Section 7: TSP command reference Model 2657A High Power System SourceMeter® Instrument Reference Manual
7-222 2657A-901-01 Rev. B/December 2012
Details
Reading this attribute gives the output-off mode of the source. Setting this attribute configures the SMU output-
off mode.
The default sourceOffMode is smuX.OUTPUT_NORMAL. In this mode, the source function is configured
according to the smuX.source.offfunc attribute. The smuX.source.offfunc attribute controls whether the
SMU is configured as a 0 V voltage source or a 0 A current source. When the SMU is operating as a 0 A current
source, the smuX.source.offlimitv attribute sets the voltage limit (similar to how the
smuX.source.offlimiti attribute sets the current limit when the SMU is operating as a 0 V voltage source).
When the sourceOffMode is set to smuX.OUTPUT_ZERO, the source is configured to output 0 V just as
smuX.OUTPUT_NORMAL mode with smuX.source.offfunc = smuX.OUTPUT_DCVOLTS. If the source
function is voltage, the current limit is not changed. If the source function is current, the current limit is set to the
current source level or 10 percent of the current source range, whichever is greater.
When offmode is set to smuX.OUTPUT_HIGH_Z, the SMU opens the output relay when the output is turned off.
Example
smua.source.offmode = smua.OUTPUT_HIGH_Z
Sets the output-off mode for SMU
channel A to open the output relay
when the output is turned off.
Also see
Output-off states (on page 2-66)
smuX.source.offfunc
(on page 7-220)
smuX.source.offlimitY
(on page 7-220)
smuX.source.output
(on page 7-222)
smuX.source.output
This attribute sets the source output state (on or off).
Type TSP-Link accessible Affected by Where saved Default value
Attribute (RW) Yes SMU reset
Instrument reset
Recall setup
Not saved (0 smuX.OUTPUT_OFF)
Usage
sourceOutput = smuX.source.output
smuX.source.output = sourceOutput
sourceOutput
The source's output state setting; set to one of the following values:
0 or smuX.OUTPUT_OFF: Turns off the source output
1 or smuX.OUTPUT_ON: Turns on the source output
2 or smuX.OUTPUT_HIGH_Z: Turns off the output in high Z mode (allows you to go
to high Z mode without first setting the smuX.source.offmode attribute to
smuX.OUTPUT_HIGH_Z)
X
Source-measure unit (SMU) channel (for example, smua.source.output applies
to SMU channel A)
Details
Reading this attribute returns the output state of the source. Setting this attribute switches the output of the
source on or off.
When the output is switched on, the SMU sources either voltage or current, as set by smuX.source.func.
Setting this attribute to smuX.OUTPUT_HIGH_Z causes the output to turn off and go to the High Z mode. If the
smuX.source.output is read after setting this attribute to smuX.OUTPUT_HIGH_Z, it returns 0.
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