What are the basic principles of electrostatic protection?
First, what are the basic principles of electrostatic protection?
a, suppress the accumulation of electrostatic charge;
b. Eliminate the static charges that have been generated quickly, safely, and effectively.
Second, anti-static work area Site 1, ground materials a, is prohibited from the direct use of wood flooring or laying hair, hemp, chemical fiber carpets and ordinary floor leather.
b. The ground made of static conductive material should be used, such as anti-static raised floor or laying of anti-static floor mat on ordinary ground, and effectively grounded.
c. It is allowed to use specially processed terrazzo floors, such as laying ground wire net in advance, carburizing or spraying antistatic agent on the floor.
2, grounding 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.
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 grounding wire should be yellow-green. It is appropriate.
e. Brazing should be used for the connection of grounding mains.
f. The connection terminals of the 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.
3. Ceiling materials Ceiling materials should be made of antistatic materials. Under normal circumstances, gypsum board products are allowed, and ordinary plastic products are prohibited.
4, wall fabric wall fabric should use anti-static wallpaper, under normal circumstances allows the use of plaster or lime paint wall, prohibit the use of ordinary wallpaper and plastic wallpaper.
5, humidity control a, anti-static work area of ​​the relative humidity of not less than 50% is appropriate.
b. It is allowed to use the humidifying equipment to spray preparations or water under the premise of not causing harmful effects on the products to increase the environmental humidity.
c. The humidity in the computer room shall comply with the relevant provisions in GB2887, and a similar room shall also comply with this requirement.
6. Regional boundaries The anti-static work area shall be marked with regional boundaries, and warning signs shall be hung in obvious places. The warning signs shall comply with GJB1649, and ionized air bathing equipment shall be installed at the entrance of the work area.
7. It is forbidden to use and contact the charge source that is easy to generate electrostatic charge in the charge source anti-static work area (see below).
Charge source:
Workbench surface, paint or varnish surface, ordinary plastic veneer, ordinary vinyl and resin surface floor plastic and ordinary floor leather, polished and waxed wood floor. Ordinary vinyl overalls, caps, shoes Ordinary polyester, synthetic fibers and nylon fabrics, plastics and ordinary rubber soles Operating tools and equipment Ordinary plastic boxes, shelves, bottles, trays and paper products, ordinary foam and general mobile tools, compressors , Jetting equipment, evaporation equipment, etc. III. Anti-static facilities for electronic products 1. Electrostatic safety workbench a. The electrostatic safety workbench is an essential part of the anti-static work area. It consists of a worktable, an anti-static desk mat, and wrist strap connectors. Ground wire and other components.
b. There should be no less than two wristband connectors on the antistatic table mat, one for operators and the other for technicians, inspectors or other personnel.
c. When necessary, static electricity static elimination devices shall be provided on the electrostatic safety workbench.
d. It is not allowed to stack plastic boxes (sheets), rubber, cardboard, glass and other static electricity-prone debris on the static safety worktable. The drawing materials should be put into the anti-static paper bag.
2. People with anti-static wrist straps directly touching static-sensitive devices should wear anti-static wrist straps. The wrist straps should have good contact with human skin. The wrist straps must have no irritation and no allergic effects on the human body. The wrist strap system has resistance to ground. Should be in the range of 106 to 108 Ω.
3. Anti-static containers During the development and production of electronic devices, all containers for storage and turnaround (SSDs, transfer boxes, printed board racks, component storage boxes, etc.) shall have electrostatic protection performance. Metal and normal plastic containers are not allowed. If necessary, the totes used for storing parts should be grounded.
4. Ionizing wind static eliminator eliminates electrostatic charge on the surface of insulating material. Ion wind static eliminator should be used.
5, anti-static overalls a, enter the anti-static work area or contact SSD personnel should wear anti-static overalls, anti-static overalls fabrics should meet the requirements of GB12014.
b. In the environment where the relative humidity is greater than 50%, anti-static overalls are allowed to use pure cotton products.
6. Anti-static work shoes The personnel entering the anti-static work area or contacting the SSD should wear anti-static work shoes. The anti-static work shoes should meet the relevant regulations of GB4385. Normal shoes are allowed under normal circumstances, but conductive shoes or heel straps should be used at the same time.
7. When antistatic vehicles transport SSDs or entire components containing SSDs, they should use antistatic performance transport vehicles.
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