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Comments • The following table explains the possible choices.
Parameter Value Source of Trigger
BUS Group Execute Trigger (GET) bus command,
*TRG common command, or TRIGger
command.
EXTernal “Event In” signal at rear panel BNC
connector, or TRIGger command.
HOLD Only the TRIGger command will cause
trigger.
IMMediate The trigger signal is always true (continuous
triggering).
• While an instrument which uses the "Event In" signal has EXT set, no
other instrument which uses the "Event In" signal may set EXT, or an
error 1500 "External trigger source already allocated" will result.
• While TRIG:SOUR is IMM, you need only INITiate the trigger system to
start the Pacer.
• Related Commands: ABORt, INITiate, *TRG
• *RST Condition: TRIG:SOUR IMM
Example Specifying the Trigger Source.
TRIG:SOUR HOLD trigger source is TRIG
command
SOUR:PULS:COUN 1E3 output 1000 Pacer pulses
SOUR:PULS:PER .1 S pulse period set to .1 second
TRIG:DELAY .75 S start Pacer .75 sec after trigger
INIT go to Wait For Trigger state
TRIG trigger the Pacer to output
pulses.
:SOURce? TRIGger:SOURce? returns the current trigger source configuration. Response
data can be one of; BUS, EXT, HOLD, or IMM. See the TRIG:SOUR
command for more response data information.
Example Querying the Trigger Source.
TRIG:SOUR HOLD trigger source is TRIG
command
TRIG:SOUR? ask System Instrument to
return trigger source
configuration
enter statement input selection of trigger source
TRIGger :SOURce?
System Instrument Command Reference 7-53