Model 2651A High Power System SourceMeter® Instrument Reference Manual
Section 7: Command reference
2651A-901-01 Rev. A / March 2011
7-223
Example
smua.source.outputenableaction = smua.OE_OUTPUT_OFF
Sets SMU Channel A to turn the
output off if the output enable line
goes low (deasserted).
Also see
(on page 7-220)
smuX.source.rangeY
This attribute contains the source range.
Type
TSP-Link accessible
Affected by
Where saved
Default value
Attribute (RW)
Yes
SMU reset
Instrument reset
Recall
Saved setups
Voltage: 100e-3 (100 mV)
Current: 100e-9 (100 nA)
Usage
rangeValue
= smu
X
.source.range
Y
smu
X
.source.range
Y
=
rangeValue
rangeValue
Set to the maximum expected voltage or current to be sourced
X
Source-measure unit (SMU) channel (for example,
smua.measure.rangev
applies to SMU channel A)
Y
SMU source function (
v
= voltage,
i
= current)
Details
This attribute contains a value that sets the source-measure unit (SMU) to a fixed range large enough to source
the value. When read, the attribute contains the range the instrument is presently on when in autorange.
Assigning a value to this attribute sets the SMU to a fixed range large enough to source the assigned value. The
instrument will select the best range for sourcing a value of
rangeValue
.
Reading this attribute returns the positive full-scale value of the source range the SMU is currently using. With
source autoranging enabled, the output level controls the range. Querying the range after the level is set will
return the range the unit chose as appropriate for that source level.
This attribute is primarily intended to eliminate the time required by the automatic range selection performed by a
sourcing instrument. Because selecting a fixed range will prevent autoranging, an overrange condition can occur.
For example, sourcing 3.0 V on the Model 2651A 1 V range will cause an overrange condition.
Example
smua.measure.rangev = 1
Selects the 1 V source range for SMU channel A.
