Calibration method for calibrating transient behaviour of a transmission line pulse test system comprising: - a transmission line pulse generator for generating predetermined pulses for analyzing a device under test; - probe needles for applying said predetermined pulses on the device under test; - transmission lines connecting said probe needles to said transmission line pulse generator, said transmission lines being nominally impedance matched with said transmission line pulse generator; and - measurement equipment for detecting transient behaviour of said device under test by simultaneously capturing voltage and current waveforms over said device under test as a result of said pulses, said measurement equipment being connected between said transmission lines and said transmission line pulse generator; the calibration method comprising the steps of: a) applying the transmission line pulse test system on an open and capturing first voltage and current waveforms by means of said measurement equipment, b) applying the transmission line pulse test system on a calibration element having a known finite impedance and a known transient response and capturing second voltage and current waveforms by means of said measurement equipment, c) transforming the captured first and second current and voltage waveforms to the frequency domain, d) determining calibration data for the transient behaviour of said transmission line pulse test system on the basis of said transformed first and second voltage and current waveforms, said calibration data comprising a parasitic impedance of the probe needles and a characteristic impedance, transmission loss and attenuation of said transmission lines. - a transmission line pulse generator for generating predetermined pulses for analyzing a device under test; - probe needles for applying said predetermined pulses on the device under test; - transmission lines connecting said probe needles to said transmission line pulse generator, said transmission lines being nominally impedance matched with said transmission line pulse generator; and - measurement equipment for detecting transient behaviour of said device under test by simultaneously capturing voltage and current waveforms over said device under test as a result of said pulses, said measurement equipment being connected between said transmission lines and said transmission line pulse generator; a) applying the transmission line pulse test system on an open and capturing first voltage and current waveforms by means of said measurement equipment, b) applying the transmission line pulse test system on a calibration element having a known finite impedance and a known transient response and capturing second voltage and current waveforms by means of said measurement equipment, c) transforming the captured first and second current and voltage waveforms to the frequency domain, d) determining calibration data for the transient behaviour of said transmission line pulse test system on the basis of said transformed first and second voltage and current waveforms, said calibration data comprising a parasitic impedance of the probe needles and a characteristic impedance, transmission loss and attenuation of said transmission lines.