Measurement apparatus for alternating currents and voltages of physical plasmas, particularly of cold plasmas at atmospheric pressure, and plasma generator comprising such a measurement apparatus

A plasma generator comprising

• an alternating high voltage source configured for outputting an alternating high voltage with respect to a reference potential,
• a plasma electrode configured for igniting a physical plasma in a working gas by applying the alternating high voltage which causes electric discharges with respect to the reference potential,
• a high voltage line connected to the alternating high voltage source and the plasma electrode and configured for applying the alternating high voltage to the plasma electrode, and
• a measurement apparatus for alternating currents and voltages of the physical plasma, the measurement apparatus comprising
• a current transformer having a ring core and a measurement winding on the ring core, the measurement winding having two ends and a center tap,
• a cable guide configured for guiding the high voltage line in a defined relative arrangement through the ring core,
• a measurement resistor connected between the two ends of the measurement winding, wherein a first measurement alternating voltage dropping over the measurement resistor is a first strictly monotonic increasing function of an amperage of the alternating currents flowing through the high voltage line to the plasma electrode, and
• a measurement capacitance connected between the center tap of the measurement winding and a reference potential connector, wherein a second measurement voltage dropping over the measurement capacitance is a second strictly monotonic increasing function of an amplitude of the alternating high voltage applied to the plasma electrode with respect to the reference potential present at the reference potential connector.