Keithley 2635 Reference Manual

2600S-901-01 Rev. C / January 2008 Return to Section Topics 12-51
Series 2600 System SourceMeter® Instruments Reference Manual Section 12: Instrument Control Library
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
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.measure.calibrateY, smuX.source.calibrateY
Example Selects positive calibration constants for all subsequent measurements:
smua.cal.polarity = smua.CAL_POSITIVE

Keithley 2635 Specifications

General

Brand	Keithley
Model	2635
Category	Measuring Instruments
Language	English