OverviewOne of the characteristics specifying the performance of m accelerator cell as if relates to the electron beam, is the Wakefield impedance [I]. The real part of the transverse wakefield impedance relates to offsets of the beam 3s it travels through the accelerator cell. To verify that the cell operates as expected, and that simulations and design predictions of the cell are within acceptable parameters (before building more cells) it is desirable to measure the wakefield impedance using the traditional two-wire technique [?, 3, 41. This technique benefits from its reproducibility and physical simplicity but is complicated by the need to fabricate a test fixture. But once the tixture is fabricated, it is simple to measure any number of accelerator cells. The following is a description of the two-wire mensurement technique as performed at Lawrence Berkeley Lab (LBL) on a prototype DARHT accelerator cell.