Greg,
Please do the L-L Scope verification.
There should be a Zero Crossing, as this is still a 2 Wire Single Phase Circuit, even if the Source is a Wye Configuration.
If the results show different, I definitely want to know!
For fun, how about viewing a few Load Types, such as:
- A Pure Resistance Load,
- A Linear Load (Induction Motor Loaded to 30% to 50%),
- A Non-Linear Load, of >10% THD.
-- Scott