(SNIP)
Now, 250 volts are not really 'high voltage', but compared to my standard lab supplies it feels like that.
Here, stick out your tongue... ![Laughing :-DD](https://www.eevblog.com/forum/Smileys/default/smiley_laughing.gif)
I always wondered if the tongue would show the ripple, when a non-battery voltage is applied!
Maybe the one who tries would turn into a Zungenfrequezmesser?
In all seriousness, I had a coworker at one job who would use two fingertips to test for live AC voltage in appliance he was working on.
![Face Palm :palm:](https://www.eevblog.com/forum/Smileys/default/facepalm.gif)
As for "stick out your tongue", I can confirm empirically that there is a distinct qualitative difference between DC and AC, up to the input's tolerance level.
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/wink.gif)
Now measuring ripple... hmmmm. While I am somewhat infamous for my talented tongue, I'm not sure that even I could detect such nuance, unless the ripple were considerable. Also not sure about telling the difference between pulsing DC vs AC, though I CAN tell the difference between a sine wave and saw/square wave, if the frequency is low enough.
Again, up to the input's tolerance level.
![Broken! :-BROKE](https://www.eevblog.com/forum/Smileys/default/smiliey_scope_broke.gif)
mnem
~12-18V P-P, if you were wondering.
![Laughing :-DD](https://www.eevblog.com/forum/Smileys/default/smiley_laughing.gif)