Grounding with separate enclosures?

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forr

forr

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Joined 2004
scottjoplin said:
Ok, you don't want to connect 0V to chassis because PE may be noisy, fair enough. On a side note, oscilloscope 0 volts/reference is usually connected to PE, why is that done?
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Safety.
But there exist safe scopes with floating inputs which just allow to avoid the connection to earth.

EDIT
Have you noticed that scopes do not have a star ground scheme ? Why is that done ?
 
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