Note
The Oscilloscope uses hysteresis to reduce false triggering due to noise or jitter in the signal. The hysteresis is 25% of Volts/div. By increasing Volts/div, you increase the value of hysteresis, which in turn stabilizes the signal in the display window. However, when hysteresis is too high, the Oscilloscope may never be triggered. Adjust Volts/div until you get a stable signal on the display.