Model 2651A High Power System SourceMeter® Instrument Reference Manual
Section 3: Functions and features
2651A-901-01 Rev. A / March 2011
3-37
When the
smu
X
.trigger.measure.action
attribute is set to
smu
X
.DISABLE
or
smu
X
.
ENABLE
,
the trigger model will operate in synchronous measurement mode. When it is set to
smu
X
.ASYNC
, it
will operate in asynchronous mode.
Each section of the trigger model performs a function:
Idle state:
If a sweep is not in process, the SMU is in the idle state. Use the
smu
X
.trigger.initiate()
function to move the SMU from the idle
state to the arm layer.
Arm layer:
Begins a sweep. Each sweep starts and ends in the arm layer.
Trigger 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.
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.linear
Y
()
smua.trigger.source.log
Y
()
smua.trigger.source.list
Y
()
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
.
