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5. Always avoid unnecessary movement of body, such as scuffing feet across flooring, when
handling ESDS equipment. Such movement will generate additional charges of static
electricity.
6. When removing or replacing ESDS equipment, hold the device or assembly through the
electrostatic-free wrap, where possible. If this is not possible, lift the device or assembly
by its body only. Do not touch component leads, connector pins, or any other electrical
connections or paths, even though they are covered by conformal coating.
7. Do not allow ESDS equipment to come in contact with clothing or other ungrounded
materials that may have an electrostatic charge. Charges on nonconductive material are
not equal. For instance, a plastic storage bag may have a - 10,000 volt potential 1/2 inch
from a +15,000 volt potential with many such charges all over the bag. Do not hand ESD
equipment to another person until it is safely packaged for protection for ESD.
8. When moving ESDS equipment, always touch the surface on which it rests with bare skin
for at least one second before lifting. Before setting it on any surface, touch the surface
with your free hand for at least one second. Contact with the bare skin provides a safe
discharge path for charges accumulated while you are moving around.
9. While servicing equipment containing ESD devices, do not handle or touch materials such
as plastic, vinyl, synthetic textiles, polished wood, fiberglass, or similar items that can
generate static charges; unless you repeat the grounding process with the bare hands
after contacting these materials.
10. Where possible, avoid repairs that require soldering at the equipment level. Soldering
irons must have heater/tips assemblies that are grounded to an electrical ground. Do not
use standard plastic solder suckers (special antistatic solder suckers are commercially
available).
11. Ground the leads of test equipment momentarily before you energize the test equipment
and before you probe ESD devices or assemblies.
12. Work benches used for setting ESDS equipment should have ESD protective work sur-
faces. These work benches should also have personnel ground straps. These straps
prevent discharge of static electricity from personnel handling ESDS items on the work
bench surface. The work bench surface should be connected to ground through a ground
cable. The resistance in the bench top ground cable should be located at or near the point
of contact with the top of the work bench. The resistance should be high enough to limit
any leakage current to 5 milliamperes or less. This takes into consideration the highest
voltage source within reach of grounded people and all the parallel resistances to ground,
such as wrist ground straps, table tops, and conductive flooring.
Bulletin 639510
May 2005
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