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Trigger/Arming Subsystem
The SCPI TRIGger subsystem enables syn
-
chronization of instrument actions with
specified internal or external events. The
following list gives some examples.
Instrument Action
Some examples of events to synchronize
with are as follows:
–
measurement
–
bus trigger
–
external signal level or pulse
–
10 occurrences of a pulse on the external
trigger input
–
other instrument ready
–
signal switching
–
input signal present
–
1 second after input signal is present
–
sourcing output signal
–
switching system ready
The ARM-TRIG Trigger
Configuration
Figure 6-15 gives a typical trigger config
-
uration, the ARM-TRIG model. The con
-
figuration contains two event-detection
layers: the ‘Wait for ARM’ and ‘Wait for
TRIG’ states.
Using the Subsystems
Trigger/Arming Subsystem 6-27
Initiated
Idle
Trigger system initiated
Still initiated
ARM conditions
satisfied
TRIGger conditions
satisfied
Wait for ARM
Wait for TRIG
Instrument
Actions
No longer
initiated
Completed No.
of ARM loops
Completed
No. of TRIGger
loops
Instrument
Actions
complete
Default state
after power-on
or reset
Arm Layer
Trigger Layer
Trigger system
initiated
ABORt
*RST
pon
Figure 6-15 Generalized ARM-TRIG
model.