Keithley 2461 Reference Manual

Section
6: SCPI command reference Model 2461 Interactive SourceMeter® Instrument
Reference Manual
6-230 2461-901-01 A/November 2015
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 Event constant
Front-panel TRIGGER key press
DISPlay
Notify trigger block
<n>
(1 to 8); the trigger model generates a
trigger event when it executes the notify block
NOTify<n>
A command interface trigger:
• Any remote interface: *TRG
• GPIB only: GET bus command
• VXI-11: VXI-11 command
device_trigger
COMMand
Line edge (either rising, falling, or either based on the
configuration of the line) detected on digital input line
<n>
(1 to 6)
DIGio<n>
Line edge detected on TSP-Link synchronization line
<n>
(1 to 3)
TSPLink<n>
Appropriate LXI trigger packet is received on LAN trigger object
<n>
(1 to 8)
LAN<n>
Trigger event blender <n> (1 or 2), which combines trigger events
BLENder<n>
Trigger timer <n> (1 to 4) expired
TIMer<n>
Source limit condition occurs
SLIMit
Example
*RST
SENS:FUNC "CURR"
TRIG:LOAD "LoopUntilEvent", DISP, 25
INIT
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.
Also see
None

Keithley 2461 Specifications

General

Maximum Current	7 A
Power	100 W
Resolution	6.5 digits
Source Measure Unit (SMU)	Yes
DC Voltage	100 V
Maximum Voltage	100 V
Display	5-inch capacitive touchscreen
Connectivity	USB, GPIB
Software	TSP
DC Current	7 A
Current Source Range	0 to 7 A
Voltage Measurement Range	100 mV to 100 V
Current Measurement Range	10 nA to 7 A
Voltage Measurement Resolution	100 nV