12-62 Instrument Control Library Series 2600 System SourceMeters Reference Manual
2600S-901-01 Rev. A / May 2006 Return to Section 12 topics
smuX.cal.password
X = SMU channel (a or b)
Attribute Password to enable calibration.
Usage smuX.cal.password = newpassword
newpassword The new password (string).
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 (calibration).
Also see smuX.makebuffer
Example
Assign a new calibration password for SMU A:
smua.cal.password = "LetMeIn"
smuX.cal.polarity
X = SMU channel (a or b)
Attribute Control which calibration constants are used for all subsequent measurements.
Usage
calpolarity = smuX.cal.polarity -- Reads cal polarity.
smuX.cal.polarity = calpolarity -- Writes cal polarity.
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 Section 16 (calibration).
Also see smuX.makebuffer, smuX.measure.calibrateY, smuX.source.calibrateY
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