Question added: “I would like to analyse a 50% duty cycle, 100% positive offset 30 KHz waveform transmitted through coil (50cm diameter). The transmitting coil would put out about 200-300nT magnetic Field.”
The lower the number of turns the better.
(The coil needs a low inductance.)
But the lower the inductance to lower the Output Voltage.
(200-300nT is very low. The Earth static magnetic field is about 40uT and this is problematic to measure.)
Spooky2 PEMF coil has an inductance of 200uH. This comes to a blind Resistance of 37 Ohm at 30 kHz.
But this will distort the measured Waveform. Not really useful.
I assume that you need an external Pre-Amplifier (factor 1000x) for your Oscilloscope that amplify the output of the sensing coil (that may have with one or two turns).
For more details, please check the link from: