The Keysight 85130H test port adapter is designed to protect the test set port when it would be directly connected to the device under test. These adapters have a special rugged female connector designed for connecting to the network analyzer test port. This special connector will not mate with a standard male connector, but converts the rugged test set port to a connection that can be mated with the device under test. The set contains a 1.85 mm to 1.85 mm male adapter and a 1.85 mm to 1.85 mm female adapter. The frequency range for these adapters is dc to 67 GHz with a return loss of 23 dB or better.