Using the MIL-C-38999 test fixture and an S-parameter test set to measure the transfer impedance of a new universal ground adapter

In the course of developing a shield ground adapter (SGA), two deficiencies were found: existing technology ground adapters require shipyards to stock large numbers of ground adapters of different sizes and style, and the frequency range of the test fixture is limited. NUSC has developed a ground adapter that works equally well with different cables, conduits, and stuffing tubes in a wide range of different size combinations. In conjunction with this development the modified MIL-C-3899 triaxial test fixture has been combined with a network analyzer S-parameter test set to extend the usable frequency range and sensitivity of the test method to one GHz. An added benefit of the UGA (universal ground adapter) is the ability to connect various sizes of conduits from various vendors to ground using a minimum number of stocked parts. The new transfer impedance test method developed along with the UGA effort will be used to verify the EMP (electromagnetic pulse) performance of Navy shipboard conduits and fittings