Keithley 2461 Reference Manual page 607

Section 6: SCPI command reference
Details
The event constant is the event that ends infinite triggering or ends readings set to occur before the
trigger and start post-trigger readings. The trigger model makes readings until it detects the event
constant. After the event, it makes a finite number of readings, based on the setting of the trigger
position.
The position marks the location in the reading buffer where the trigger will occur. The position is set
as a percentage of the active buffer capacity. The buffer captures measurements until a trigger
occurs. When the trigger occurs, the buffer retains the percentage of readings specified by the
position, then captures remaining readings until 100 percent of the buffer is filled. For example, if this
is set to 75 for a reading buffer that holds 10,000 readings, the trigger model makes 2500 readings
after it detects the source event. There will be 7500 pre-trigger readings and 2500 post-trigger
readings.
The instrument makes two sets of readings. The first set is made until the trigger event occurs. The
second set is made after the trigger event occurs, up to the number of readings calculated by the
position parameter.
You cannot have the event constant set at none when you run this predefined trigger model.
You can use the TRIGger:BLOCk:LIST? command to view the trigger model blocks in a list format.
Trigger events
Event description
Front-panel TRIGGER key press
Notify trigger block <n> (1 to 8); the trigger model generates a
trigger event when it executes the notify block
A command interface trigger:
Any remote interface: *TRG
•
GPIB only: GET bus command
•
VXI-11: VXI-11 command device_trigger
•
Line edge (either rising, falling, or either based on the
configuration of the line) detected on digital input line <n> (1 to 6)
Line edge detected on TSP-Link synchronization line <n> (1 to 3)
Appropriate LXI trigger packet is received on LAN trigger object
<n> (1 to 8)
Trigger event blender <n> (1 or 2), which combines trigger events BLENder<n>
Trigger timer <n> (1 to 4) expired
Source limit condition occurs
Example
*RST
SENS:FUNC "CURR"
TRIG:LOAD "LoopUntilEvent", DISP, 25
INIT
Also see
None
6-230
Model 2461 Interactive SourceMeter® Instrument Reference Manual
Event constant
DISPlay
NOTify<n>
COMMand
DIGio<n>
TSPLink<n>
LAN<n>
TIMer<n>
SLIMit
Reset the instrument.
Set the instrument to measure DC current.
Set the LoopUntilEvent trigger model to make
measurements until the front-panel TRIGGER
key is pressed after starting the trigger model,
then make measurements that constitute 75 % of
the reading buffer.
Start the trigger model.
2461-901-01 A/November 2015