Trigger Level - Teledyne LeCroy T3DSO2000A Series User Manual

Trigger Related Label
Trigger level Indicator Horizontal 0 position Horizontal 0 position (out
Indicator of screen) Indicator

15.3 Trigger Level

Both analog and digital triggers must have a correct trigger level value. The
oscilloscope judges whether a waveform satisfies the trigger condition when it crosses
the trigger level, shown in the example as a yellow dashed horizontal line. If it does,
the crossing time is the trigger position, the blue dashed vertical line. In the following
figure, the trigger condition is set as to capture a rising edge. When the signal with
positive slope crosses the trigger level, the trigger condition is satisfied and the point
the signal crosses the level is the zero trigger position. This is shown in the example
below where the blue and yellow dashed lines intersect. Note that the positions are
shown on the scope by blue and yellow triangles. The blue and yellow dashed lines are
shown here for illustration purposes only, the scope does not display these. There is
also a zero voltage level marker shown circled in red.
In some special trigger, the system will automatically set the trigger level, such as
using AC Line as the trigger source.
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T3DSO2000A Manual. Page 53