Keithley 2651A Reference Manual page 152

Model 2651A High Power System SourceMeter® Instrument Reference Manual
Stimulus input:
smua.trigger.measure.stimulus
Trigger event:
smua.trigger.SOURCE_COMPLETE_EVENT_ID
Timer action overruns
The timer generates an action overrun when it is triggered while a timer delay is still in progress.
Using timers to perform pulse mode sweeps
Timers can also be used to control the pulse width during a pulsed sweep. To create a pulse train, a
second timer must be used to configure the pulse period. The examples below show a single pulse
output and a pulse train output.
The SMU end pulse action smua.trigger.endpulse.action must be set to
smua.SOURCE_IDLE in order to create a pulse.
Single pulse example:
The programming example below illustrates how to use a single timer to control the pulse width of a
single-shot pulse measurement. The programming example configures the timer and SMU as follows:
Timer 1: Pulse width timer
•
Set the delay attribute of a timer equal to the desired pulse width.
•
Configure the timer to trigger when the SMU moves out of the arm layer of the trigger model.
•
Assign the trigger event generated by the timer to the stimulus input of the SMU end pulse event
detector.
2651A-901-01 Rev. A / March 2011
Figure 48: Using a timer for an SDM cycle
Timer
SMU A
#1
Stimulus input:
trigger.timer[1].stimulus
Legend:
NOTE
Section 3: Functions and features
= Trigger object
= Trigger events
= External output trigger
= Stimulus input
= External input trigger
Trigger event:
trigger.timer[1].EVENT_ID
3-45