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7 - Programming the DC Source
74
Enabling the Output Trigger System
When the dc source is turned on, the trigger subsystem is in the idle state. In this state, the trigger
subsystem is disabled, ignoring all triggers. Sending the following commands at any time returns the
trigger system to the idle state:
ABOR
*RST
*RCL
The INITiate commands move the trigger system from the idle state to the initiated state. This enables
the dc source to receive triggers. To initiate for a single triggered action, use:
INIT:SEQ1 or
INIT:NAME TRAN
After a trigger is received and the action completes, the trigger system will return to the idle state. Thus it
will be necessary to enable the system each time a triggered action is desired.
To keep the transient trigger system initiated for multiple triggers without having to send an initiate
command for each trigger, use:
INIT:CONT:SEQ1 ON or
INIT:CONT:NAME TRAN, ON
Selecting the Output Trigger Source
The only trigger source for output triggers is a command from the bus. Since BUS is the only trigger
source, the following command is provided for completeness only:
TRIG:SOUR BUS
Generating Triggers
Single Trigger
After you have specified the appropriate trigger source, you can generate triggers by sending one of the
following commands over the GPIB:
TRIG:IMM
*TRG
an IEEE-488 Group Execute Trigger bus command
When the trigger system enters the Output Change state upon receipt of a trigger (see figure 7-1), the
triggered functions are set to their programmed trigger levels. When the triggered actions are completed,
the trigger system returns to the idle state.
NOTE: The external trigger input port does not support output triggers.
Multiple Triggers
When you have programmed INITiate:CONTinuous:SEQuence1 ON as previously discussed, the trigger
system does not need to be initiated for each trigger; it responds to the next trigger as soon as it is
received. When each triggered action completes, the trigger system returns to the initiated state to wait
for the next trigger. INITiate:CONTinuous:SEQuence1 OFF returns the system to single trigger mode.