Has anybody tried putting a many-stage RC ladder voltage divider down
the center of the secondary? The E field is uniform (vertical) there,
and there's probably not much space charge. I keep thinking about it,
but I haven't tried it yet. Maybe a string of 20 M Allen-Bradley 2W
resistors with some HV ceramic caps in parallel. The time constant
should be at least 10 times the time of one cycle, 10pF or so.
It could be that due to the well-behaved field inside the secondary,
that we could dispense with the capacitors and use a long CuSO4
resistor. Be sure to use copper end plugs and measure it often, since
chemistry enters into the equation.
It's easier to measure the voltage of a Marx, since the output impedance
is quite low. Usually some sort of geometrically-calibratable
capacitive divider is used.
--- Carl
On 2/27/2018 6:27 AM, jimlux wrote:
On 2/26/18 8:42 PM, Bert Hickman wrote:
Chris,
It's a very challenging design problem. And, the divider will be
quite sensitive to changes in the surrounding E-field. Since TC
sparks create shifting space charge regions with corresponding
fluctuating E-fields in the surrounding air, accurate direct
measurements can be done only if the Tesla coil is not actively
creating streamers/leaders.
you might look at commercial products made from this:
Not a lot of design info, but
http://www.rossengineeringcorp.com/products/measurement/hv-voltage-dividers.html
is an example.
I'm sure there's stuff out there about designing a divider to work
with the output of a Marx at megavolt levels - way above what a TC
will put out.
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