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An oscilloscope is powered from 230V mains having a nominal frequency of nearly 50Hz. The triggering mode of the oscilloscope is set to LINE. A square wave from a function generator is fed to the Y input and a stable display (properly triggered) is obtained when the frequency of the function generator is 297Hz. The actual frequency of the power supply is

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An oscilloscope is powered from 230V mains having a nominal frequency of nearly 50Hz. The triggering mode of the oscilloscope is set to LINE. A square wave from a function generator is fed to the Y input and a stable display (properly triggered) is obtained when the frequency of the function generator is 297Hz. The actual frequency of the power supply is



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