good or bad. It requires special equipment and specially designed test procedures, the preparation of functional test procedures are complex, so it is not applicable to most circuit board production lines, but today there is a kind of dimensional testing is relatively speaking more applications, it uses the secondary image measuring instrument, measuring the hole, length and width, position degree and other dimensions. As PCB belongs to the small thin soft type of products, contact measurement, it is easy to produce deformation so as to cause inaccurate measurement, the secondary image measuring instrument has become the choice of high-precision dimensional measurement instruments. The image measuring instrument of Siren measurement can achieve fully automatic measurement after programming, not only the measurement accuracy is high, but also greatly shorten the measurement time and improve the measurement efficiency.

It is because PCB in today’s society has a wide range of applications, so the PCB inspection process may have questions, I am here to tell you personally after years of testing summed up some of the practical methods of operability, through the above way to provide you with the hope that we can provide useful reference in the practice of circuit board inspection work. GT PCB always adhere to the exquisite Technical strength, sophisticated production equipment, perfect testing methods, product quality above industry standards, warm and thoughtful service, won the praise and welcome of global businesses and users.


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