As the drawings show in EN61000-4-8, one way to achieve the required field
is to let the ground plane be the fourth side of a square loop. I have
found it more convenient to construct stand-alone loops that can be placed
over and under the EUT which is supported above an appropriate ground plane.
I would surmise that the requirement to ground one side of the loop is
based on safety of the person performing the test. A multi-turn loop
conceivably could require more than a few volts to achieve the required
current flow to produce the desired magnetic field intensity.
>Can someone explain to me why a ground plane is required in the test setup for
>EN 61000-4-8 (power frequency magnetic fields)?
>
>Thanks,
>Bob Heller
>3M Company
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