I think the ideal test rack an O-scope or spectrum analyzer say enclosed in a screen room has a dedicated ground also bonded to the isolated secondary shield. The primary shield is only tied to the (dirty) input PE ground.
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the screen room can also be a ground plane on the bench top, for best results the test equipment is bonded to that. this is the clean ( reference ) ground.
The secondary screen is connected to that by way of bonding including the metal conduit to the mains filter boxes.
The clean ground is connected to a dedicated good earth ground.
there is no connection between secondary and primary but the magnetic path.
PE only connects to primary screen. (its the dirty ground return.)
link http://surflibrary.org/ses/Tempest/Tempestpapers/Transformers.pdf
The secondary screen is connected to that by way of bonding including the metal conduit to the mains filter boxes.
The clean ground is connected to a dedicated good earth ground.
there is no connection between secondary and primary but the magnetic path.
PE only connects to primary screen. (its the dirty ground return.)
link http://surflibrary.org/ses/Tempest/Tempestpapers/Transformers.pdf
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It cannot be an anchor in the ground. That would increase the risk of lightning strike damage/injury.
One must use the electricity providers EARTH to protect against lightning strike.
Otherwise one could have thousands of volts between the personal EARTH and the mains EARTH. I would not like to be handling two components connected to different earths. And worse you would not need to touch both components, if the voltage difference is high enough the spark can jump.
anchor of your measurements
for simplicity I would specify the same earth ground at the buildings service entrance. use a metal conduit and a heavy gauge wire or better yet flat braided cable.
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