Generating a Circle and Half Sun Pattern on CRO Oscilloscope Without Memory Devices

To generate a circle and a half sun pattern on a cathode ray oscilloscope (CRO) without using memory devices, the scope must be set to XY mode, which plots the voltage of channel one against channel two. Producing a circle requires applying sinusoidal signals to both channels with a 90-degree phase shift between them, creating Lissajous figures. The half sun pattern can be derived by modifying these signals accordingly. Such visual patterns are primarily used for quick visual comparison of input signals, harmonic analysis, and can represent IV curves, gain analysis, or hysteresis curves. While practical applications include control systems and robotics involving XY and sometimes Z control, these patterns are often considered more of an analytical or educational tool rather than a direct application in modern electronics.
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