The ZTVX-12-18 is a 2 x 12 blocking switch matrix covering DC to 18 GHz with low insertion loss and high isolation. The 2U height, 19-inch rack-mountable chassis includes all RF connections on the front panel. It is well suited for expanding a standard 2-port VNA for multi-port or multi-device testing. It provides parallel testing of multiple 2-port devices in applications such as filter or amplifier characterization and production testing of splitters, combiners, or switch components with high port counts, as well as MIMO systems testing. The system can be controlled via USB or Ethernet, and software support includes a Windows GUI and API with programming instructions for Windows and Linux.