17Figure 20 Use an ESD-preventive wrist strap123(1) ESD-preventive wrist strap (2) Lock(3) Alligator clipCAUTION:Check the resistance of the ESD-preventive wrist strap for safety. The resistance reading should be in therange of 1 to 10 megohm (Mohm) between human body and the ground.EMIAll electromagnetic interference (EMI) sources, from outside or inside of the router and application system,adversely affect the router in a conduction pattern of capacitance coupling, inductance coupling,electromagnetic wave radiation, or common impedance (including grounding system) coupling. Toprevent EMI, perform the following steps:• Take measures against interference from the power grid.• Do not use the router together with the grounding equipment or light-prevention equipment ofpower equipment, and keep the router far away from them.• Keep the router far away from high-power radio launchers, radars, and equipment with highfrequency or high current.NOTE:Use electromagnetic shielding when necessary.Lightning protectionTo protect the router from lightning better, do as follows:• Make sure the grounding cable of the chassis is well grounded.
