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Using the Oscilloscope
The Scope Trigger Menu
Since the trigger level range is limited by the voltage values displayed
in the waveform window, the voltage window limits can be easily
determined. Turn the knob in both directions until the Level field reads
minimum and maximum voltage. These voltage values are the limits of
the waveform window. However, if the level is set at the min or max of a
window and offset for that channel is changed, the trigger level will
track that change, thereby changing the window limits.
If the trigger source channel is displayed in the waveform area of the
screen, the trigger level marker will appear on the screen as a
horizontal dashed line. The trigger level marker will move up and down
on the screen as the trigger level voltage is changed.
If the trigger source channel is not in the waveform area of the screen,
the trigger level marker will not be displayed.
If there are multiple occurrences of the trigger source waveform in the
waveform area of the screen, only the uppermost occurrence of the
trigger source waveform will display the trigger source marker.
The trigger level marker only appears when the trigger menu is
selected.
The default value for the Level field is 1.620 V (TTL preset value).