134 Каталог HOFFMANN GROUP 2016 Производственная мебель для работы и хранения Вер. 47 Стр.134

Каталог HOFFMANN GROUP 2016 Производственная мебель Стр. 134 0134 ENG Lab2u

Hoffmann Group 47 What is ESD ESD = Electrostatic Discharge A spark or a breakdown is caused by a large difference in potential, which produces high electrical voltage pulses in electronic equipment. How does ESD happen Electrostatic charging occurs when charges are separated. This happens when two different materials rub against each other or are separated. Examples of separated charges: Walking over plastic floors Friction with synthetic clothing fabrics Moving plastic containers Unrolling adhesive tapes Movement of conveyor belts A charge is exchanged between bodies at a higher charge to bodies with a lower charge. It can even create a visible spark. This can be observed when a grounded object is touched, such as a radiator. Low humidity encourages the formation of electrostatic charge. Humidity should therefore be between 40% and 60%. A Warning symbol for ESD sensitive devices (2) Symbol for an ESD protection component Objects with the same charge repel each other, if a person is electrostatically charged, their hair will literally,stand on end". When is ESD dangerous Danger to humans is unusual. Electrostatic discharge can, however, pose dangers in production plants in the electronics industry. Uncontrolled electrostatic discharge can lead to total failures as well as hidden defects in electronic assemblies (semiconductor devices), which can result in high costs with regard to: Product failures Complaints Repair and replacement costs Loss of reputation Loss of customers Circuit board with ESD sensitive components (ICs) Four golden rules 1. Always assume that all active devices are ESD sensitive. 2. Only handle electronic devices in electrostatic protected areas (EPA) and only if they are properly grounded. 3. Store and transport ESD sensitive devices in ESD protected containers. 4. Check the ESD protection system regularly. Follow the principle „Where there is no charge, there can be no discharge." Making as few movements as possible and using ESD safe equipment keeps the risk of static charge caused by personnel to a minimum. 134