2600S-901-01 Rev. C / January 2008 Return to Section Topics 12-53
Series 2600 System SourceMeter® Instruments Reference Manual Section 12: Instrument Control Library
Remarks When reading this read-only attribute, calstate returns one of the following values:
0 smuX.CALSTATE_LOCKED Calibration is locked.
1 smuX.CALSTATE_CALIBRATING The calibration constants or dates have been
changed but not yet saved to nonvolatile
memory.
2 smuX.CALSTATE_UNLOCKED Calibration is unlocked but none of the
calibration constants or dates have changed
since the last save/restore.
Details See Section 16 "Calibration".
Also see smuX.cal.due, smuX.cal.restore, smuX.cal.save
Example Reads calibration state for SMU A:
calstate = smua.cal.state
print(calstate)
Output: 0.000000e+00
The above output indicates that calibration is locked.
smuX.cal.unlock
X = SMU channel (a or b)
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 "Calibration".
Also see smuX.cal.password
Example Unlocks calibration for SMU A:
smua.cal.unlock("KI0026XX")
smuX.contact.calibratelo
X = SMU channel (a or b)
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 "Calibration".
Also see smuX.contact.calibratehi
Note: 2635/36 does not have contact check
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