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Test circuit
The rule of thumb for the growth of any OEM or PCB manufacturer or EMS supplier is to provide high-quality printed circuit boards to help customers turn over quickly. Determining test methods and techniques is a key step in the strict inspection and quality inspection of maintenance, manufacturing and development during the assembly and manufacturing process. There are various standard types of tests that must be performed on the printed circuit board before and after the component is mounted on the circuit board.
When the printed circuit board layout is complex and the manufacturing volume is small, the best test solution is flying probe testing. Due to the development of the latest technology and the increasing demand for PCB prototype services, flying probe detection methods have become more and more popular. However, when the layout is simple but the manufacturing volume is high, then the best test solution is in-line (IC) testing. The important purpose behind these types of test methods is to eliminate maximum failure coverage, higher beneficial production testing, cost efficiency and minimize field failures.
The basis of flying probe test technology is mainly to emphasize the improvement of access power, test speed and coverage of larger fault coverage. Flying probe is an ideal technology because of its low evolution cost, compactness and low evolution time. In the test design, the circuit board, the equipment on the circuit board and the function of the test equipment must be considered. The main development and testing required is to significantly correct the speed in the circuit and mechanical path.
When the printed circuit board has low compatibility, one of the main reasons is damage to the internal circuit path, and this causes many component failures, which can be easily detected by using online testing techniques. As for the high-complexity circuit board, there are some shortcomings, that is, long programming is required, which is more cumbersome and cumbersome in IC testing. The power signal is activated to check the voltage level and resistance measurement at different nodes of the circuit board.
Online testing is used to detect parameter failures, design related failures and component failures. It can easily detect manufacturing defects, and it is also easy to measure component values when it is not in the circuit.
In order to overcome some of the shortcomings in online testing, there is a best testing method, namely functional testing, which is the best choice for testing equipment, because it has a higher fault coverage, no programming is required, and fewer on-site returns, More reliable fixtures, and lower overall cost. Therefore, functional testing is a key part of electronic product quality assurance.
One of the biggest challenges facing test engineers and their managers is keeping up with technological trends. By studying these methods and technologies, product quality will be better positioned in the best test process in the next few years.
