The 610D Sweep Generator Mainframe provides the frequency range is 100kHz to 40GHz (dependent on plug-in used). Features Start-Stop sweep from F1 to F2 both independently adjustable over full range; Delta F sweep width adjustable width , 0 to 10% of band (10% accuracy); CW Operation (F1, F2, or variable marker settings). Remote sweep which permits sweeping with external voltage or programming sweep Delta F and center frequency with external resistors or voltages. Sweep time is continuously adjustable in four decade ranges; 0.01 to 100 sweeps/S. Sweep modes: Auto, Line synchronous, Manual, or Triggered. 1 V/GHz output reference voltage. Unit comes with sweeper plug-in: either the 6130D (12.4 to 18.5GHz) or the 6131D (10.0 to 15.5GHz), both plug-ins provide a power output of 10 mW (+10 dBm) and has internal leveling.