The anti-static wrist strap will alarm when it does not meet those conditions
When the anti-static wrist strap does not meet those conditions, it will alarm?
Anti-static wrist straps and wrist strap online monitors must be designed in accordance with ESD safety performance under normal circumstances and meet the "6.1.3.2" anti-static standard of ANSI ESD S20.20 paragraph.
1. When the anti-static wrist strap is plugged in, when the resistance between the human body and the ESD ground is less than 0.75MΩ
Indicator light: bright with alarm sound;
Reason: This means that the wrist strap is broken or not worn properly.
Note: The hazard relationship when the resistance between the human body and the ESD ground is less than 0.75MΩ is: when the human body comes into contact with leakage equipment or charged objects, there is a danger of electric shock! (Anti-static tips: 20mA current passing through the human body can feel electric shock, and 50mA current passing through the human body can cause shock or death.) So this value of 0.75MΩ is a safety factor. The wrist strap is equipped with a resistance above 0.75MΩ and below 2M
2. When the anti-static wrist strap is plugged in, when the resistance between the human body and the ESD ground is greater than 9.999MΩ
Indicator light: bright with alarm sound;
Reason: This means that the resistance of the wrist strap is too small or the resistance set by the online monitor is too small.
Explanation: When the resistance between the human body and the ESD ground is greater than 9.999MΩ, the hazard relationship is: constant 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 conducted. (Hazards of static electricity: For example, the withstand voltage parameters of electronic components are only a few volts or tens of volts. When the static electricity of the human body is greater than the component withstand voltage parameters, the electronic components in contact will be broken down and scrapped. Especially IC integrated circuits. Such as plastic case production lines , Due to static electricity, plastic shell painting, electroplating, rough surface, more trachoma, poor hand feeling. etc.
3. When the Pass indicator is on or only one indicator is off [Note: There are different styles of online monitors produced by different manufacturers: some have only one indicator; some have three indicators, namely LO/low resistance; PASS/Normal resistance; HI/High resistance]. Under the premise that the alarm does not alarm; it means that the user has been in close contact with the ESD ground, indicating that the wrist strap is well worn.