Oscilloscope Trigger Or Synchronous Scanning

Trigger or sync scan
Slowly adjust the trigger level (or synchronization) knob to display a stable waveform on the screen. Adjust the level knob appropriately according to observation needs to display the waveform at the corresponding starting position.
If a dual trace oscilloscope is used to observe the waveform and perform a single trace display, the display mode switch is set to YA or YB. The measured signal is input into the oscilloscope through the YA or YB input terminal. Select the "internal trigger pull YB" switch for the trigger source of the Y-axis and set it to the "press" (normal) position. If the oscilloscope performs two trace display, the display mode switch is placed in an alternate position (applicable to signals with a low observation frequency) or an intermittent position (applicable to signals with a low observation frequency), then the trigger source for the Y-axis is selected as "internal trigger pull YB" and the switch is placed in the "pull YB" position.
Abnormal phenomena caused by improper use
During the use of an oscilloscope, abnormal phenomena may occur due to improper adjustment due to the operator's lack of understanding of the oscilloscope principle and familiarity with the function of the oscilloscope panel control device.