Fluke PM6685, PM6681R Instrument Action, ARM-TRIG Trigger Configuration, Trigger/Arming Subsystem

Using the Subsystems

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 6-15gives 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.

Default state	ABORt			Idle
		*RST
after power-on
or reset		pon
Trigger system initiated					No longer
					initiated
Trigger system				Initiated
initiated		Still initiated			Completed No.
					of ARM loops
Arm Layer			Wait for ARM
ARM conditions					Completed
					No. of TRIGger
		satisfied
					loops
Trigger Layer			Wait for TRIG
TRIGger conditions					Instrument
		satisfied			Actions
					complete

Instrument

Actions

Figure 6-15Generalized ARM-TRIG model.

Trigger/Arming Subsystem 6-27