The 11531A Test Unit Plug-In facilitates 8690B Sweep Oscillator calibration. The unit plugs into the 8690B like an RF unit. Calibaration voltages for sweep range amplitude and end points (all sweep modes) as well as marker calibration, BWO calibration, Blanking and Pen lift are sampled and made available at the 11531A front panel output for fast, accurate calibration.