Keithley 2651A Reference Manual page 144

Model 2651A High Power System SourceMeter® Instrument Reference Manual
When the smuX.trigger.measure.action attribute is set to smuX.DISABLE or smuX.ENABLE,
the trigger model will operate in synchronous measurement mode. When it is set to smuX.ASYNC, it
will operate in asynchronous mode.
Each section of the trigger model performs a function:
Idle state:
Arm layer:
Trigger layer:
The remote trigger model dictates the sequence of operation for the SMU when it is configured to
perform a sweep. When the SMU comes to an event detector, it suspends operation and waits for the
event you have assigned to the stimulus input. If no event is assigned, the SMU continues
uninterrupted past the event detector and through the trigger model. When the SMU comes to an
action block, it performs the appropriate action, if enabled. The SMU loops through the arm and
trigger layers until the programmed arm and trigger counts are satisfied.
Configuring source and measure actions
The source action can be configured using any of the following functions:
smua.trigger.source.linearY()
smua.trigger.source.logY()
smua.trigger.source.listY()
Where:
Y = Source function
Source functions cannot be changed within a sweep. See
details about the sweep functions.
To enable the source action, set the smua.trigger.source.action attribute to smua.ENABLE.
2651A-901-01 Rev. A / March 2011
If a sweep is not in process, the SMU is in the idle state. Use the
smuX.trigger.initiate() function to move the SMU from the idle
state to the arm layer.
Begins a sweep. Each sweep starts and ends in the arm layer.
All source, measure, and pulse actions occur in the trigger layer.
•
Source: Outputs the programmed voltage or current source value.
• Measure: Where the current, voltage, resistance, and power measurements
occur.
• End pulse: The end pulse action sources the idle (or bias) level if the pulse
mode is enabled.
Section 3: Functions and features
Sweep Operation (on page 3-19) for more
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