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The primary function of the sweep amplifier is to drive the CRT (Cathode Ray Tube) deflection coils. In oscilloscopes and other devices that utilize CRT technology, the sweep amplifier generates linear voltage signals that control the horizontal and vertical movement of the electron beam inside the CRT. This movement is essential for tracing waveforms and displaying signals on the screen, making the sweep amplifier a crucial component in the operation of devices that rely on displays to visualize electrical signals.

The sweep amplifier ensures that the beam moves at the correct rate and direction to accurately represent the input signal over time. By controlling the deflection of the electron beam, it ultimately enables the user to clearly see and analyze waveforms, which is critical in many applications ranging from electronic testing to telecommunications.

While there are other functions mentioned, such as increasing the power of video amplifiers or driving resolver coils, these are not the primary functions associated with a sweep amplifier's role in controlling the movement of the electron beam in CRT displays.