The usual method of synchronization uses a portion of the input signal to trigger a sweep generator, making the moored or sweep signal synchronized to the input signal. Using a portion of the same signal to be viewed, to provide the synchronization signal, the synchronization is guaranteed. Thus, it is possible that a trigger signal can be obtained from a single channel display signal source trigger can be obtained from the power grid (60 Hz) for display of signs relating to the network of an external signal (other than the signal to be mark) or, most likely, of a signal extracted from the input vertical. The selector switch in the oscilloscope being in the INTERNAL position provides part of the input signal to the trigger generator circuit. The generator output firing a trigger signal is used to start the main sweep of the oscilloscope, whose duration is set by the time setting/cm. Thus, the shooting starts at various points of a cycle signal.
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