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A-iv GTECH Technical Training and Support Services
• MYTH: Wrist straps present a personal shock hazard when working on
live circuits because they ground your body.
FACT: As long as the 1-Megohm resistor is connected between the strap
and the ground connection the wrist strap does not increase your risk of
suffering a shock hazard. The 1-Megohm resistor limits the current to a
safe value for low-voltage circuits.
• MYTH: We don’t take precautions and we don’t have ESD problems at
our depot.
FACT: You may not realize the damage that you are causing, but it is
there. GTECH Engineering can determine if hard and intermittent failures
are due to ESD damage by examining individual components, but such
damage is not something that a technician can readily identify.
• MYTH: The GTECH terminal is not susceptible to static damage.
FACT: Our terminals can be damaged or destroyed by static discharge just
like any other electronic device.
ESD Precautions Checklist
Recommended Devices
• Wrist straps at the bench
• Wrist strap tester
• Only tools or parts made out of conducting materials (i.e., no plastic solder
vacuums, tweezers, etc.).
• 3M® anti-static vacuum cleaners
• Static-dissipative mats connected to earth ground for bench tops and
flooring
• Static-dissipative bags, boxes, bins and/or totes for handling PCBs (bags
and totes must remain closed during transport - no part of the item can
“stick out” of the bag or the bag is ineffective)
• Static-free floor mats, static-dissipative shelving, and 3M black conductive
PCB storage bags used at all times (stockroom)