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Triggering Output Changes
The dc source has two independent trigger systems. One is used for generating output changes, and the
other is used for triggering measurements. This section describes the output trigger system. The
measurement trigger system is described under "Triggering Measurements".
SCPI Triggering Nomenclature
In SCPI terms, trigger systems are called sequences. When more than one trigger system exists, they are
differentiated by naming them SEQuence1 and SEQuence2. SEQuence1 is the transient trigger system
and SEQuence2 is the measurement trigger system. The dc source uses aliases with more descriptive
names for these sequences. These aliases can be used instead of the sequence forms.
Sequence Form
Alias
SEQuence1
TRANsient
SEQuence2
ACQuire
Output Trigger System Model
Figure 7-1 is a model of the output trigger system. The rectangular boxes represent states. The arrows
show the transitions between states. These are labeled with the input or event that causes the transition
to occur.
INITiate:CONTinuous OFF
INITiate:CONTinuous ON
Setting the Voltage or Current Trigger Levels
To program output trigger levels, you must first specify a voltage or current trigger level that the output
will go to once a trigger signal is received. Use the following commands to set the output trigger level:
VOLTage:TRIGgered <n>
CURRent:TRIGgered <n>
NOTE:
Until they are programmed, trigger levels will be the same as the corresponding voltage
or current levels. For example, if a dc source is powered up and the voltage is
programmed to 6, then the trigger level is also set to 6. Once you program a trigger level,
it will stay at that value regardless of how you subsequently reprogram the voltage.
Figure 7-1. Model of Output Triggers
or
Programming the DC Source - 7
IDLE STATE
INITiate[:IMMediate]
INITIATED STATE
TRIGGER RECEIVED
OUTPUT
LEVEL
CHANGE
ABORt
*RST
*RCL
59
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