Производственная мебель и системы хранения Hoffmann Group 2026 - страница 562

GBP 57 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. Warning symbol ESD Protective Symbol for ESD sensitive devices. (for items that possess at least one ESD control property) 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 across plastic flooring ■ Friction against synthetic clothing ■ Moving plastic containers ■ Unrolling sticky tape ■ Moving conveyor belts The charge is passed to objects which are carrying 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 charges. The humidity Objects with the same charge repel each other. If a person is electrostatically charged, their should therefore be between 40% and 60%. hair will literally „stand on end“. An introductory video and further information about ESD can be found under the short link: https://hog.tools/ESD When is ESD dangerous? Danger to humans is unusual. Electrostatic discharge can, however, pose dangers in production plants in the electronics industry. Uncontrolled electrostatic discharges can lead to total failures as well as latent defects in electronic assemblies (semiconductor devices), which can result in high costs with regard to: ■ Product failures ■ Complaints 97 ■ Repair and exchange 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. 562