Keithley 2601 Reference Manual page 313

Series 2600 System SourceMeter® Instruments Reference Manual
Remarks When reading this read-only attribute, calstate returns one of the following values:
0 smuX.CALSTATE_LOCKED
1 smuX.CALSTATE_CALIBRATING
2 smuX.CALSTATE_UNLOCKED
Details See Section 16
Also see smuX.cal.due, smuX.cal.restore,
Reads calibration state for SMU A:
Example
calstate = smua.cal.state
print(calstate)
Output:
0.000000e+00
The above output indicates that calibration is locked.
smuX.cal.unlock
Function Enables the commands that change calibration settings.
Usage
smuX.cal.unlock(password)
password Calibration password.
Remarks • This function enables the calibration functions to change the calibration settings.
• The password when the unit is shipped from the factory is "KI0026XX".
Details See Section 16
Also see smuX.cal.password
Example Unlocks calibration for SMU A:
smua.cal.unlock("KI0026XX")
smuX.contact.calibratelo
Function Calibrate the low/sense low contact check measurement.
Usage
smuX.contact.calibratehi(cp1measured, cp1reference, cp2measured,
cp2reference)
cp1measured -- the value measured by this SMU for calibration point 1.
cp1reference -- the reference measurement for calibration point 1 as measured
externally.
cp2measured -- the value measured by this SMU for calibration point 2.
cp2reference -- the reference measurement for calibration point 2 as measured
externally.
Remarks • Contact check measurement calibration does not require range information.
• Typically the two calibration points used will be near 0Ω for calibration point 1 and 50Ω for
calibration point 2.
• All four measurements (cp1measured, cp1reference, cp2measured, and
cp2reference) must be made with the active calibration set. Corruption of the
calibration constants may result if this is not heeded.
• The new calibration constants will be activated immediately but they will not be
written to non-volatile storage. Use smuX.cal.save to commit the new constants to
nonvolatile storage. The active calibration constants will stay in effect until the
instrument is power cycled or a calibration set is loaded from non-volatile storage with the
smuX.cal.restore function.
• This function will be disabled until a successful call to smuX.cal.unlock is made.
Details See Section 16
Also see smuX.contact.calibratehi
Note: 2635/36 does not have contact check
2600S-901-01 Rev. C / January 2008
Calibration is locked.
The calibration constants or dates have been
changed but not yet saved to nonvolatile
memory.
Calibration is unlocked but none of the
calibration constants or dates have changed
since the last save/restore
"Calibration".
smuX.cal.save
X = SMU channel (a or b)
"Calibration".
X = SMU channel (a or b)
"Calibration".
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Section 12: Instrument Control Library
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