Advantech ADAM-5511 Manual page 327

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Have you ever tried to measure the voltage between a live circuit and a
concrete floor? How about the voltage between neutral and a concrete
floor? You will get nonsense values. 'Hot' and 'Neutral' are just
relational signals: you will get 110VAC or 220VAC by measuring these
signals. Normal mode and common mode just show you that the Frame
Ground is the most important reference signal for all the systems and
equipments.

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