Normally the ground lead of a scope probe is connected to the ground of the scope and this ground is connected to the safety ground of the AC power input.? One can remove this safety ground with adapter on the AC plug and then connect the scope to the AC mains.
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Of course the safety ground is also connected to the AC mains neutral and should not be an issue, just dont connect the scope probe ground to the line/hot of the AC.
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Normally the scope probe ground is floating when the safety ground is not connected.?
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Another way to get around this is to use a battery powered scope.? I have made other measurements in circuits across components not at ground of the circuit by using battery powered scopes.
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73, ron, n9ee
