The E8257DS02, S03, S05, S06, S08, S10, S12, and S15 are Millimeter-wave Source Modules that are manufactured by Oleson Microwave Labs (OML) and is provided as an ordering convenience by Keysight Technologies. The millimeter-wave source modules are designed to work with the E8247C, E8257C, E8257D, E8267C or E8267D PSG Series Synthesized Sources.