Just a word of caution. Neutral may not be at ground potential at your location and if your scope's case is grounded then high currents could flow.Originally posted by nomurphy@Aug 9 2005, 04:53 PM
Please don't connect your probe directly to the AC line, you could easily blow your probe or the input stage to your scope. Using a step-down transformer is best, but barring that, attach a 470K (top/hot) and 22K (bottom/neutral) in series and **CAREFULLY** (one handed) measure across the 22K to neutral.
And, as noted before, your scope should be plugged into the same AC source and properly polarized (hopefully three-pronged AC cord with ground).
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by Luke James