1. Method for matching an adaptive hybrid ( 15 ) to a line ( 16 ) for making a reflectogram of the line ( 16 ), characterised in that the method comprises the steps of measuring ( 1 ) an input impedance (Z meas ) of the line ( 16 ); modelling ( 2 ) a characteristic impedance of the line ( 16 ) via a physical model (Z phymod ); estimating ( 3 ) at least one parameter of the physical model (Z phymod ) via a cost function which depends on the measured input impedance (Z meas ); converting ( 30 ) the modelled characteristic impedance into at least one impedance value ( 13 ); and setting ( 31 ) the adaptive hybrid ( 15 ) with the at least one impedance value ( 13 ).