4 ms·
I wonder whether this is specific to laptops (running from battery or otherwise not grounded) or if it also works with properly grounded desktop computers. My
by dfox 13y ago
I wonder whether this is specific to laptops (running from battery or otherwise not grounded) or if it also works with properly grounded desktop computers.
My HP notebook from ~2000 had measurable (although very high impedance) 110V AC between exposed metal parts and PE in wall outlet when connected to charger. Modern thinkpads (and probably all non-Apple laptops sold in Europe) does not seem to have this problem as ground is connected through in charger, not only AC coupled to both hot and neutral.
- dfox 13y agoI have been finally able to download and read their full paper and it seems to answer this question: they observe that grounding thru AC charger does increase SNR of measured signal.
- pilsetnieks 13y agoMacbooks can be grounded, too. The round metal thing that's holding the plug in place also serves as a connection for ground. It is moot if you're using the small plug which doesn't have ground but if you connect the cable instead of the plug, or use a UK plug, the computer is properly grounded.
- deleted 13y ago[deleted]