-- YusufCan - 13 Nov 2016

# TESLA-COIL MEASUREMENTS

• First, I refurbished HV capacitors with a new salt-water mix (125gr salt in 7-litre water). In total, we have 32 capacitors.
• HV capacitors in primary circuit theoretically should have 300-400 pF and we found in measurement 385 pF, so they seem okay.
• Toroid on top of secondary coil, has a theoric value of 18 pF and measured 95pF. Theoric value calculated as D1=410mm and D2=110mm in http://deepfriedneon.com/tesla_f_calctoroid.html
• Capacitance measurements done by oscillator by connecting R in the circuit and connect oscilloscope parallel to the C and using formula: 1/2=exp(-t/RC) -> ln2 = t/RC -> t = ln2 RC, where t measured from oscilloscope.
• Inductance of primary circuit measured as 1.46 microH and secondary coil measured as 4.60 miliH.
• Both coils measured as: We create a RL circuit in series with function generator and connect oscilloscope in to connects, one is where R and L meets and the other is where R and func. generator meets. So we have two channel in oscilloscope, one measures incoming wave and other measures inducted wave. Then we try to make inducted wave to have half of the voltage value of the incoming wave and use formula: L= R/(2pi*f*sqrt(3)) where f is the value we see on oscilloscope.
• Finally frequencies of primary and secondary LC circuits calculated as: Primary 0.254 MHz and Secondary 1.19 MHz by using formula: f = 1/(2pi * sqrt(LC))
• HV capacitors measured again after connected as 16 packets. We have 2x16 HV capacitors and each bunch have 4.28nanoFarad and in total when they all connected they hace 8.6 nanoFarad which is less than expected according to their single capacitance values. *
Topic revision: r4 - 19 Nov 2016, YusufCan

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