Major misunderstandings of factory anti-static measures
Nowadays, more and more people are aware of the dangers of static electricity. For example, some factories have started to buy anti-static products such as anti-static clothes and anti-static shoes. But is this really anti-static? The answer is of course NO. This kind of practice is only to "paint the tiger according to the cat" and achieve the superficial phenomenon.
Common anti-static error methods are as follows:
1, no anti-static product testing equipment
The most common mistake 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, quality is good or bad, if there is no common testing equipment, we do not know whether the product is damaged, the quality is good. This will not achieve anti-static effects.
2, the ground wire connection is not good
a. The anti-static ground wire must not be connected to the power supply neutral line, and should 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.
b. 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).
C. The cross-sectional area of the grounding trunk line shall not be less than 100mm; the cross-sectional area of the trunk line shall be not less than 6mm; the grounding line of equipment and workbench shall be a multi-strand plasticized conductor with a cross-sectional area of not less than 1.25mm. Yellow-green lines are appropriate.
3. Use anti-static products as ordinary products.
Many companies use anti-static products as common products, thinking 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, only wear anti-static shoes do not wear anti-static clothing
In addition to wearing anti-static shoes, people must wear anti-static overalls to better control the static electricity of the human body. 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.
5, only wear anti-static clothing without wearing anti-static shoes
Some experiments have shown that people only wear anti-static overalls, such as not wearing anti-static shoes and not very good anti-static ground, anti-static effect is very poor.
6, 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 it can be introduced into the earth through the wrist strap. If the anti-static floor and the anti-static wrist strap are not available, the static electricity of the person will be 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.
7, incorrect use of wrist straps
The wrist strap is relatively easy to damage. Therefore, it is necessary to detect every day. A good wrist strap will also be too loose to be conductive because the worker is too loose. Therefore, a better method is to use the wrist strap on-line detector to detect it at any time. 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.
As can be seen from the above introduction, electrostatic protection is not only simple to use anti-static products, but also many other factors, and only after all aspects are analyzed and considered, it is possible to achieve the desired results.