2600S-901-01 Rev. C / January 2008
Return to
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
"Calibration".
Also see
Example
Reads calibration state for SMU A:
calstate = smua.cal.state
print(calstate)
Output:
0.00
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
"Calibration".
Also see
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 0
Ω
for calibration point 1 and 50
Ω
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
"Calibration".
Also see
Note: 2635/36 does not have contact check