3-4
Figure 3-2
Wear an ESD-preventive wrist strap
(1) ESD-preventive wrist strap
(2) Snap fastener
(3) ESD socket
(4) Connector
Electromagnetic Interference Prevention
All possible interference sources, external or internal, affect the device in the way of capacitance
coupling, inductance coupling, electromagnetic radiation, and common impedance (including the
grounding system) coupling. To minimize the influence of interference sources on the device, take the
following into consideration:
Take effective measures to protect the power system from power grid interference.
Separate the protection ground of the device from the grounding device or lightning protection
grounding device of the common power supply equipments as far as possible.
Keep the device far from heavy-duty radio transmitters, radar transmitters, and high-frequency
devices.
Adopt electromagnetic shielding measures when necessary.
Lightning Protection
Although many measures have been taken to protect the device from lightning, damage to the device
may still happen if the lightning intensity exceeds a certain limit. To better protect the device from
lightning, do the following:
Ensure the PGND cable of the chassis is well grounded. Refer to “Connecting the PGND Cable” in
Chapter 4 “Installing the Firewall”.
Ensure the grounding terminal of the AC power socket is well grounded.
