Anti-static wrist strap will not alarm in any situation
Anti-static wrist straps and wrist straps online monitors must be designed in accordance with ESD safety performance under normal conditions, in accordance with the "6.1.3.2" anti-static standard of ANSI ESD S20.20.
1. When the anti-static wrist strap is inserted, when the resistance of the human body and the ESD ground is less than 0.75 MΩ
Indicator light: light and alarm sound;
Reason: This means that the wrist strap is broken or not worn.
Note: The hazard relationship between the human body and the ESD ground is less than 0.75 MΩ: there is a risk of electric shock when the human body is exposed to leaking equipment or charged objects! (Anti-static common sense: 20mA of current passed by the human body has the feeling of electric shock, the current of 50mA can cause people to shock or die.) Therefore, the value of 0.75MΩ is a safety factor. The wrist strap is internally equipped with a resistance of 0.75 MΩ or more and 2 M or less.
2. When the antistatic spleen wristband is inserted, when the resistance of the human body and the ESD ground is greater than 9.999 MΩ
Indicator light: light and alarm sound;
Cause: This indicates that the wrist strap resistance is too small or the resistance set by the online monitor is too small.
Description: The hazard relationship between the human body and the ESD ground is greater than 9.999MΩ: the static movement of the human body will generate static electricity. When it is greater than 9.999MΩ, the static electricity of the human body cannot be effectively guided away. (Electrostatic hazard: For example, when the electronic component withstand voltage parameter is only a few volts or tens of volts, when the static electricity of the human body is greater than the component withstand voltage parameter, the contacted electronic components will break down and scrap. Especially IC integrated circuits. · For example, plastic shell production line, Due to static electricity, the plastic shell is painted, electroplated, rough surface, many trachoma, poor hand feeling, and so on.
3. When the Pass indicator is on or only one indicator is off
[Note: The online monitors produced by different manufacturers have different styles: some have only one indicator light; some have three indicator lights, which are LO/low resistance; PASS/normal resistance; HI/high resistance. If the alarm does not alarm, it means that the user has already intimate contact with the ESD to indicate that the wrist strap is well worn.