19-106
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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
.
Also see
,
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.