my country's automobile industry is developing rapidly, with increasing varieties and output, and gradually improving quality. From the electronic control system of traditional automobiles to the electrical system of electric vehicles today, a large number of electronic devices are used. The technology of comprehensive diagnostic equipment for vehicle offline based on modern automotive electronic technology is constantly developing. The circuit is already in the process of infinite miniaturization. The area on the circuit board is getting smaller and smaller, and the function is getting more and more powerful, which leads to difficulties in testing. Current circuit detection technology includes:

1) Manual visual inspection

In the early days of automobile development, people mainly inspected cars by eyes, ears and hands. For highly complex mounting boards, manual visual inspection is neither reliable nor economical. With microsphere array packaging, chip packaging and flip chip surface mounting boards, manual visual inspection is almost impossible. With the promotion of scientific and technological modernization, especially influenced by the progress of computer technology, the technology of comprehensive diagnostic equipment for vehicle off-line has made epoch-making progress and development. At present, people have been able to conduct safe, convenient and accurate inspections of automobiles through various advanced equipment.

2) Optical detection technology

Whether they are automated optical or automated X-ray, they are not as reliable as they should be, although they can help perform tasks that are difficult for human vision to accomplish. These technologies rely heavily on computer image processing, so improper processing can lead to calculation errors.

3) Functional testing

Functional testing is the current main trend of surface mount packaged devices and circuit board miniaturization. Once any system is too small to be detected internally, only a few input and output channels interact with the external world of the system. At present, the international standards for functional test instruments are becoming more and more mature, and standard instrument module technology and virtual instrument software technology have been widely used. It increases the versatility and flexibility of functional test instruments and helps to reduce costs.