The 8515A S-Parameter test set is available for the 8510 series network analyzer for broadband coaxial measurements from 45 MHz to 26.5 GHz. The 8515A test set has an architecture that develops a separate reference channel for each incident port. RF switching is done with a built-in electronic switch. For active device measurements, the test set includes the ability to apply dc bias (external) to the test port center conductors.