Keithley 2600a series User Manual

19-106 Return to Section Topics 2600AS-901-01 Rev. B / September 2008
Section 19: Remote Commands Series 2600A System SourceMeter® Instruments Reference Manual
smuX.cal.polarity
X = SMU channel (a or b)
Attribute Control which calibration constants are used for all subsequent measurements.
Default smuX.CAL_AUTO
TSP-Link
accessibility
This attribute can be accessed from a remote TSP-Link node.
Usage calpolarity = smuX.cal.polarity -- Reads cal polarity.
smuX.cal.polarity = calpolarity -- Writes cal polarity.
calpolarity The polarity to use for measurements.
Set calpolarity 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.
Remarks • This attribute controls which polarity calibration constants are used to make all subsequent
measurements. This attribute does not affect the smuX.measure.calibrateY or the
smuX.source.calibrateY function. The polarity for those commands are dictated by the
range parameter given to the command.
• The measurement calibration commands require the measurements provided to have been
made using the polarity being calibrated. When the calibration points are sufficiently far away
from zero the desired polarity constants are inherently used when making those measurements.
When measuring near zero, it is possible for the measurement to be made using the calibration
constants from either polarity without knowing which was used. Setting this attribute 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
will automatically be set back to CAL_AUTO when calibration is locked.
Details See Calibration in Section 20.
Also see smuX.measure.calibrateY, smuX.source.calibrateY
Example Selects positive calibration constants for all subsequent measurements:
smua.cal.polarity = smua.CAL_POSITIVE
smuX.cal.restore
X = SMU channel (a or b)
Function Loads a stored set of calibration constants.
TSP-Link
accessibility
This function can be accessed from a remote TSP-Link node.
Usage There are two ways to use this function:
smuX.cal.restore()
smuX.cal.restore(calset)
calset Calibration set to be loaded.
Set calset to one of the following values:
smuX.CALSET_NOMINAL A set of calibration constants that are uncalibrated, but set
to nominal values to allow rudimentary functioning of the
instrument.
smuX.CALSET_FACTORY The calibration constants when the instrument left the
factory.
smuX.CALSET_DEFAULT The normal calibration set.
smuX.CALSET_PREVIOUS The calibration set that was used before the last default
set was overwritten.
If calset is not specified, smuX.CALSET_DEFAULT will be used.

Keithley 2600a series Specifications

General

Brand	Keithley
Model	2600a series
Category	Measuring Instruments
Language	English