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Programming the DC Source - 3
25
Internally Triggered Measurements
You can use the data acquisition trigger system to synchronize the timing of the voltage and current data
acquisition with a BUS or internal trigger source. Then use the FETCh commands to return different
calculations from the data acquired by the measurement trigger.
SCPI Triggering Nomenclature
As previously explained under "Triggering Output Changes", the dc source uses the following sequence
name and alias for the measurement trigger system. This alias can be used instead of the sequence form.
Sequence Form Alias
SEQuence2 ACQuire
Measurement Trigger System Model
Figure 3-2 is a model of the measurement 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.
ACQUIRED
INITIATED STATE
IDLE STATE
ABORt
*RCL
*RST
TRIGGER RECEIVED
INITiate
[
:IMMediate
]
TRIG
g
er:COUNt
COMPLETE?
YES
NO
SENSe:SWEep:POINts
Figure 3-2. Model of Measurement Triggers
Initiating the Measurement Trigger System (Agilent 66312A, 66332A Only)
When the dc source is turned on, the trigger system is in the idle state. In this state, the trigger system
ignores all triggers. Sending the following commands at any time returns the trigger system to the Idle
state:
ABORt
*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 measurement trigger, use: