ECN Forum Forums Technical Discussion Electrical Theory and Applications Floating Ground - device being tested or scope?

In your friend's case, he's probably looking at a floating system with ground detection on it. The ground detector forces a high impedance ground reference at the center point. In your case, I wonder if they haven't built in a high megohm resistance between their Neutral and case ground. Or some TVS leakage or capacitive coupling between Neutral and Ground. You don't want the two to add up.
Joe