Here's what I have noticed so far:
- The TF101 was shipped with a different charger. On that one I have a set of plugs to match different sockets (sort of a travel adapter).
- I live in Switzerland, ungrounded connectors look a bit like this <- -> and can be used rotated. Connectors with PE look more like this <-.->, and cannot be rotated.
- In any test I used the docking, and tried with two identical power supplies
- The TF101 charger showed this effect from day one, but only in one orientation. Use it the other way round, problem gone.
- The TF30x charger shows this effect, but in both charger orientations, and slightly less noticeable
- The TF701 charger shows the same effect as with the TF30x
Let's swap chargers. (The cables are different, the chargers themselves, which generally are no more than 5V/15V CV, which switch from 5V to 15V when a tablet is detected are interchangeable).
This showed the effect is clearly caused by the chargers. It's safe to say there's different circuitry inside the different charger revisions.
My conclusion: If you want to get rid of this effect, try finding one of the old international chargers and use it with your TF701 cable.
What may work: Try an isolation transformer
Also worth a try: Aftermarket chargers
---------- Post added at 12:34 PM ---------- Previous post was at 12:17 PM ----------
I'm pretty sure this is called 'stray voltage', but not a problem.
as i can not post links, try this:
search google for 'noteboook tingle sensation', click the dell community link
also, wikipedia has an article about stray voltage (warning: technical)