caoporn视频在线丨亚洲黄色激情丨国产9 9在线 | 中文丨国产成人无码精品久久久露脸丨放荡的少妇2欧美版丨色视频无码专区在线观看丨黄网站在线观看视频丨亚洲蜜臀av乱码久久精品蜜桃丨一级免费黄色毛片丨在线观看免费人成视频色9丨黄色视屏软件丨久久偷偷丨极品少妇被猛得白浆直喷白浆小说丨欧美日韩国产麻豆丨黄片毛片一级丨久久99精品久久久久久水蜜桃丨日本免费一区二区三区在线播放丨欧美成片vs欧美丨成人免费网站入口www丨欧美成人欧美edvon丨亚洲成a人片在线观看www丨九九热线有精品视频86丨亚洲精品一区二区三区早餐丨成人av在线影院丨国产足控在线网站

ESD tester is actually an electrostatic discharge generator. Static electricity is caused by the mutual friction of two different substances, and high voltage is formed by the accumulation of positive and negative charges in two objects that rub each other. Man made fibers and plastics are common friction electrification materials. When friction generates voltage, ESD problems will occur. For electronic components, electrostatic energy can not be ignored. It can puncture semiconductor components and destroy electronic circuits.

Generally, ESD testers generate EMC problems in two main ways: conduction and radiation interference.

(1) Conduction mode. Electrostatic discharge current flows directly through the circuit, because ESD generates a high voltage. If it enters the semiconductor, misoperation may occur, and it is easy to damage the semiconductor devices. The internal insulation of modern semiconductor components often breaks down under dozens of volts and is permanently short circuited. This is a very serious ESD problem, which is common in daily life.

(2) Radiated interference. In case of electrostatic discharge (simulated test with electrostatic discharge tester), the generated spark voltage will generate radiated magnetic field and electric field. The magnetic field can induce noise voltage in each signal loop of the nearby circuit. Due to the large electrostatic current generated in a very short time, the noise voltage generated in the signal loop may exceed the threshold level of logic components, causing false triggering of components.

In the circuit, the ESD problem caused by human static electricity is the most common. In dry climate, human ESD voltage is easy to exceed 8Kv, 15kV or even 20kV, so we need to pay attention to the impact of such electrostatic voltage on PCB and components, and take corresponding measures to prevent ESD problems.