Keithley 2601 Reference Manual page 311

Series 2600 System SourceMeter® Instruments Reference Manual
smuX.cal.password
Attribute Password to enable calibration.
Usage
smuX.cal.password = newpassword
newpassword
Remarks • A new password can only be assigned when calibration has been unlocked.
• The calibration password is write-only and cannot be read.
Details See Section 16
Example Assign a new calibration password for SMU A:
smua.cal.password = "LetMeIn"
smuX.cal.polarity
Attribute Control which calibration constants are used for all subsequent measurements.
Usage
calpolarity = smuX.cal.polarity
smuX.cal.polarity = calpolarity
Set calpolarity to one of the following values:
or
0 smuX.CAL_AUTO
or
1 smuX.CAL_POSITIVE
or
2 smuX.CAL_NEGATIVE
Remarks • This attribute controls which polarity calibration constants are used to make all
subsequent measurements. This attribute does not affect t
smuX.measure.calibrateY
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 Section 16
Also see smuX.measure.calibrateY,
Example Selects positive calibration constants for all subsequent measurements:
smua.cal.polarity = smua.CAL_POSITIVE
2600S-901-01 Rev. C / January 2008
X = SMU channel (a or b)
The new password (string).
X = SMU channel (a or b)
Automatic polarity detection.
Measure with positive polarity calibration
constants.
Measure with negative polarity calibration
constants.
or the
smuX.source.calibrateY
"Calibration".
smuX.source.calibrateY
Return to Section Topics
-- Reads cal polarity.
-- Writes cal polarity.
he
Section 12: Instrument Control Library
function . The
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