The role of anti-static wrist strap
1. The wired anti-static wrist strap is introduced into the ground through an anti-static ground wire through a 1 Megohm resistor and a wire in the plastic box on the wrist strap. Connecting this resistor in series is mainly for personal safety considerations.
Generally, there are three ways to deal with static electricity:
1) Direct discharge means discharging static electricity to the ground through an electrostatic bracelet;
2) Neutralization by positive and negative ions in the air and static electricity generated by itself;
3) Dissipate static electricity through power-consuming materials;
The wired anti-static wrist strap is discharged through a 1M ohm resistor, the purpose is to avoid the impact of instantaneous high current on the components, and to avoid device damage! In the inspection of the factory's electrostatic protection system, it was found that some measures did not have the effect of preventing static electricity.
Such as anti-static chairs, anti-static logistics vehicles, etc. If there is no effect, just test it. It can be tested by friction electrification test. Good things will not generate voltage higher than 10V.
The function of 1M ohm resistor is to keep the impedance from static power to the ground at a proper resistance value, so that the static electricity can be quickly discharged to the ground without generating excessive current, damaging the equipment, and people will not feel pain. sense. Others such as the ground, tabletops, logistics vehicles, workstations, clothes, shoes, hats, gloves, etc. all have the same reason.
2. The theory of the cordless anti-static wrist strap is to use the principle of corona discharge to dissipate a part of static electricity. Corona discharge is also called tip discharge. It is the guide body's own charge that usually requires a voltage exceeding 1500V. In order to dissipate static electricity, the static voltage required to dissipate static electricity from a cordless wristband is too high, which is not suitable for the electronics industry, because how many electronic components can withstand high voltages above 1500V.