Define difference between recurrent sweep and triggered sweep
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There are two important sweep generator requirements.
The sweep must be linear (the sweep voltage must rise linearly to the maximum value required for full screen horizontal deflection of the spot).
The spot must move in one direction only, i.e. from left to right only, else the signal will be traced backwards during the return sweep. This means that the sweep voltage must drop suddenly after reaching its maximum These requirements call for a sweep voltage having a linear sawtooth waveform,
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