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Safety Earth (SE) / Dirty Earth / Protective Earth / Electrical Earth / Power Earth
Instrument Earth (IE) / Electronic Earth / Reference Earth / Clean Earth / Signal Earth
Intrinsic Safety (IS) Earth for IS circuit. This is only required when you have IS instruments
The primary aim of the instrument earth/signal earth is to provide a low impedance path to the noise currents induced by RFI/EMI, which may result in the induction of faulty unwanted noise signals into the analog signals.
Shields of Single pair /Multi pair analog instrument signal cables are connected to this earth (IE).