Factory common error anti-static method - Solutions - Huaqiang Electronic Network

LC03-3.3 SOP8 TVS Static Protection 3.3V

1. The most common mistake of no anti-static product testing equipment is that many companies have purchased a lot of anti-static products, but they have not purchased some common anti-static product testing instruments. We know that each product has a certain period of use, and the quality is good or bad. If there are no common testing instruments, we do not know whether the product is damaged or not. This will not achieve anti-static effects.
2. Ground connection is not good
a. The anti-static system must have an independent and reliable grounding device. The grounding resistance should be less than 10Ω. The embedding and testing methods should meet the requirements of GBJ 97.
b. The anti-static ground wire shall not be connected to the power supply neutral line and shall not be shared with the lightning protection ground wire. Because lightning strikes and other phenomena will affect the performance and personal safety of the product through the circuit.
c. Use three-phase five-wire system to supply power, and its ground wire can be used as anti-static ground wire (but the neutral wire and ground wire must not be mixed).
d. The cross-sectional area of ​​the grounding trunk line shall not be less than 10mm2; the cross-sectional area of ​​the trunk line shall be not less than 6mm2; the grounding line of the equipment and the workbench shall be a multi-strand plasticized conductor with a cross-sectional area of ​​not less than 1.5mm2, and the color of the grounding line shall be yellow-green. It is appropriate.
e. The connection method of the grounding main line should be brazed.
f. Anti-static equipment connection terminals should ensure reliable contact, easy to install and disassemble, and allow the use of various clip-on connectors, such as squid clips, plugs, etc. g. The grounding system monitoring alarm should be installed in the workplace where the grounding resistance value is high. It is possible to monitor whether the ground wire is in good contact with the earth at any time.
3. Use anti-static products as ordinary products. Many companies use anti-static products as common products. They think that the products are not deformed and can be used without breaking. In fact, this is a misunderstanding. For example, an anti-static wrist strap can only be used for a few months. When used for a period of time, the appearance may not be damaged, but the wrist strap is often found to be broken during testing.
4. Don't pay attention to socks and insoles. People usually wear socks or pad insoles when wearing anti-static shoes. People who are prone to sweating, these socks and insoles will also lead to static electricity, but some people who are not easy to sweat can wear Some anti-static tweezers and pad insoles, this sock and insole can not lead to static electricity, so the static electricity of the human body can not be introduced into the earth through the shoes. Therefore, a "composite body resistance detector" is placed at the entrance of the machine room or factory building, which can quickly and accurately detect those who wear unqualified anti-static shoes, socks and insoles. Workers are advised to wear anti-static slippers in the summer while not wearing tweezers. In winter, they can wear cotton socks but not nylon socks.
5. Only wear anti-static shoes without wearing anti-static clothing. In addition to wearing anti-static shoes, you must wear anti-static overalls to better control the human body static electricity. Because clothing can also carry a high degree of static electricity, especially most of the current clothing is chemical fiber, can produce thousands of volts of static electricity.
6, wear only anti-static clothing does not wear anti-static shoes
Some experiments have shown that people wear only anti-static overalls, such as not wearing anti-static shoes and not very good anti-static ground, anti-static effect is very poor.
7. Anti-static clothing and shoes are worn but no anti-static floor and no anti-static wrist strap. We know that the static electricity of the human body should be guided through the anti-static shoes, or through the wrist strap to the earth. There is no static floor or anti-static wrist strap, and the static electricity of that person is difficult to guide away. It is best for qualified companies to have anti-static flooring and anti-static wrist straps. Unconditional companies must have at least an anti-static wrist strap.
8. Incorrect use of wrist straps Wrist straps are relatively easy to damage, so it is necessary to detect them every day. Good wrist straps are also too loose and not conductive because workers wear them. Therefore, the best way is to monitor them with the wrist monitor online. However, there are many companies that do not even have a wrist strap tester. A wrist strap has not been used for more than a year, so it is not effective.
9. The theory of anti-static cordless wristband with cordless wristband is to use the principle of corona discharge to dissipate a part of static electricity. Corona discharge is also called tip discharge. After the body is charged, it usually needs more than 1500V, its tip part. The air is discharged to dissipate static electricity, but the static voltage required for the cordless wristband to dissipate static electricity is too high, and is not suitable for the electronics industry because there are not many electronic components that can withstand high voltages above 1500V. Therefore, we do not recommend the use of a wireless wristband.