Net Safety MAN-0069, Руководство пользователя

Страница: 17 / 20

Net Safety Monitoring Inc
Modbus Controller & 4-20 Fire Head 13
Appendix D: E
LECTROSTATIC
S
ENSITIVE
D
EVICE
(ESD)
Electrostatic discharge (ESD) is the transfer, between bodies, of an electrostatic
charge caused by direct contact or induced by an electrostatic field.
The most common cause of ESD is physical contact. Touching an object can
cause a discharge of electrostatic energy
—ESD
! If the charge is sufficient and
occurs near electronic components, it can damage or destroy those components.
In some cases, damage is instantaneous and an immediate malfunction occurs.
However, symptoms are not always immediate
—p
erformance may be marginal
or seemingly normal for an indefinite period of time, followed by a sudden
failure.
To eliminate potential ESD damage, review the following guidelines:
• Handle boards by metal shields
—
taking care not to touch electronic
components
• Wear grounded wrist or foot straps, or ESD shoes or heel grounders to
dissipate unwanted static energy
• Prior to handling boards, dispel any charge in your body or equipment
• Ensure components are transported and stored in static safe packaging
• When returning boards, carefully package in the original carton and static
protective wrapping
• Ensure ALL personnel are educated and trained in ESD Control Procedures
In general, exercise accepted and proven precautions normally observed when
handling electrostatic sensitive devices.
A warning label is placed on the packaging, identifying product using
electrostatic sensitive semiconductor devices.