I got a tingling feeling!
Posted 17 September 2012 - 03:07 PM
Posted 17 September 2012 - 03:16 PM
The usual suspect in this case would be a ground loop.
This occurs when various grounds are at differing potentials.
Measure between grounds on your equipment with a voltmeter. Any measurement other than zero will cause ground loops.
Ground loops are a common condition when multiple power supplies are in use. They can raise havoc with sensitive equipment. The usual fix is to put all of your stuff on a common ground.
Posted 17 September 2012 - 04:20 PM
Posted 17 September 2012 - 06:06 PM
Posted 17 September 2012 - 07:53 PM
You can optocouple or optoisolate your usb and or usb to serial connections..
Posted 18 September 2012 - 02:40 AM
It seems like every time I connect my mount to my PC, I charge up the mount! I just noticed it today when I touched it and got that tingling electricity feeling in my fingers. It goes away when I unplug the USB cable so it's either the PC or the cable that's doing it. .......
It has to be high voltage for you to feel it in your fingers! 12 volts is too low to feel. Are you running this on house power? You need to check to see if the ground is working. Be very careful!
Posted 18 September 2012 - 07:18 AM
Posted 18 September 2012 - 10:49 AM
Thanks guys, I think I solved it. I ran some more test and the leakage is coming from the USB ports on the PC. Changed over to the laptop and the problem went away! Now I just need to figure out how to fix the PC!
I assume the PC was plugged into house voltage. You need to test the plug it is connected to to see if the plug was installed correctly.
Also you can measure the voltage that went across your fingers with a Volt/Ohm meter instead of your hand. One probe to ground the other to the mount. I bet it measure more than 80 volts AC!! I worked many years as a TV repairman and would get a mild shock from badly grounded sets.
Posted 20 September 2012 - 11:25 AM
Not sure how your computer is getting energized at high voltage - virtually every computer I've ever come across has a ground lead on the power cord. If your house wiring does not have a separate ground connection at the plug (many older homes do not) you might want to update it for at least this circuit. If you are using one of those 2 wire to 3 wire adapter gadgets make sure the little tab is secured to the screw on the outlet. And make sure that the outlet is actually tied back to ground at that screw - if you open the circuit breaker for that circuit and measure the resistance from the screw to each leg of the AC outlet, one side must read zero ohms or close to it. That will be the neutral leg, which is connected to earth ground inside your service panel.
Sorry to go on and on about this....but it could develop into a dangerous situation.
Not all tingles are good
Oops....just noticed you are posting from Norway....not sure what your wiring methods are like there, but if memory serves, you are running 220V mains? Now THAT's a tingle!
Posted 20 September 2012 - 03:14 PM
Posted 20 September 2012 - 03:23 PM
Posted 20 September 2012 - 05:49 PM