Antistatic wrist straps or ESD wrist straps are worn by people working in static sensitive devices and assemblies to prevent them building up charge on themselves which could be transferred to the static sensitive item.
Typically wrist straps are used with other anti-static precautions so that the item being worked upon is in a static free environment where charge which might damages the components is safely dissipated.
As movement by people generates static charge, this charge needs to be given a safe route to ground, and the antistatic strap enables this to be achieved.
The ESD wrist strap is worn by the operator working on an item of electronics, providing a high resistance path to ground and in this way prevents static build up which could harm the electronic circuit.
Two parts of the anti-static wrist strap
Antistatic wrist strap :Outer surface made from a non-conductive material and an inner surface that is conductive, often using silver yarn.
Lead：a snap connector( have 1MΩ inbuilt resistor) is used at one end of the and a crocodile clip at the other. This enables the antistatic wrist strap to be connected to a variety of earth points.
By ground wire material: PVC / PU / silver plated / carbonaceous material.
By bracelet material: metal, dust-free silicone, rubber band.
By discharge method: ordinary type / double circuit / corona discharge.