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This paper is devoted to illustrate the setting up of a RFbased streak Camera (RFC). Beam deflection was accomplished by replacing the standard deflecting plates of a conventional streak camera (SC) by a RF cavity located just after the accelerating optics. The magnetic field in the cavity imparts a transverse force to incoming electrons, whose direction depends on the time at which each individual electron enters the cavity, i.e. on the RF-phase experienced by an incoming electron (circular scanning) [1]. The high sweep speed, which is possible by the method, envisaged sub-ps resolution [2]. The other components of a streak camera keep unchanged. The circular deflection of an electron beam can be performed by transverse magnetic field of TM110 mode with circular polarization in a cylindrical cavity. Circular polarization is provided by exciting two orthogonal modes shifted by Œ/2 rad in phase. A complete treatment on theoretical basis for the RFC can be found in Ref. [3].