System for displaying evolution of one physical parameter compared with development of another physical parameter

A system for the display of time-variable physical parameters, comprising a computer, a memory connected to said computer for recording acquired values of these parameters, a regulatable frequency clock connected to means for the acquisition of the values of these parameters in order to fix at least one predetermined sampling or acquisition frequency for the values of said parameters, outputs of said acquisition means being connected to the computer, as well as display means connected to the computer, wherein said system also comprises means for simultaneously recording in the computer memory and at the same frequency and in the time acquired order, the development of the acquired values of one of these parameters compared with the development of the acquired values of the other of said parameters, the computer controlling the display means in order to obtain the image of the graph or graphs representing said development, the computer being capable of selecting the recorded values of said parameters in the memory at a predetermined selection frequency different than said predetermined sampling frequency.