What is the primary function of a waveform monitor?

The primary function of a waveform monitor is to measure and display the level of a video signal over time. This tool is essential in video production and broadcasting, as it provides a visual representation of the video signal’s amplitude in relation to time. By analyzing the waveform, technicians can assess the brightness levels and ensure that the video content adheres to legal broadcast standards, thus maintaining the integrity of the image. A waveform monitor allows professionals to identify issues such as clipping, noise, or other irregularities in the video signal, facilitating adjustments to achieve optimal quality in video performance. The other options do not pertain to the waveform monitor's specific capabilities; instead, they relate to different types of equipment or functionalities that do not involve measuring video signals.