As explained later in this chapter, a signal must actually cross the preset level.
This is to avoid erroneous triggering due to a small amount of noise on the
signal. To make the trigger detector even more stable when noisy signals are
used, the single
-
level trigger detector has been expanded with a
hysteresis
.
After the level detector signals a level crossing, a new level crossing will only
be signaled if the input signal first goes outside the hysteresis band and then
returns to the trigger level.
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.
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