Abstract: A pulse-generating apparatus, comprising a pulse source, an output terminal to which pulses from the pulse source are supplied, and a measuring device for measuring the level of a pulse that will be output from the output terminal at a pre-determined time position; a pulse-generating apparatus, further comprising a device for adjusting the level of the pulse that will be output at the pre-determined time position, based on at least the measured pulse level and the reference pulse level at the pre-determined time position; and a pulse-generating apparatus, wherein the pulse source generates pulses based on at least one parameter, and the adjusting device adjusts the level of the pulse that will be output by updating the parameter, changing the amount of amplification of the amplifier of the pulse source, or changing the amount of attenuation of the attenuator of the pulse source. The parameter may include at least one of the load impedance and the pulse level.