Programming The Trigger System; In This Subsection; Generalized Trigger Model; Overview - HP 8360 B Series User Manual

Programming the
Trigger System

In This Subsection

Generalized Trigger
This subsection discusses the layered trigger model used in SCPI
instruments. It also outlines some commonly encountered trigger
configurations and programming methods. Trigger system topics are
explained in the following paragraphs:
Generalized Trigger These paragraphs explain the structure and
Model
Common Trigger
Configurations
Trigger Command
Definitions
Understanding trigger systems requires more technical expertise than
most other topics covered in this section. If you find this subsection
difficult, keep in mind that you do not have to program the trigger
system to make measurements or output signals. Using MEASure,
READ, or INITiate, you can avoid having to learn the information in
this subsection.

Overview

Model
An instrument trigger system synchronizes instrument actions
with specified events. An instrument action may be to make a
measurement or source an output signal. The events used to
synchronize these actions include software trigger commands,
changing signal levels, and pulses on BNC connectors. The trigger
system also lets you specify the number of times to repeat certain
actions, and delays between actions.
Figure l-35 shows a simplified view of the generalized SCPI trigger
model. Instruments may implement some or all of this model, to
accommodate varying needs. Each unshaded block in Figure l-35
represents a particular
allows an arbitrary number of event-detection states. Note that there
can be two paths into a state and two paths out of a state. These are
called the downward entrance and exit, and the upward entrance and
Upward
exit.
means moving towards instrument actions.
components of the layered trigger model used in
all SCPI instruments.
These paragraphs explain the INIT and TRIG
configurations implemented in the swept signal
generator.
These paragraphs provide condensed definitions
for the keywords used in this subsection.
trigger state.
means moving towards the idle state and
Getting Started Programming l-109
The generalized trigger model
downward