Original poster: "resonance" <resonance@xxxxxxxxxxxx>The easiest and most accurate way is to measure it. Measure the RF resonant freq of the sec coil and measure it's inductance. From this, and the resonant freq equation, just plug in your two measurements and solve for C. Very accurate.
Dr. Resonance
I have a Tesla transformer with a single turn primary wound on a cylindrical former and the secondary turns (30 turns) are wound on conical former, with the high voltage end being at the smaller radius of the cone. The secondary winding is inside primary winding. I want to calculate the inter-turn capacitance of the secondary windings, or the capacitance between any two turn on the secondary. Is there any formulae for such case, please help me. Regards Partha