BP Human resource management

Unwanted Currents or Electrostatic Discharge ESD the acronym for electrostatic discharge is the momentaneous unwanted current that can cause electronic equipments to damage. Electronic assembly parts are very sensitive to static electricity that is why it can be damaged by its discharge. Static charges are created when non-conductive materials are divided.

Electrical Overstress Electrical overstress or EOS is the term used to define an over voltage or over current. Propagation of unwanted energy like solder extractors, spikes, testing instruments, soldering iron and other electronic operated equipment are some reasons for electronic overstress damage. To keep unwanted electrical discharges these electronic equipments must be designed not to produce undesirable electric discharges.

Safe Work Areas - ESD/EOS To prevent harm to sensitive components from spikes and static discharges ESD/EOS safe work area or Electrostatic Discharge/ Electrical Overstress work area are recommended. This is also the main purpose of ESD/EOS safe area.

Methods of Dealing and Storage

* The very first thing to do is for circuit board assemblies to be handled properly to its designated work areas. * Periodically checking of designated working areas is a must to guarantee safety from electrostatic discharges. Main areas of concern are right grounding methods, static dissolution of work surfaces, static dissolution of floor surfaces and the operation of ion blowers and ion air guns. * Materials like Styrofoam, plastic, fabrics, vinyl and other static generating materials must be kept out from designated working areas. * Like any other workplace the working are must be kept clean and neat. This is to prevent from contamination of circuit board assemblies. Smoking, eating and drinking must be prohibited in the working area. * Sensitive circuit boards and components must be enclosed and shielded in electrostatic discharge protective enclosure materials when not in used. Enclosure materials includes antistatic that provides antistatic cushioning for electronic assemblies, static shielding that keeps static electricity from passing through the package and last but not the least is static dissipative that is an over package that has enough conductivity to dissolve any static build up. * Circuit board assembly operator must wear one of the following: wrist strap connected to earth ground or 2 heel grounders and have both feet on a static dissipative floor surface. * Do not touch the circuits or the components of the circuit board assembly it should be handled on its edges. * The same as the circuit board assembly all its components must be handled in the edges especially the component leads. * Things that can cause solderability and epoxy adhesion like hand creams and lotions that contains silicone must not be used in the work area. There are now available lotions that prevent contamination of circuit boards. * To prevent physical damage stacking of circuit boards and assemblies must be prohibited. It is necessary to provide special racks and trays for handling.