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Programming the
Trigger System
In This Subsection
This subsection discusses the lay ered trigger mo del used in SCPI
instrumen ts. It also outlines some commonly encoun tered trigger
congurations and programming metho ds. T rigger system topics are
explained in the follo wing paragraphs:
Generalized T rigger
Mo del
These paragraphs explain the structure and
comp onen ts of the lay ered trigger mo del used in
all SCPI instrumen ts.
Common T rigger
Congurations
These paragraphs explain the INIT and TRIG
congurations implemen ted in the sw ept signal
generator.
T rigger Command
Denitions
These paragraphs pro vide condensed denitions
for the k eyw ords used in this subsection.
Understanding trigger systems requires more tec hnical exp ertise than
most other topics co v ered in this section. If y ou nd this subsection
dicult, k eep in mind that y ou do not ha v e to program the trigger
system to make measuremen ts or output signals. Using MEASure ,
READ , or INITiate , y ou can a v oid ha ving to learn the information in
this subsection.
Generalized Trigger
Model
Ov erview
An instrumen t trigger system sync hronizes instrumen t actions
with sp ecied ev en ts. An instrumen t action may b e to make a
measuremen t or source an output signal. The ev en ts used to
sync hronize these actions include softw are trigger commands,
c hanging signal lev els, and pulses on BNC connectors. The trigger
system also lets y ou sp ecify the n um b er of times to rep eat certain
actions, and dela ys b et w een actions.
Figure 1-35 sho ws a simplied view of the generalized SCPI trigger
mo del. Instrumen ts may implemen t some or all of this mo del, to
accommo date v arying needs. Eac h unshaded blo c k in Figure 1-35
represen ts a particular trigger state . The generalized trigger mo del
allo ws an arbitrary n um b er of ev en t-detection states. Note that there
can b e t w o paths in to a state and t w o paths out of a state. These are
called the do wn w ard en trance and exit, and the up w ard en trance and
exit. Upwar d means moving tow ards the idle state and downwar d
means moving tow ards instrumen t actions.
Getting Started Programming 1-109