The 5860V and 5861V Waveform Monitors offer quick and accurate monitoring of amplitude, time and frequency response characteristics of composite TV signals. The waveform monitor is equipped with sweep modes and trigger functions that are optimized for monitoring video signals. For example, sweep modes 2H, 1H, 1μs/div, 2V, 1V, and 2V MAG can be selected for the horizontal axis. Optimized filters such as FLAT, IRE (5860V), LUM (5861V), CHROMA, DIF GAIN and DIF'D STEP can be switched in to observe various characteristics of video signals. Furthermore, a line selector is provided for observing VITS and VIR signals that are inserted during the vertical blanking period. The blanking output connector allows for blanking other periods than the lines selected by the line selector. Loop-through connectors are provided for A and B and external reference inputs. A video output follows the selected A or B input. Other functions necessary for video signal monitoring are provided.