How can I effectively control ESD?
For the customers who produce electronic products, the most fear is that the static electricity can not be controlled, which seriously affects the quality of the products. Some foundries will also be subject to the PK off-the-job qualification of the enterprises directly commissioned by the foundry, which seems to effectively control ESD. Static control hardware is still required, there must be static grounding, a channel to release static electricity, many people are unclear, why is the grounding unqualified, the factory will not pass? Do you want to know the effect or channel of electrostatic discharge, and know where to release the static channel? Understand the standards of the anti-static industry, strengthen the implementation of ESD, and do effective ESD protection measures.
Static electricity is generated by the contact separation of objects or even the induction of contact. Even the air around us is composed of atoms. When these airs flow, static electricity is generated. It can be said that it can be anytime, anywhere. Static electricity is generated. It is almost impossible to completely eliminate static electricity, but some measures can be taken to control the static electricity to the extent that it is not harmful.
How to control human body static electricity (human body static protection)?
The human body is the most common source of static electricity hazard. For static electricity, the human body is a conductor, so it can take electrostatic grounding measures on the human body. The production site must be equipped with anti-static floor and anti-static shoes, so that static electricity can be guided from the foot to the earth. . Pass the foot through the anti-static floor, anti-static shoes / socks, mats, form a combined ground, effectively release the body's static electricity.
Wear an anti-static wrist strap and ground it. The static person guides the earth from the hand to the ground. The hand is used to discharge the static electricity of the human body. The anti-static wrist strap is protected by an anti-prosthetic elastic band, a snap button, a spring cord, a protective resistor and a plug or clip. Head composition. The inner layer of the elastic band is woven with an antistatic yarn, and the outer layer is woven with a pass-through yarn.
The above two measures are practical, economical and effective electrostatic discharge routes, and should be selected according to different occasions.
Anti-static shoes and anti-static wrist straps make human safety problems
Only from the perspective of anti-static, the total resistance of the human body to the ground is as small as possible, but the small value is limited by safety. The human body must have a certain value of ground resistance, and a metal device or device can be formed. When the power frequency power supply is short-circuited, the resistor can limit the current flowing through the operating human body to ensure the safety of the personnel, and the small value should not be less than 105 Ω, and the current limiting resistance of the anti-static wrist strap is usually 1 M Ω, anti-static shoes. The minimum resistance should be no less than 105Ω, and the maximum resistance should not exceed 109Ω.