Electronics > Beginners

450 volts on internet coax line!

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testtube44:
Why does my oscilloscope measure 400+ AC volts on my internet coax line? Yet I short it to ground and it doesn't arc over or anything? I was scared shitless to touch it, what is causing this?

testtube44:
I'm afraid that if I touch it I will die. What is this? EDIT: its mains at 60 hz, not RF

soldar:
What happens if you connect a resistor of say 100K or 200K? Still same voltage?

StillTrying:
Going by your other posts I'd have to ask what you're connecting the scope's GND clip to!

stj:
it could be capacitive coupling to a powerline in the street because of shit earthing at the cable mux gear,
put a multimeter across the coax.
btw, is this solid, or oscillating at a fixed frequency?

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