APPENDIX H Electrostatic Discharge (ESD) Practices
OEM7 Installation and Operation User Manual v4
233
l
Do not allow chargeable plastics, such as binders, within 0.6 m of unshielded PCBs.
l
Do not allow a PCB to come within 0.3 m of a computer monitor.
H.2 Prime Static Accumulators
Table 62: Static-Accumulating Materials
below provides some background information on static
accumulating materials.
Work Surfaces
l
formica (waxed or highly resistive)
l
finished wood
l
synthetic mats
l
writing materials, note pads and so on
Floors
l
wax-finished
l
vinyl
Clothes
l
common clean room smocks
l
personal garments (all textiles)
l
non-conductive shoes
Chairs
l
finished wood
l
vinyl
l
fiberglass
Packing and handling
l
common polyethylene bags, wraps, envelopes and
bubble pack
l
pack foam
l
common plastic trays and tote boxes
Assembly, cleaning and repair
areas
l
spray cleaners
l
vacuum desoldering iron
l
common soldering irons
l
common solvent brushes (synthetic bristles)
l
cleaning, drying and temperature chambers
Table 62: Static-Accumulating Materials
H.3 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.
