With the rapid development of my country's automobile industry, the types and production volume continue to increase, and the quality has been significantly improved. From the traditional vehicle electronic control system to the current electric vehicle electrical system, a large number of electronic products are used. The vehicle off-line comprehensive diagnostic equipment technology based on modern automotive electronic technology continues to develop in the future. Circuits have been in the process of endless miniaturization. The size of the circuit board is getting smaller and smaller, and the functions are becoming more and more professional, which makes the inspection difficult. Current circuit nondestructive testing technology includes:

1) Manual estimation

In the early days of vehicle development, people mainly inspected vehicles with their eyes, ears and hands. For highly complex mounting boards, manual inspection was neither reliable nor economical. With micro-sphere array packaging, chip packaging and flip-chip surface mounting boards, manual visual inspection was almost impossible. With the promotion of technological modernization, especially driven by the development of electronic information technology, the technology of vehicle offline comprehensive diagnosis equipment has undergone revolutionary development and progress. At present, people can already conduct safe, convenient and accurate inspections of vehicles through a variety of professional equipment.

2) Electron optical nondestructive testing 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 humans to do visually. These technologies rely heavily on computer image processing, so any processing errors can result in calculation errors.

3) Functional testing

Functional testing is a major trend in the miniaturization of surface mount packaged devices and circuit boards. If any operating system is too small to be tested internally, only a few input and output channels interact with the external world of the operating system. At present, the testing equipment used for functional testing equipment is becoming more and more sophisticated, and standard instrument control module technology and single-chip application software development technology have been widely used. The integrated diagnostic equipment for the whole vehicle off-line increases the practicality and operational flexibility of the functional test equipment and helps to control costs.