STMicroelectronics Manufacturers

Methods to judge the quality of FPC circuit board: 1： Distinguish the quality of the circuit board from the appearance Generally, the appearance of FPC circuit board can be analyzed and judged from three aspects

Commonly used electronic components are: resistance, capacitance, inductance, potentiometer, transformer, diode, triode, MOS tube, integrated circuit, etc.

Now Si8000m and Si9000e also have a new option of XFE cross-modeling function, which Polar Instruments can provide. More than 98% of PCB manufacturers including Hongtai use Polar.​

Substances and materials in nature can be divided into three categories: conductors, semiconductors and insulators according to their conductivity. The resistivity of semiconductor is in the range of 1m Ω· cm ~ 1g Ω· cm (the upper limit is taken according to Xie jiakui's electronic circuit, and 1/10 or 10 times of it; because the angle mark is not available, the current description is used temporarily)

With the development of printed circuit board technology and its applications, the industry has put forward more new requirements for the safety of printed circuit boards. Therefore, it is necessary to establish a safety standard that belongs to China's printed circuit boards.

The environment in an industrial workshop is different from that of ordinary places, especially in production and processing workshops. Summer temperatures are already high, and combined with the heat dissipation from the machines, temperatures in the workshop often reach over 60°C, and in some cases even reach 80°C. The HDI PCB in industrial control equipment are the "brains" of the equipment. If they are not heat-resistant enough, problems can easily arise. These include circuit aging, component loss, and even direct short circuits. If the equipment stops, the entire production line will be affected.