The Agilent 85130C 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 3.5mm to type-N (male) adapter and a 3.5mm to type-N (female) adapter. The frequency range for these adapters is DC to 18 GHz with a return loss of 28 dB or better.