Model 2651A High Power System SourceMeter® Instrument User's Manual
Section 6: Characterization of power discretes
Series 26xxA instrument's trigger model operation
The following figure illustrates the Series 26xxA trigger model configuration for this test.
Figure 21: Series 26xxA instrument's trigger model for IV curve characterization
tsplink.trigger[2].
EVENT_ID
stimulus
mode = tsplink.TRIG_FALLING
tsplink.trigger[1].
EVENT_ID
stimulus
mode = tsplink.TRIG_SYNCHRONOUSA
node[2].
Series 26xxA (subordinate)*
Idle
Arm layer
Trigger layer
smua.trigger.
arm.count = 1
count = 5
IDLE_EVENT_ID
SWEEPING_EVENT_ID
SWEEP_COMPLETE_EVENT_ID
ARMED_EVENT_ID
SOURCE_COMPLETE_EVENT_ID
MEASURE_COMPLETE_EVENT_ID
PULSE_COMPLETE_EVENT_ID
arm.stimulus
source.stimulus
measure.stimulus
endpulse.stimulus
* Model 260xA, Model 261xA, or Model 263xA
TSP-Link bus
When the configured trigger model of the Series 2600A instrument is initiated, the following occurs:
1. The source-measure unit (SMU) trigger model passes through the Arm Layer, enters the Trigger
Layer, reaches the Source Event, pauses, and then waits for an event trigger from TSP-Link
®
trigger 1.
2. A TSP-Link trigger is received by TSP-Link trigger 1. Because TSP-Link trigger 1 is configured as
a synchronous acceptor, it latches the line low and outputs an event trigger to the SMU Source
Event.
3. The SMU Source Event Detector receives the event trigger from TSP-Link trigger 1, sets the
SMU output to the step level, waits a programmed source delay (if any) and continues.
4. The SMU trigger model moves to the Measure Event, where it waits a programmed measure
delay (if any), takes a measurement, and then outputs the MEASURE_COMPLETE event trigger.
5. TSP-Link trigger 1 receives the MEASURE_COMPLETE event trigger and releases the TSP-link
trigger line, telling the Model 2651A that it has completed its step and that the Model 2651A may
begin its sweep.
6. The SMU trigger model moves to the End Pulse Event, where it stops and waits for an event
trigger from TSP-Link trigger 2.
7. A TSP-Link trigger is received by TSP-Link trigger 2, indicating that the Model 2651A instrument
sweep has completed and it is safe to go to the next step. TSP-Link trigger 2 outputs an event
trigger to the SMU End Pulse Event Detector.
8. The SMU End Pulse Event Detector receives an event trigger from TSP-Link trigger 2, completes
the End Pulse Action, and then continues.
2651A-900-01 Rev. A / March 2011
6-9
