Selects will be taken where the sync signal to fix the image on the screen of the oscilloscope. Typically, this key has three positions, at least:
Position CH1: Timing is controlled by the signal applied to channel 1.
Network position: Performs timing based on the frequency of the power supply oscilloscope (60Hz). In this position can easily synchronize the screen in vertical input signals applied to be obtained from the power grid.
External position: In the position of figure external synchronism is obtained starting from other external equipment connected to the oscilloscope. The signal that controls the timing position is applied to the external input synchronizing.
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