EMI

All electromagnetic interference (EMI) sources, from outside or inside of the switch and application system, adversely affect the switch in the following ways:

• A conduction pattern of capacitance coupling.

• Inductance coupling.

• Electromagnetic wave radiation.

• Common impedance (including the grounding system) coupling.

To prevent EMI, use the following guidelines:

• If AC power is used, use a single-phase three-wire power receptacle with protective earth (PE) to filter interference from the power grid.

• Keep the switch far away from radio transmitting stations, radar stations, and high-frequency devices to make sure the EMI levels do not exceed the compliant range.

• Use electromagnetic shielding when necessary. For example, use shielded interface cables.

• To prevent signal ports from getting damaged by over-voltage or over-current caused by lightning strikes, only route interface cables indoors.