PCB circuit board uses the relevant application software which is established on the PCB board machine. The idea of virtual instrument is adopted, that is, various functions of traditional instruments are realized through software, including oscilloscope, signal generator, and various mathematical processing of collected data. During the test, a digital signal is given through the test software.
The PCB board test system will have a new PCB design idea. The design idea of automatic test system and virtual instrument based on USB bus will be adopted to give full play to the role of computer. The idea of replacing traditional instruments with computers is reduced the volume of the instrument and the development cost, improving the efficiency of development.
After D/A conversion, the analog excitation signal required for the test is applied to the test system, and then sent from the test circuit to the switch matrix through the test bus. The switch matrix is connected to the switch matrix and is controlled by the microprocessor to turn on and off. The test PCB board is fixed on the needle bed. The excitation signal is applied to the corresponding position of the printed circuit board. The response is measured by the test circuit. And the collected analog quantity is sent to the core control. After A/D conversion, the corresponding digital quantity is fed back by the software on the PCB machine and processed by the PCB machine to determine whether the PCB board is qualified.
The online test technology has broken through the previous method of using the human eye to detect the circuit board. The online test technology has high efficiency and low missed detection rate, and realizes the automation of the detection field. This detection system adopts the idea of combining with virtual instruments, which reduces the design of hardware and reduces the cost of the entire system.
The basic method of on-line testing of PCB board analog components and the testing method of diodes and transistors. This testing system is suitable for the application of small and medium-sized enterprises. It reduces the number of unqualified products entering the next process, thereby reducing the amount of product rework, improving the production efficiency of circuit boards, reducing the total cost of manufacturing, and increasing the profit of the enterprise. It is currently a widely used testing technology. An efficient, high-speed, high-precision detection method.
At present, PCB boards are used in the field of automatic testing of printed circuit boards with a wide range of tests, including testing without components and testing with components. Currently, the more commonly used test methods are: continuity testing, in-circuit testing, and functional testing, edge testing, optical testing and X-ray inspection, etc. On-line testing is based on the specific characteristics of the PCB board, selecting appropriate testing methods to combine one or more processes, complementing each other’s strengths, and comprehensively using them.
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