Oscilloscope measurements in power electronics(transistor converters)very often require a galvanic separation of the oscilloscope ground from the mains supply.However the simple isolating supplying transformer(50 Hz or 60 Hz)is not sufficient because of its high parasitic capacitance between the primary and secondary side(often several nF).In many cases(when measuring waveforms with high dv/dt slope)this capacitance causes unacceptably high parasitic current pulses and ringing,influencing not only the measurement results but also the measured inverter with a risk of its damage.
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