Find out the wrong anti-static method at the production site
(1) 1. There is no anti-static product testing equipment * A common mistake is that many factories have purchased many anti-static products, but they have not purchased some commonly used anti-static product testing equipment. We know that each product has a certain period of use, and the quality is good or bad. Without some commonly used testing equipment, we don't know whether the product is damaged or the quality is good. In this way, there is no anti-static effect.
2. The grounding method is not good. a. The anti-static system must have an independent and reliable grounding device. The grounding resistance should generally be less than 10 ohms and meet the requirements of GBJ 97. b. The anti-static ground wire must not be connected to the neutral wire of the power supply or shared with the lightning protection ground wire. Because lightning strikes and other phenomena will affect product performance and personal safety through the loop. c. Use a three-phase five-wire system for power supply, and its earth wire can be used as an anti-static ground wire (but the neutral wire and the ground wire must not be mixed). d. The cross-sectional area of the grounding trunk line should be no less than 100mm2; the cross-sectional area of the branch trunk line should be no less than 6mm2; the grounding wire of the equipment and workbench should be a multi-stranded plastic-coated wire with a cross-sectional area of 1.25mm2, and the color of the grounding wire should be yellow-green. Appropriate. e. The connection method of the grounding trunk line should be brazed. f. The connecting terminals of the anti-static equipment should ensure reliable contact, easy to assemble and disassemble, and allow the use of various clip-type connectors, such as snap fish clips, plug sockets, etc. g. Grounding system monitoring and alarming devices should be installed in workplaces that require high grounding resistance values. For example, the grounding system monitoring and alarming devices produced by our company can monitor whether the ground wire is in good contact with the earth at any time.
3. Use anti-static products as ordinary products. Many factories use anti-static products as ordinary products, thinking that the products can be used without deformation or breakage. In fact, this is a misunderstanding. For example, an anti-static wrist strap can only be used for a few months. After a period of use, the appearance may not be damaged. However, it is often found that the wrist strap is broken during testing. It is recommended to check the anti-static wrist strap frequently.