Okay, just found a 125VAC connection in the set (feeds the front panel lights). I measured with my DMM and got 117.8VAC. I then set my scope to AC coupling, 50V/Div and probe in 10x so I should see a waveform taking up roughly 2.3 divisions as the AC is 117VAC. I'm attaching a picture of what I got and you can see the settings on the scope. I'm no expert, but I don't think 117VAC should take up 6.5 division for a voltage of roughly 325V.

Am I wrong? Is this a problem with the scope, the probe or (hopefully) user error?

...

Did you see my post about RMS voltage?

Must have missed it. Just went back and found it. I think I get it now. For RMS voltage you don't use PP, just one P and then the square root of 2 (1.41421356237).

So I now know it's measuring AC voltage correctly. Time to test the other voltages around the H-Pulse to see if they're within range.

Thanks for being patient with me while I learn.

One note on RMS it only has that mathematical correspondence to peak voltage with a basic sine wave like what you get from an outlet. Any other wave form will have a different mathematical correspondence and the more complex the wave form the more complex the math...