Filter
Top Products
MAINTENANCE & SERVICE GUIDE
PROSIGNIA NOTEBOOK 190
INDEX PAGE PRODUCT DESCRIPTION LEGAL NOTICE HOW TO USE THIS GUIDE
REMOVAL & REPLACEMENT ILLUSTRATED PARTS CATALOG TROUBLESHOOTING SPECIFICATIONS
Electrostatic Discharge
A sudden discharge of static electricity from a finger or other conductor can destroy
static-sensitive devices or microcircuitry. Often the spark is neither felt nor heard, but damage
occurs. An electronic device exposed to electrostatic discharge (ESD) may not be affected at all
and will work perfectly throughout a normal cycle. Although, it may function normally for a
while, then degrade in the internal layers, reducing its life expectancy.
Networks built into many integrated circuits provide some protection, but in many cases, the
discharge contains enough power to alter device parameters or melt silicon junctions.
Generating Static
The table shows how different activities generate static electricity and at different electrostatic
voltage levels.
Typical Electrostatic Voltages
Event Relative Humidity
10% 40% 55%
Walking across carpet 35,000 V 15,000
V
7,500 V
Walking across vinyl
floor
12,000 V 5,000 V 3,000 V
Motions of bench
worker
6,000 V 800 V 400 V
Removing DIPS from
plastic tubes
2,000 V 700 V 400 V
Removing DIPS from
vinyl trays
11,500 V 4,000 V 2,000 V
Removing DIPS from
Styrofoam
14,500 V 5,000 V 3,500 V
Removing bubble pack
from PCBs
26,000 V 20,000
V
7,000 V
Packing PCBs in
foam-lined box
21,000 V 11,000
V
5,000 V
NOTE: 700 volts can degrade a product.