PCB News - PCB boards are widely used in the field of printed circuit board automatic testing

PCB circuit board understands that the relevant application software is established on the PCB board machine, and 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 sent out through the test software.

The PCB board test system will have a new design idea. The design idea of an automatic test system based on the USB bus and a virtual instrument will be adopted to give full play to the role of the computer.

It is an attempt to replace the traditional instrument idea with a computer, thereby transforming the instrument itself. The volume is reduced, the development cost is reduced, and the development efficiency is improved.

After D/A conversion, the analog excitation signal required for the test is applied to the test system, and then the test circuit passes the test bus through the switch bus.

The switch matrix is connected to the switch while it is inhibited to turn on and off, and the tested PCB board It 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, the collected analog quantity is sent to the core control, and the corresponding digital quantity is obtained through A/D conversion., It is fed back by the software on the PCB machine and processed by the PCB machine to determine whether the PCB board is qualified.

On-line testing technology has broken through the previous method of using human eyes to detect circuit boards. On-line testing technology has high efficiency and low missed detection rate, and realizes the automation of the detection field. The design 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 has improved production efficiency, reduced the total cost of manufacturing, and increased the profit of the enterprise. It is a widely used detection technology at present, and it is an efficient, high-speed, and 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 of unplugged components and testing of embedded components.

Currently, the more commonly used test methods are: continuity test, in-circuit test, function Testing, edge testing, optical testing and X-ray testing, etc. On-line testing is based on the specific characteristics of the PCB board, selecting an appropriate testing method to combine one or more workpieces, complementing each other and making comprehensive use.