Anti-static-process requirements
A. Conventional anti-static process requirements:
1. The operator must wear a wired anti-static wrist;
2. The table surface that involves the operation of static sensitive devices must be equipped with an anti-static table mat and be grounded;
3. ESD-sensitive devices must be transported and stored with static shielding and anti-static equipment;
4. When preparing to unpack and test electrostatic sensitive devices, it must be carried out on an anti-static workbench. If necessary, an ion air generator can be used to ** the charge in the air;
5. The welding equipment and forming tooling equipment used for assembly must be grounded;
6. The ground wire of the power supply system should be reliable, prevent floating ground wire, and the ground resistance should be less than 1 ohm;
7. During product testing, when the power is on, the device cannot be plugged in or unplugged at will, and it must be plugged and unplugged when the power is turned off;
8. Any ESD-sensitive device should not be taken out of the original package prematurely, and the operation must be performed correctly, and try not to touch the legs of the ESD-sensitive device;
9. When using wave soldering, the solder and the delivery system must be grounded.
B. In occasions with strict anti-static requirements, the following anti-static process requirements are often required.
1. When conducting high and low temperature test or aging test for ESD-sensitive whole machine, static electricity level test must be carried out on the work site and high and low temperature box first, and the potential must not exceed the safe value, otherwise, static elimination treatment must be performed;
2. When the soldered printed circuit board is to be treated with three preventions, anti-static measures should also be adopted. Do not use ordinary brushes, ultrasonic cleaning or spray cleaning;
3. Low-resistance instruments and equipment (such as signals, bridges, etc.) used in debugging, measurement, and inspection should be connected to the input terminals of ESD-sensitive devices after the ESD-sensitive devices are connected to power;
4. On the production line of ESD sensitive products, the electrostatic potential test should be strictly used to monitor the change of electrostatic potential, so as to take static elimination measures in time.