Dear Ernst.
Please find attached a possible explanation into the effect I was seeing.
Quote from user member Smudge at OUR.
" Here is my take on Grum's experiment. The isolated SG plus scope plus UPS have significant self capacitance to ground, and since the SG connects to ground it is driving current through that capacitance. It is not driving current into the ground rod. Self capacitance is a queer thing, it exists even when the device is far away from the ground that we know as earth. Its "ground" point is really just a zero potential point. The current I show in the first image below is not going into our earth ground, it is just going into space as Maxwell's displacement current to charge and discharge the self capacitance, or put another way to create the alternating electric field emanating from the scope, SG and UPS chassis as their potentials change relative to ground. That first image is for low frequencies where it is clear that both scope channels see the same voltage. The second image includes the inductance of the wire connecting the SG to ground where it becomes clear that the scope channels now see different voltages. The distant earth rod is not responsible for this effect, as would be evident if the second scope channel were connected to the near earth rod.
Smudge "
Un quote.
In their opinion it is simply a HF tank circuit that I was getting close to it's resonant point.
Kind regards, Grum.
Please find attached a possible explanation into the effect I was seeing.
Quote from user member Smudge at OUR.
" Here is my take on Grum's experiment. The isolated SG plus scope plus UPS have significant self capacitance to ground, and since the SG connects to ground it is driving current through that capacitance. It is not driving current into the ground rod. Self capacitance is a queer thing, it exists even when the device is far away from the ground that we know as earth. Its "ground" point is really just a zero potential point. The current I show in the first image below is not going into our earth ground, it is just going into space as Maxwell's displacement current to charge and discharge the self capacitance, or put another way to create the alternating electric field emanating from the scope, SG and UPS chassis as their potentials change relative to ground. That first image is for low frequencies where it is clear that both scope channels see the same voltage. The second image includes the inductance of the wire connecting the SG to ground where it becomes clear that the scope channels now see different voltages. The distant earth rod is not responsible for this effect, as would be evident if the second scope channel were connected to the near earth rod.
Smudge "
Un quote.
In their opinion it is simply a HF tank circuit that I was getting close to it's resonant point.
Kind regards, Grum.
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