Tektronix Keithley 2651A Reference Manual page 577

Section 7: TSP command reference
smuX.cal.polarity
This attribute controls which calibration constants are used for all subsequent measurements.
Type TSP-Link accessible
Attribute (RW) Yes
Usage
calPolarity = smuX.cal.polarity
smuX.cal.polarity = calPolarity
calPolarity
X
Details
This attribute controls which polarity calibration constants are used to make all subsequent
measurements.
This attribute does not affect the smuX.measure.calibrateY() command. The polarity for
smuX.measure.calibrateY() is dictated by the range parameter that is defined for it. The
measurement calibration commands require the measurements provided to have been made using
the polarity being calibrated.
When making measurements for calibration points far away from zero, the desired polarity constants
are inherently used. However, when making measurements near zero, it is possible that the
instrument could use the calibration constants from the wrong polarity. Setting smuX.cal.polarity
to positive or negative forces measurements to be made using the calibration constants for a given
polarity, rather than basing the choice on the raw measurement data.
This attribute can only be set to positive or negative when calibration is unlocked. This attribute is
automatically set to smuX.CAL_AUTO when calibration is locked.
Example
smua.cal.polarity = smua.CAL_POSITIVE
Selects positive calibration constants for all subsequent measurements.
Also see
Adjustment (on page 12-15)
reset() (on page 7-197)
smuX.cal.lock()
smuX.cal.unlock()
smuX.measure.calibrateY()
smuX.reset() (on page 7-264)
smuX.source.calibrateY()
7-232
Model 2651A High Power System SourceMeter® Instrument Reference Manual
Affected by
Instrument reset
SMU reset
SMU cal. lock
Recall setup
The polarity to use for measurements. Set to one of the following values:
▪
0 or smuX.CAL_AUTO: Automatic polarity detection
▪
1 or smuX.CAL_POSITIVE: Measure with positive polarity
calibration constants
▪
2 or smuX.CAL_NEGATIVE: Measure with negative polarity
calibration constants
SMU channel (for example, smua.cal.polarity applies to SMU channel A)
(on page 7-230)
(on page 7-236)
(on page 7-246)
(on page 7-268)
Where saved Default value
Not saved 0 (smuX.CAL_AUTO)
2651A-901-01 Rev. C October 2021