H3C Technologies H3C SecPath U200-A U200-M U200-S - Manual (Page 19)

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Figure 11 Using an ESD-preventive wrist strap
(1) ESD-preventive wrist strap (2) Lock
(3) Alligator clip
EMI
All electromagnetic interference (EMI) sources, from outside or inside of the UTM device and
application system, adversely affect the UTM device in a conduction pattern of capacitance coupling,
inductance coupling, electromagnetic wave radiation, or common impedance (including grounding
system) coupling. To prevent EMI, perform the following steps:
• Take measures against interference from the power grid.
• Do not use the UTM device together with the grounding equipment or lightning-prevention
equipment of power equipment, and keep the UTM device far away from them.
• Keep the UTM device far away from high-power radio launchers, radars, and equipment with high
frequency or high current.
• Use electromagnetic shielding when necessary.
Lightning protection
To protect the UTM device from lightning, do as follows:
• Make sure the chassis is properly grounded. For how to ground the UTM device, see " Grounding
the UTM device ."
• Make sure the grounding terminal of the AC power receptacle is properly grounded.