The 8690B Sweep Generator Mainframe is an all solid-state version of the 8690A. Uses versatile 8690 Series plug-ins (sold separately). Provides start-stop sweep, marker sweep, and CW operation functions. Sweep modes are continuously adjustable in four decade ranges, 0.01 to 100 seconds. Two frequency markers independently adjustable over entire frequency range of 0.001 to 40GHz. Typical accuracy is 1% of full scale. Plug-ins sold seperately.