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Trigger level is threshold voltage value the exceeding of which leads to a registration trigger signal forming in digital oscilloscopes.
Trigger level is a registrable parameter and set in voltage value, V. Trigger level is displayed as a horizontal line. In the majority of scope models this trigger level horizontal line is replaced by a short arrow indicator or horizontal marker with T letter to the right or to the left according to the coordinate scale of the oscillogram window.
The picture below shows the sine signal oscillogram, 500 mVpp. The trigger level is displayed as a horizontal marker with T letter and brightened with a horizontal line, set on 200 mV level. Trigger position coincides with the trigger level of 200 mV excess by the input signal and is displayed with a vertical marker with T letter.