Abstract: A test interface between cable testing apparatus and a coaxial cable for testing the coaxial cable over a frequency range of interest. The test interface comprises a coupler having a cable lead-in opening at a first end and a threaded, connector contact portion near a second end, an insert that abuts an interior shoulder of the coupler proximate the connector contact portion, the insert having a wall portion that projects outwardly toward the second end of the coupler, and a pin constructed and arranged to abut a center conductor of the coaxial cable, the pin substantially centrally positioned within the outwardly projecting wall portion of the insert. The coupler, insert, and pin mechanically and electrically interconnect with a mating electrical connector to provide a reusable electrical connection between the cable testing apparatus and the coaxial cable.