Tektronix Keithley 2651A Reference Manual page 622

Model 2651A High Power System SourceMeter® Instrument Reference Manual
smuX.source.offmode
This attribute sets the source output-off mode.
Type TSP-Link accessible
Attribute (RW) Yes
Usage
sourceOffMode = smuX.source.offmode
smuX.source.offmode = sourceOffMode
sourceOffMode
Details
Reading this attribute returns 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 sourceOffMode 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 to open the output relay when the output is turned off.
Also see
Output-off states
smuX.source.offfunc
smuX.source.offlimitY
smuX.source.output
2651A-901-01 Rev. C October 2021
Affected by
SMU reset
Instrument reset
Recall setup
The output-off setting; set to one of the following values:
▪
0 or smuX.OUTPUT_NORMAL: Configures the source function according to
smuX.source.offfunc attribute
▪
1 or smuX.OUTPUT_ZERO: Configures source to output 0 V as
smuX.OUTPUT_NORMAL with different compliance handling (see the Details
below)
▪
2 or smuX.OUTPUT_HIGH_Z: Opens the output relay when the output is
turned off
(on page 2-65)
(on page 7-275)
(on page 7-276)
(on page 7-278)
Section 7: TSP command reference
Where saved Default value
Saved setup 0 (smuX.OUTPUT_NORMAL)
7-277