Semflex / Cinch Connectivity Solutions DKF Metric Test Cable Assemblies offer a DC to 18GHz frequency range, 50Ω impedance rating, and 500 cycles of durability. Depending on the model, DKF Cable Assemblies feature a high performance HP190S cable and strain relief boots that can handle everyday handling. Semflex DKF Metric Test Cable Assemblies have custom lengths available and are ideal for production test setups, production use, and high end test laboratories.