Asymtek Century C-721 Series, Operation Manual

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Safety 3-11
ESD Precautions
Electrostatic Discharge (ESD), also known as “static discharge,” is the sudden transfer of electricity from
one object to another (including people and tools). ESD can cause severe, undetectable damage to
electronic parts and assemblies. Proper precautions must be taken to prevent the transfer of ESD damage
while you are handling sensitive components.
ESD is generally increased by the following:
•
low humidity (dry air)
•
movement across carpets
•
touching of plastics, synthetics, and insulators
Most of the time, you cannot detect the presence of ESD. Occasionally, you may feel a slight shock when
touching an object when ESD is particularly high. However, electronic components can be damaged by
imperceptible levels of ESD that you cannot feel. Assume that there is always ESD danger present in
your environment.
ESD damage can occur at any time when you are assembling, testing or handling electronic components.
The following are recommended ESD safety precautions to be used whenever handling electronic
components, parts or assemblies:
•
Wear an ESD wrist strap while performing all tasks.
•
If a wrist strap is not available, always touch a bare metal grounded surface to discharge built up
electricity before touching the electronic components.
•
Never allow anyone to enter your work area unless he or she is wearing a wrist strap.
•
Use a dissipative floor mat under your work area.
•
Use only ESD approved equipment.
•
Ground all tools and equipment, if possible.
•
Keep your work area clean and clear of items that can cause ESD, such as packing foam and
plastic envelopes.
•
Store all electronic printed wire board (PWB) and assemblies in static-safe bags.
•
Report any instances of ESD damage or potential damage to your supervisor immediately.