GEN7iB
118
ACQUISITION AND STORAGE
ACQUISITION AND STORAGE
9
Triggers
The moment in time where a Sweep interval occurs is determined by Triggers, and the
lengthofasweepbyuserspecicationandpossiblybytriggersaswell.Triggersare
causedbyuser-denedeventssuchasthelevelcrossingofasignal,resultofacalcu-
lation crossing a level, a rising edge of an external signal, etc. Examples of different
types of sweeps are shown below:
3UHWULJJHUPV
*URXS
*URXS
*URXS&$1
3RVWWULJJHUPV
Fig. 9.3 Sweep - based on single trigger
A Asweepbasedonasingletrigger,thesweeplengthisdenedbytheuser-dened
pre- and post-trigger times.
%HWZHHQ7ULJJHU
3UHWULJJHUPV 3RVWWULJJHUPV
*URXS
*URXS
*URXS&$1
6DPSOHEDVHGUHVXOWV
%
Fig. 9.4 Sweep - based on multiple triggers
B Asweepbasedonmultipletriggers,thesweeplengthisdenedbytheuser-de-
nedpre-andpost-triggertimesandwhenthelasttriggeroccurs(everytrigger(re)
starts the post-trigger time).
%HWZHHQ7ULJJHU
3UHWULJJHUPV 3RVWWULJJHUPV
*URXS
*URXS
*URXS&$1
6DPSOHEDVHGUHVXOWV
Fig. 9.5 Sweep - based on a trigger and a stop-trigger
C Asweepbasedonatriggerandastop-trigger,thesweeplengthisdenedbythe
user-denedpre-andpost-triggertimesandwhenthestop-triggeroccurs(starts
the post-trigger time)