Keithley 2651A, Reference Manual

Page: 547 / 800

Model 2651A High Power System SourceMeter® Instrument Reference Manual Section 7: Command reference
2651A-901-01 Rev. A / March 2011 7-239
Details
The measurements, as they are performed, are stored in a reading buffer. If the instrument is configured to return
multiple readings where one is requested, the readings will be available as they are made. Measurements are in
the following units of measure:
v
= volts,
i
= amperes,
r
= ohms,
p
= watts.
The
smu X .trigger.measure.iv()
function stores current readings in
ibuffer
and voltage readings in
vbuffer
.
If a given reading buffer contains any data, it will be cleared prior to taking any measurements, unless the
reading buffer has been configured to append data.
The SMU only retains the last call to any one of these functions and only that measure action will be performed.
After configuring the measurements to make with this function, remember to enable the measure action by
setting
smu X .trigger.measure.action
=
smu X .ENABLE
.
Example
smua.trigger.measure.v(vbuffername)
smua.trigger.measure.action = smua.ENABLE
Stores voltage readings during the
sweep for SMU channel A in buffer
vbuffername
.
Also see
smuX.measure.Y() (on page 7-205)
smuX.nvbufferY (on page 7-208)
smuX.trigger.measure.action (on page 7-235)
waitcomplete() (on page 7-374)
Reading buffers (on page 3-6)
Sweep Operation (on page 3-19)
Triggering (on page 3-32)
smuX.trigger.MEASURE_COMPLETE_EVENT_ID
This constant contains the measure complete event number.
Type TSP-Link accessible Affected by Where saved Default value
Constant Yes
Usage
eventID = smu X .trigger.MEASURE_COMPLETE_EVENT_ID
eventID
The measure complete event number.
X
Source-measure unit (SMU) channel (for example,
smua.trigger.MEASURE_COMPLETE_EVENT_ID
applies to SMU channel A)
Details
Set the stimulus of any trigger event detector to the value of this constant to have it respond to measure
complete events from this SMU.
Also see
Triggering (on page 3-32)