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A Anti-Static Practices
32 MiLLennium GPSCard and Enclosures Guide to Installation & Operation
PRIME STATIC ACCUMULATORS
Table 4 provides some background information on static-accumulating materials.
Table 4 Prime Static Accumulators
Work Surfaces • formica (waxed or highly resistive)
• finished wood
• synthetic mats
• writing materials, note pads, etc.
Floors • wax-finished
•vinyl
Clothes • common cleanroom smocks
• personal garments (all textiles except virgin wool)
• non-conductive shoes
Chairs • finished wood
•vinyl
• fiberglass
Packing and handling • common polyethylene bags, wraps, envelopes, and bubble pack
• pack foam
• common plastic trays and tote boxes
Assembly, cleaning, test and
repair areas
• spray cleaners
• common solder sucker
• common solder irons
• common solvent brushes (synthetic bristles)
• cleaning, drying and temperature chambers
HANDLING PRINTED CIRCUIT BOARDS
ESD damage to unprotected sensitive devices may occur at any time. ESD events can occur far below the threshold of
human sensitivity. Follow this sequence when it becomes necessary to install or remove a circuit board:
1. After you are connected to the grounded wrist strap, remove the circuit board from the frame and place it on a static-
controlled surface (grounded floor or table mat).
2. Remove the replacement circuit board from the static-shielding bag or clamshell and insert it into the equipment.
3. Place the original board into the shielding bag or clamshell and seal it with a label.
4. Do not put repair tags inside the shielding bag or clamshell.
5. Disconnect the wrist strap.