Several principles of anti-static wrist ring
1.The wired anti-static bracelet is used to introduce static electricity into the earth through the anti-static grounding wire through a 1 megohm resistor in the plastic box on the wrist strap and the wire. The series connection of the resistor is mainly for personal safety considerations.
Three ways to discharge static electricity
Generally, there are three ways to deal with static electricity;
1) Directly discharge the static electricity to the ground through the static bracelet;
2) Neutralize the positive and negative ions in the air and the static electricity generated by itself;
3) Dissipate static electricity through power-consuming materials;
The wired electrostatic ring is discharged through a 1M ohm resistor, the purpose is to avoid the impact of the instantaneous large current on the component, and to avoid the damage of the device!
During the inspection of the factory's electrostatic protection system, I found that some measures did not have the effect of anti-static. Such as anti-static chairs, anti-static logistics vehicles, etc. Whether it is effective, just do a test. It can be tested by friction electrification test, and good things will not produce a voltage higher than 10V.
The function of the 1M ohm resistor is to keep the impedance from the static source to the earth at a suitable resistance value, so that the static electricity can be quickly discharged to the earth without generating excessive current, damaging the equipment, and people will not feel pain. sense. Others such as the floor, tabletop, logistics vehicle, station equipment, clothes, shoes, hats, gloves, etc. are the same.
The theory of cordless wristbands uses the principle of corona discharge to dissipate part of the static electricity. After the conductor itself is charged, it usually requires a voltage exceeding 1500V, and part of it will discharge into the air to dissipate static electricity. However, the dissipation of the cordless wristband The electrostatic voltage required for static electricity is too high, which is not suitable for the electronics industry, because how many electronic components can withstand high voltages above 1500V?