I noticed I got a zap from my Oscilloscope and from my serial terminal whenever I touched bare metal on them. Both of these pieces of equipment are quite old.
Here is where I feel very stupid... I used a cheater two prong to three prong converter (I live in the USA) that was not polarised. I plugged my bench power strip into this. It very well could have been upside down
I threw it out and replaced the two pronged outlet with a three pronged outlet, however because this house was wired in the 1950s there is no ground wire for the third prong, but at least I know hot is hot and neutral is neutral.
After doing this I took my multimeter and stuck one probe to the neutral side of the outlet and the other probe to the metal case of the oscope and still I measured around 55 to 60 volts!!! I also measured the same amount of voltage on my serial terminal as well!
So then I took the oscope to a three pronged outlet that I know for sure was grounded properly (my father wired it himself when he installed the wall) and I did not read any voltage from the case.
What is weird is that I never used to get a shock from anything until recently, perhaps before I wasn't grounded enough to get one?
I guess the proper thing to do is to give my outlet a proper earth ground, but even without one I don't think I should be getting shocks from my equipment if it is plugged in the right way! (Hot to Hot and Neutral to Neutral).
Do you think when both pieces of equipment were plugged in upside down that may have broke something which would result in shocks
I really don't want to have to throw out my oscilloscope or my terminal!
Here is where I feel very stupid... I used a cheater two prong to three prong converter (I live in the USA) that was not polarised. I plugged my bench power strip into this. It very well could have been upside down
I threw it out and replaced the two pronged outlet with a three pronged outlet, however because this house was wired in the 1950s there is no ground wire for the third prong, but at least I know hot is hot and neutral is neutral.
After doing this I took my multimeter and stuck one probe to the neutral side of the outlet and the other probe to the metal case of the oscope and still I measured around 55 to 60 volts!!! I also measured the same amount of voltage on my serial terminal as well!
So then I took the oscope to a three pronged outlet that I know for sure was grounded properly (my father wired it himself when he installed the wall) and I did not read any voltage from the case.
What is weird is that I never used to get a shock from anything until recently, perhaps before I wasn't grounded enough to get one?
I guess the proper thing to do is to give my outlet a proper earth ground, but even without one I don't think I should be getting shocks from my equipment if it is plugged in the right way! (Hot to Hot and Neutral to Neutral).
Do you think when both pieces of equipment were plugged in upside down that may have broke something which would result in shocks
I really don't want to have to throw out my oscilloscope or my terminal!