Precautions in anti-static work
The anti-static production equipment must be well grounded, and the placement machine should adopt a three-phase wireless grounding method and be grounded independently. The ground, work surface mats, seats, etc. of the production site shall comply with the anti-static requirements. Maintain a constant temperature and constant humidity environment in the workshop. It should be equipped with anti-static box, turnover box, PCB turnover frame, logistics turnover car, anti-static bag, anti-static wrist strap, anti-static soldering iron and tools.
(1) Set an anti-static area according to anti-static requirements, and have obvious anti-static warning signs. According to the electrostatic sensitivity of the devices used in the work area, it is divided into 1, 2, and 3 levels, and different protective measures are formulated according to different levels.
Level 1 electrostatic sensitivity range: 0-1999V
Level 2 electrostatic sensitivity range: 2000-3999V
Level 3 electrostatic sensitivity range: 4000-15999V 16000V or more is a non-static sensitive product.
(2) The room temperature of the electrostatic safety zone (point) is 23 ± 3 ° C, and the relative humidity is 45-70% RH. It is forbidden to operate SSD (electrostatic sensitive components) in an environment below 30%.
(3) Regularly measure the surface resistance values of the ground, table top, and turnover box.
(4) Non-productive items such as tableware, tea sets, bags, woolen fabrics, newspapers, rubber gloves, etc. are prohibited on the workbench in the electrostatic safety zone (point).
(5) The staff enters the anti-static area and needs to be discharged. Work clothes and anti-static shoes and socks must be worn by the operator. It must be checked for static electricity safety before each operation, and it can be produced after passing the test.
(6) Wear an anti-static wrist strap during operation to measure the effectiveness of the wrist strap every day.
(7) When testing the SSD, take one piece from the box, tube, and disk, measure one piece, put one piece, and do not pile it on the table. Devices that fail the test shall be returned to the library.
(8) The power-on test must follow the sequence of power-on and power-off: low voltage → high voltage → signal voltage. The order of power-off is reversed. Also note that the polarity of the power supply must not be reversed and the supply voltage must not exceed the rated value.
(9) The inspector should be familiar with the model, variety and testing knowledge of the SSD and understand the basic knowledge of electrostatic protection.
10. Requirements for transportation, storage and use of electrostatic sensitive components (SSD)
(1) SSD shall not fall to the ground during transportation and shall not be arbitrarily removed from the packaging.
(2) Relative humidity of the warehouse where the SSD is stored: 30-40% RH.
(3) Keep the original packaging during the SSD storage process. If you need to replace the packaging, use a container with anti-static properties.
(4) In the warehouse, the anti-static special label should be attached to the position where the SSD device is placed.
(5) Apply the visual method when issuing SSD devices, and count the number in the original package of the SSD device.
(6) When writing, wiping, and information protection operations on the EPROM, the writer/eraser should be fully grounded with an anti-static bracelet.
(7) Operators of assembly, welding, repairing, commissioning, etc. must operate in strict accordance with the requirements for electrostatic protection.
(8) Tested and inspected printed circuit boards are sprayed once with an ion gun before packaging to eliminate static charges that may accumulate.