A microwave and millimeter-wave electric-field mapping system based on electro-optic sampling has been developed using micromachined Gallium Arsenide crystals mounted on gradient index lenses and single-mode optical fibers. Each light source includes a supporting strip and at least one light-emitting member provided with the supporting strip. Said arc of light is displayed using a first optical filter and a second optical filter superimposed on one another and backlighted, at least one of which being controlled in angular position about the centre of the dial as a function of the cruise speed set. In addition, the SSVD further comprises an anode and a grid that is positioned between the anode and cathode. The signal lines and the power lines respectively are covered with an insulating layer.