A really nice example. I tracked the data acquisition and fit an ordinary charging curve. For anyone interested, a 25 line script w/ data is here: https://pastebin.com/R0b1XSV0
Some insights:
- The peak DC voltage seems to be around 1.15 kV.
- The time constant is around 440 s. If you were to assume a simple RC-circuit with a constant voltage source (which it probably isnt), you would end at around 100 Ohm for the resistor.
- The start of the charging curve is not at the same time as in the video indicating that some voltage was already present from experiments before the video
Also, I am pretty sure it is not inductive coupling but capacitive because of several reasons:
- It doesn't look like a coax cable but more like an ordinary thick wire.
- I am pretty sure he didn't ground the cable at the far end and thus did not create a loop necessary for induction. And if he were, inductive coupling with ground in between would result in a very large voltage drop
- If it were inductive: A single loop covering that little area would need way more turns than just one.
Some insights:
- The peak DC voltage seems to be around 1.15 kV.
- The time constant is around 440 s. If you were to assume a simple RC-circuit with a constant voltage source (which it probably isnt), you would end at around 100 Ohm for the resistor.
- The start of the charging curve is not at the same time as in the video indicating that some voltage was already present from experiments before the video
Also, I am pretty sure it is not inductive coupling but capacitive because of several reasons:
- It doesn't look like a coax cable but more like an ordinary thick wire.
- I am pretty sure he didn't ground the cable at the far end and thus did not create a loop necessary for induction. And if he were, inductive coupling with ground in between would result in a very large voltage drop - If it were inductive: A single loop covering that little area would need way more turns than just one.