GEN7iB
134
DIGITAL TRIGGER MODES
DIGITAL TRIGGER MODES
10
For the advanced trigger modes, the single-level trigger detector with programmable
hysteresis has been implemented twice to provide a dual-level trigger detector. Levels
are usually referenced as primary trigger level and secondary trigger level.
10.2.2 Valid trigger conditions
Triggerdetectionisbasedonlevelcrossing.Asignalhastocrossaspeciedlevelto
be considered a trigger condition. As a consequence, reaching the required level is not
a valid trigger condition. Since trigger detection is digital, inter-sample analog values
are omitted.
In the following graphs, these conditions are shown.
7
7
7ULJJHU 7ULJJHU
7
7ULJJHU
7ULJJHUOHYHO
6DPSOH
/DVWVDPSOHEHIRUHWULJJHU
7ULJJHU
7
$%
&
Fig. 10.2 Level crossing detector
Fig.10.2showsthebasictriggermodewithaspeciedlevel(T) and a level crossing
in a positive direction. In Fig. 10.2 (A),thetriggeroccursontherstsampleafterthe
level crossing. Fig. 10.2 (B) shows the situation in which a sample equals the set level.
Trigger does not occur until a sample is actually above the required level.
Since the trigger detector requires a level crossing, no trigger occurs when a signal is
above the set level when recording starts. This is depicted in Fig. 10.2 (C).
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