The analog oscilloscope is turned on, and the brightness and focal length are moderate. The horizontal working mode is set to automatic, and the horizontal displacement is set to center. The vertical working mode is set to Y 1, and the vertical displacement is centered. At this time, there will be clear scan lines;

To measure the waveform correctly, first connect the input signal to the oscilloscope, at least let the amplitude be greater than one grid, select the internal trigger and the signal channel to be triggered, and adjust the synchronization LEVEL, so that synchronization can generally be achieved (the synchronization indicator light will be on). At this point, you can adjust the scanning speed to see the measured waveform clearly.