Isolation transformer wiring question

[cincin]

I just bought a 15A used isolation transformer, which I plan to use to isolate the devices under test while using my oscilloscope.
The Ground wire goes straight from the North-American 3 prong input plug to the Ground on the 3 prong outlet on the secondary side, which I'm reading is fine and may come in useful.

I've confirmed that the Live and Neutral on the primary side are isolated from the Live and Neutral on the secondary side.
I've also confirmed that the secondary side outputs 120V when plugged into the wall (120V).

The problem is: I measure 31.5V between the Live wire of the secondary and the shared Ground, and 71V between the Neutral wire of the secondary side and the shared Ground, and I'm not sure I understand why.

My understanding is that there should be no potential between the secondary and the ground.
How is this possible?

Thanks!

[jonpaul]

Wirign is correct but a schematic or sketch is better to understand.

The voltage you see is typical for stray capacitance Pri-Sec.

Place a slight load across the meter (47 k Ohm 2W ) it will go way down.

Read up on transformer parasitic capacitances.

Jon