Keyswitch time base
It is the control that allows you to vary the length of horizontal displacement of the point on the screen. Through this control can reduce or enlarge the picture horizontally on the screen projected on it. In some oscilloscopes this selector switch has a position identified as EXT (external) which enables the horizontal displacement can be controlled by externom circuit to the oscilloscope through a specific input. When the selected external position is no formation of the trace on the screen, obtaining just a point.
Is the adjustment that allows controlling horizontally the waveform onscreen. Turning the horizontal position to the right dash moves horizontally to the right and vice versa. As the vertical position control, the control does not interfere with the horizontal shape of the figure projected on the screen.
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