I need to measure a magnetic field of Frequency of around 130KHz in all 3 X,Y,Z axis. I have a plan to make 3 coils perpendicular to each other and measure voltages from each coil in Oscilloscope channel. As per Faraday's law of induction. I could measure (dB/dt) as follows. V = - N A (dB/dt) But I am sure it's not that easy with AC 130KHz signal So followings are my confusions: How to select measuring coil wire thickness(Thick/Thin)? How to avoid skin effect, capacitance? How to measure/calculate effective impedance, Inductance of the coil and oscilloscope probe? Which type of connecting wire Coaxial or twisted wire need to use from coil to oscilloscope probe? What should be the setting in Oscilloscope input channel 50Ω Dc, Ac or 1MΩ ? Please suggest how to proceed with it. I would be really grateful for your valuable suggestions.