The floor of the production site, work surface mats, seats, etc. should meet the anti-static requirements. The workshop maintains a constant temperature and humidity environment. It should be equipped with anti-static material boxes, turnover boxes, PCB racks, logistics trolleys, anti-static packaging belts, anti-static wrist straps, anti-static soldering irons and tools.

 

(1) Set up anti-static areas according to anti-static requirements, and have obvious anti-static warning signs. According to the electrostatic sensitivity level 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

 

Above 16000V is a non-static sensitive product.

 

(2) The room temperature in the electrostatic safe zone (point) is 23±3°C, and the relative humidity is 45-70%RH. It is forbidden to operate SSD (static sensitive components) in an environment of less than 30%.

 

(3) Regularly measure the surface resistance values of the ground, tabletops, turnover boxes, etc.

 

(4) Non-production items, such as tableware, tea sets, bags, woolen fabrics, newspapers, rubber gloves, etc., are prohibited from being placed on the workbench in the electrostatic safety zone (point).

 

(5) Workers need to discharge when entering the anti-static area. Operators must wear work clothes and anti-static shoes and socks when operating. Electrostatic protection safety inspection must be carried out before each operation, and production can only be carried out after passing the test.

 

(6) Wear an anti-static wrist strap during operation, and measure whether the wrist strap is effective every day.

 

(7) When testing SSD, take one piece from the packing box, tube, and disk, measure one piece, put one piece, and do not pile it on the table. Components that fail the test should be returned to the warehouse.

 

(8) The sequence of power-on and power-off must be followed during the power-on test: low voltage→high voltage→signal voltage. The calling sequence is reversed. At the same time, note that the polarity of the power supply cannot be reversed, and the power supply voltage must not exceed the rated value.

 

(9) Inspectors should be familiar with the model, variety, and testing knowledge of SSD, and understand the basic knowledge of electrostatic protection.

 

Requirements for transportation, storage and use of electrostatic sensitive components (SSD):

 

(1) The SSD must not be dropped on the ground during transportation, and must not be arbitrarily separated from the package.

 

(2) The relative humidity of the warehouse where the SSD is stored: 30-40%RH.

 

(3) Keep the original packaging of the SSD during storage. If the packaging needs to be replaced, use a container with anti-static properties.

 

(4) In the warehouse, an anti-static special label should be pasted on the position where the SSD device is placed.

 

(5) When distributing SSD devices, use the method of visual inspection, and count the quantity in the original packaging of SSD devices.

 

(6) When writing, erasing and information protection operations on EPROM, the writer/eraser should be fully grounded, and an anti-static bracelet should be worn.

 

(7) Operators such as assembly, welding, panel repair, and commissioning must operate in strict accordance with electrostatic protection requirements.

 

(8) The tested and inspected printed circuit boards are sprayed once with an ion spray gun before packaging to eliminate possible accumulated static charges.

 

11. Management and maintenance of anti-static work area

 

(1) Formulate an anti-static management system and have a special person responsible for it.

 

(2) Spare anti-static overalls, shoes, bracelets and other personal items for use by outsiders.

 

(3) Regularly maintain and check the effectiveness of anti-static facilities.

 

(4) Check the wristband once a week (or every day).

 

(5) Check the grounding of table mats and floor mats and the performance of static eliminators once a month.

 

(6) Anti-static component racks, printed board racks, and turnover boxes; the anti-static performance of transport vehicles, table mats, and floor mats is checked every six months