2PAC Mafia
Member
Hi,
I have a Tenma 72-8395 Scope at workshop. When I bought it, repairing some marine battery chargers I had problems tripping the earth leakage protection from the main electrical panel.
I found that the earth pin at 220Vac input plug is directly connected to output ground so when I tried to measure values at Vac I made a derivation to ground.
Finally I modified a cable to use only 220Vac without ground (only hot and neutral). The other day I felt small current at my skin touching a little bit the output ground, if I catch the ground connection I don´t feel anything but if I just touch it with a tiny part of my skin you fell something. Why?
I measured the ground output against 220Vac plug and to one point I get 217V, to the other 8V, but the earth cable is not connected to the scope...
I have a Tenma 72-8395 Scope at workshop. When I bought it, repairing some marine battery chargers I had problems tripping the earth leakage protection from the main electrical panel.
I found that the earth pin at 220Vac input plug is directly connected to output ground so when I tried to measure values at Vac I made a derivation to ground.
Finally I modified a cable to use only 220Vac without ground (only hot and neutral). The other day I felt small current at my skin touching a little bit the output ground, if I catch the ground connection I don´t feel anything but if I just touch it with a tiny part of my skin you fell something. Why?
I measured the ground output against 220Vac plug and to one point I get 217V, to the other 8V, but the earth cable is not connected to the scope...