Grounding and power connection
Two independent ground connections are necessary- one for the test system and one for the EUT. These must
be connected back to the local permanent installation or to a fixed, permanent ground conductor. To avoid
electric shock the power cord protective grounding conductor must be connected to ground.
System GND
The system is connected to GND via the earth wire of the connected mains power cable for the generator and the
EUT supply. A separate GND wire from the reference GND plane to the building earth point may be useful to
avoid interferences to other areas.
EUT GND
Ensure that a reliable return path for the interference current is provided between the EUT and the generator.
The GND wire from the generator to the reference GND and must be designed as a low inductance connection
suitable for high frequencies. The reference ground plane and the ground connections to the instruments, as
described in the relevant test standards, serve this purpose well.
Protection (optional)
A proposal is to separate protection of the EMC system with filters, insulation transformer or fault current
protection and other measures may be useful for the EMC installation. The advantage is the separation of the
EMC system from all other installation.
A shielded room with adequate filters may be the best solution for avoid unwanted conducted and radiated
interference to other areas.
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