I know that the subject was already discussed but my English is not very good and I lost myself a little in all this discussion.
A member on this forum had posted this bond Internet http://www.cromwell-intl.com/radio/probes.html to build probes 10x. I did not build myself these probes but I had the idea to connect in series 2 resistors of 3.3M and 2.2M (for a total of 5.5M) to each one as of the my probes (white and black). I have to connect to input of my resistor a cable directly connected to my faceplate of 120V AC, and I connected my probes (white and black) to the exit of my resistors to input of Nano. Here what I obtained(see attachment).
Is what all that is correct? Is what I can better do? Is what I can also connect this assembly on 220V AC?
If I understood well, when I am connected on the 120V, one should not be connected at the same time on the USB port!
When I touch the aluminum case of Nano, there is a light rise in the voltage. Why?
When I bought my Nano, I believed that I was limited to connect 40V maximum. I am quite happy of my purchase when I note now that I can connect until 400V according to information given by BenF here download/file.php?id=457
Surprising this small Nano!
Thank you with all for your assistance!