Why is my ESD protection ineffective
Presumably everyone wants to directly understand why I spent a lot of money to do ESD protection, but I feel that it has no effect. There are three reasons: the characteristics of static electricity, the staff and factories, and the lack of ESD protection programs.
1. The characteristics of electrostatic hazards: Hidden human body cannot directly perceive static electricity unless electrostatic discharge occurs, but the human body may not feel electric shock when electrostatic discharge occurs. This is because the electrostatic discharge voltage sensed by the human body is 2-3 KV, so static electricity Concealed. Potentiality The performance of some electronic components after being damaged by static electricity does not significantly decrease, but multiple cumulative discharges will cause internal damage to the device and form a hidden danger. Therefore, static electricity has potential to damage the device. Under what circumstances can random electronic components suffer electrostatic damage? It can be said that after a component is produced, until it is damaged, all processes are threatened by static electricity, and the generation of static electricity is also random. The damage is also random. The failure analysis of complex electrostatic discharge damage is time-consuming, labor-intensive, and costly due to the fine, fine, and tiny structural characteristics of electronic products. It requires high technology and often requires the use of high-precision instruments such as scanning electron microscopes. Even so, some electrostatic damage phenomena are difficult to distinguish from damage caused by other causes, making people mistakenly regard electrostatic damage failures as other failures. Before the ESD damage is fully understood, it is often attributed to early failures or unexplained failures, which unconsciously conceal the true cause of the failure. Therefore, static electricity damages electronic devices.
2. Staff Factory
People: 1. Single-loop wrist strap, unable to detect the contact impedance between the wrist strap and the skin of the personnel, causing ESD protection failure; 2. In the operation process, the wrist strap is not equipped correctly, and the static electricity cannot be effectively discharged, causing ESD protection failure; 3. Forgetting during operation Wear a wrist strap to directly touch the PCB board and cause ESD protection to fail. 4. The wrist strap is well worn during the operation, and the poor contact with the static wire causes ESD protection failure.
Machine: 1. The electrical leakage of the equipment's electrical outlet cannot be effectively discharged, causing ESD protection failure; 2. Vibration during the production operation of the equipment, movement caused the static line to fall off or poor contact, causing ESD protection failure; 3. The ion elimination equipment is not turned on during operation , Can not effectively neutralize the static electricity on the surface of the object and cause the failure of ESD protection; 4. The failure of the ion elimination equipment itself can not effectively control the ion balance, causing the failure of ESD protection. Method: 1. Special personnel regularly check regularly, and the problem cannot be found in the first time, and the personnel are time-consuming and labor-intensive; 2. The check report needs to be filled out manually, which is prone to errors, poor customer recognition, and the personnel are time-consuming and labor-intensive; 3. Production operators are concerned about ESD Not paying attention to it, not wearing a wrist strap and protection can not be found in time, causing ESD protection failure; 4. Production operators do not pay attention to ESD, and the ion elimination equipment cannot be detected in time without turning on the ion elimination equipment, causing ESD protection failure. 5. ESD protection measures cannot form digital, visualized data, and no data tracking analysis. Ring: 1. Exceeding environmental temperature and humidity cannot be detected in time, and automatic intelligent and effective management cannot be formed with humidification and dehumidification equipment; 2. Environmental temperature and humidity data cannot effectively form an effective data link with ESD protection system.
3. Insufficiency of the ESD protection program The four principles of electrostatic protection: 1. Environmental control 2. Personnel control 3. Packaging material control 4. Personnel training general methods for electrostatic protection. 1. Grounding: Grounding is to put static electricity into the ground through a wire connection, which is the most direct and effective anti-static measure. Common grounding methods for conductors include: wearing an anti-static wrist and grounding the work surface. 2. Electrostatic shielding: Electrostatic sensitive components will be exposed to areas with static electricity during storage or transportation. The method of electrostatic shielding can weaken the influence of external static electricity on electronic components. The most common method is to use electrostatic shielding bags as protection. 3. Ion neutralization: Insulators are often prone to generate static electricity. Grounding is ineffective to eliminate static electricity from insulators. The usual method is ion neutralization, that is, using ion fans and ion air guns in the working environment. The ESD protection plan does not strictly follow the above standards, and there is no regular maintenance and troubleshooting.
In general, there are many reasons why ESD protection equipment is installed, but the corresponding effect is not achieved. What I have mentioned are just a few of the more common reasons. According to factors such as the environment, factory conditions, product types, etc., each factory will have its own unique difficulties and problems. I hope the above can help you.