Approximate Sphere Capacitances - from WinTesla

 

Diam. in inches   pico-Farads

• 2              5.68

• 3              8.52

• 4            11.36

• 5            14.20

• 6            17.03

• 7            19.87

• 8            22.71

• 9            25.55

• 10          28.39

• 11          31.23

• 12          34.07

• 13          36.91

• 14          39.75

• The best way is to directly measure the sphere's capacitance. This can be done by getting the sphere about 6+ feet off the ground and suspended or on top of a non-conductive support. Use an LCR meter, such as a B&K 875B. Be sure to zero out the capacitance of the leads used.

• - 5-22-11

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