What test is used to generate a signal that sweeps across different frequencies?

The correct answer focuses on the specific function of a test designed to analyze how well a system responds to different frequencies. A signal sweep test is used to generate a signal that varies across a range of frequencies, which allows technicians to observe how the equipment handles these changes. This test is essential for evaluating the frequency response of audio and video systems, ensuring that they perform as expected across the audio spectrum.

In contrast, while a frequency response test is closely related, it generally refers to the assessment of an audio system's output across various frequencies, rather than the act of generating a sweeping signal. The light balance test and connection integrity test do not pertain to frequency sweeping at all; the former assesses illumination consistency, and the latter evaluates the physical connections within a system. Thus, the signal sweep test is uniquely suited to the question's criteria.