Test the use of anti-static wrist strap
There are no pre-specified minimum requirements for testing anti-static wrist straps, but a very good experience is that it will be tested every time you wear an anti-static wrist strap or start another job. The test frequency depends on your fully protected electrostatic discharge sensitivity equipment. If the equipment is quite expensive and controlled by the operator, regular monitoring is necessary, but if the equipment is not particularly sensitive and the price is relatively low, then regular testing is sufficient. There are several things that need to be checked when testing antistatic wrists: conductive fiber or metal/conductive material is close to the skin; the snap on the metal clasp is suitable, the snap connector on the coil end should be fastened, the spring of the banana plug is elastic, and the banana plug The plug hole is in close contact. Other things to check are: intermittent interruption in the coil (usually at the end), dirt welded in the belt, oil and shell (which will reduce the conductivity of the belt), so the press on the metal snap ring in the coil It is safe to apply 1-5 pounds of tension to the buckle.
Is it necessary to wear an anti-static wrist strap if all other ESD precautions are taken? (That is, two grounding (foot) straps, blouses, floor consumables, grounding plates, etc.). If so, why?
If the operator wears two anti-static shoes on the conductive floor, and does not lift both heels at the same time, the anti-static wrist is unnecessary. If the operator also wears a blouse, but is not electrically connected to the body or the ground, then the blouse has only a partial protection function, and the electric charge accumulated on it may have no place to release. The common grounding method of the jacket is to tie a snap button on the waist of the jacket with a string, or fix it on the inner cuff of the ESD jacket with an anti-static wrist.