Common anti-static methods for static electricity prevention

In many electronic factories, they use a lot of anti-static products, why is it often electrostatic damage? We are talking about the common factory anti-static method.

1. No anti-static product testing equipment

The most common mistake is that many companies have purchased a lot of anti-static products, but have not purchased some commonly used anti-static product testing instruments. We know that each product has a certain period of use and quality is good or bad. If there are no commonly used testing equipment, we do not know whether the product is damaged or not. This will not achieve anti-static effect.

2. The ground connection is not good

a, anti-static system must have an independent and reliable grounding device, grounding resistance should generally be less than 10Ω, buried and testing methods should meet the requirements of GBJ97.

b. The anti-static ground wire must not be connected to the power supply neutral line and must not be shared with the lightning protection ground wire. Because lightning strikes and other phenomena will affect the performance of the product and personal safety through the loop.

c. When using three-phase five-wire power supply, the ground wire can be used as an antistatic ground wire (but the neutral wire and ground wire must not be mixed).

d. The cross-sectional area of ​​the grounded main line should not be less than 100mm2; the cross-sectional area of ​​the branch line should not be less than 6mm2; the ground wire of the equipment and the workbench should use multiple strands of plastic conductors with a cross-sectional area of ​​not less than 1.25mm2. The color of the ground wire should be yellow-green. It is appropriate.

e. Brazing should be used for the connection of grounding mains.

f. The connection terminals of anti-static equipment should ensure reliable contact and easy assembly and disassembly, allowing the use of various clip-on connectors such as squid clips and plug holders.

g. The grounding system monitoring alarm should be installed in workplaces with high grounding resistance requirements.

3. Use antistatic products as ordinary products

Many companies use the anti-static products as ordinary products. They think that the products will not be deformed and can continue to be used without breaking. In fact, this is a misunderstanding. For example, the anti-static wrist strap can only be used for a few months. When it is used for a period of time, the appearance may not be damaged. However, when testing, it is often found that the wrist strap has been broken.

4. Do not pay attention to socks and insoles

Usually people wearing anti-static shoes will wear socks or cushions insoles, sweaty feet, these socks and insoles will thus lead static, but some people who do not sweat easily wear anti-static tweezers And pad insoles, this socks and insoles can not guide static electricity, so the body's static electricity can not be introduced into the earth through the shoes. Therefore, the “human body comprehensive resistance tester” is placed at the entrance of the machine room or factory building. The human body comprehensive tester can quickly and accurately detect those who wear unqualified anti-static shoes, socks, and cushioned insoles. It is recommended that workers wear anti-static slippers in the summer and do not wear tweezers. They can wear cotton socks in the winter but do not wear nylon socks.

5. Only wear anti-static shoes do not wear anti-static clothing

In addition to wearing anti-static shoes, people wear anti-static overalls to better control the body's static electricity. Because clothing can also bring high static electricity, especially most of the current clothing is chemical fiber, can generate thousands of volts of static electricity.

6, only wear anti-static clothing does not wear anti-static shoes

Experiments have shown that people wear anti-static overalls only if they do not wear anti-static shoes and do not have good anti-static ground, and their anti-static performance is extremely poor.

7. Anti-static clothing and shoes are worn but there is no anti-static floor and no anti-static wrist strap

We know that the static electricity of the human body must be led through anti-static shoes to the anti-static floor or through the wrist strap to the earth. If the anti-static floor and the anti-static wrist strap are not available, then the person's static electricity will be difficult to guide away. It is best for qualified companies to have anti-static flooring and anti-static wrist straps. Unqualified companies must have at least anti-static wrist straps.

8. Incorrect use of wrist band

Wrist straps are relatively easy to damage, so to detect every day, a good wrist band will be too loose for workers to wear and not conductive, so the best way is to use the wrist strap online monitoring monitor at any time. However, there are many companies that do not even have a wrist strap tester. A wrist strap that was used for more than a year does not have to be broken. This is not an electrostatic discharge effect.

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