Tektronix KEITHLEY 2600B Series

Section 9: TSP command reference Series 2600B System SourceMeter® instrument Reference Manual
9-204 2600BS-901-01 Rev. F/August 2021
This attribute is stored with the active calibration set. If a different calibration set is restored, this
attribute reflects the due date stored with that set.
smuX.cal.due must be set to the date the next calibration is required using the UTC time and date.
The date is stored as the number of seconds since UTC 12:00 am Jan 1, 1970.
Due to the internal storage format, smuX.cal.due is only accurate to within a few minutes of the
value set.
Example
smua.cal.due = os.time() + 365 * 24 * 60 * 60
Sets the SMU channel A calibration due date
equal to one year from the present time set
on the instrument.
Also see
Adjustment (on page 10-15)
os.time() (on page 9-169)
smuX.cal.adjustdate (on page 9-201)
smuX.cal.date (on page 9-202)
smuX.cal.lock() (on page 9-204)
smuX.cal.restore() (on page 9-206)
smuX.cal.state (on page 9-208)
smuX.cal.unlock() (on page 9-209)
smuX.cal.lock()
This function disables the commands that change calibration settings.
Type
TSP-Link accessible
Affected by
Where saved
Default value
Function
Yes
Usage
smuX.cal.lock()
X
Source-measure unit (SMU) channel (for example, smua.cal.lock() specifies
SMU channel A)
Details
Before you can lock calibration, the calibration constants must be written to nonvolatile memory or a
previous calibration set must be restored. Error code 5012, "Cal data not saved - save or restore
before lock," results if this function is called when the calibration state is
smuX.CALSTATE_CALIBRATING.
Example
smua.cal.lock()
Disables calibration functions for SMU channel A.
Also see
Adjustment (on page 10-15)
smuX.cal.restore() (on page 9-206)
smuX.cal.save() (on page 9-207)
smuX.cal.state (on page 9-208)
smuX.cal.unlock() (on page 9-209)