- #1
Evil Bunny
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When I put an o-scope probe into my (120VAC) wall socket, with no ground (reference) attached, just a single wire, I get a perfect 60 Hz sine wave, with about 35Vrms magnitude.
When I plug the o-scope probe into the socket with the ground attached appropriately to the return of the same socket, I get the 120V 60Hz sine wave as expected.
Why do I get the perfect sine wave (with the smaller magnitude) with no reference attached? Is it capacitive coupling?
The reason I ask this is because I was chasing down a signal today at work on some equipment and was receiving this signal (unexpectedly) off of a circuit with a known open conductor... This got me to thinking about why.
Hope that made sense.
When I plug the o-scope probe into the socket with the ground attached appropriately to the return of the same socket, I get the 120V 60Hz sine wave as expected.
Why do I get the perfect sine wave (with the smaller magnitude) with no reference attached? Is it capacitive coupling?
The reason I ask this is because I was chasing down a signal today at work on some equipment and was receiving this signal (unexpectedly) off of a circuit with a known open conductor... This got me to thinking about why.
Hope that made sense.