In a plasma application (Helium or Argon Plasma), we would like to measure the current. The voltage is around 10kV AC and modulated with a function generator.
Currently we only have one of those rings that you put around the cable, but I read that those only work for high-ish amperage >1A. While using this device, we get an output of around 12mV peak to peak, put I think that this is very inaccurate.
Is there any cheap way (we are students) of measuring the current more precisely? Preferably without killing equipment and/or operators :)
For a low voltage circuit I would use a high accuracy resistor and measure the voltage drop across, but I think that this is too dangerous in such high-voltage applications.