Keithley 2601 Reference Manual page 310

Section 12: Instrument Control Library
Usage
caldue = smuX.cal.due
smuX.cal.due = caldue
Set caldue to the following value:
os.time({year=yr, month=mo, day=da})
where: yr 2005 to 2037
mo 1 to 12
da 1 to 31
Remarks • This attribute stores the calibration due date associated with the active calibration
set. The calibration due date can be read at any time but can only be assigned a
new value when calibration has been enabled with the
• This attribute is stored with the active calibration set. If a different calibration set is
restored, this attribute will reflect the due date stored with that set.
• Hour and minute can also be included in caldate as follows:
os.time({year=yr, month=mo, day=da, hour=hr, minute=mn})
Seconds can be included, but will be ignored due to the precision of the internal date
storage format.
• The date is stored as the number of seconds since UTC 12:00 am Jan 1, 1970.
Details See Section 16
smuX.cal.date, smuX.cal.restore,
Also see
Sets calibration due date for SMU A (July 1, 2006):
Example
smua.cal.due = os.time({year=2005, month=7, day=1})
smuX.cal.lock
Function Disables commands that change calibration settings.
Usage
smuX.cal.lock()
This function will disable the calibration functions that can change the calibration
Remarks
settings. It is an error to call this function while the calibration state is
smuX.CALSTATE_CALIBRATING
volatile memory, or a previous calibration set must be restored prior to locking
calibration.
Details See Section 16
Also see smuX.cal.restore, smuX.cal.save,
Example Disable calibration functions for SMU A:
smua.cal.lock()
12-50
-- Reads calibration due date.
-- Writes calibration due date.
"Calibration".
smuX.cal.state
X = SMU channel (a or b)
. The calibration constants must be written to non-
smuX.cal.state
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Series 2600 System SourceMeter® Instruments Reference Manual
smuX.cal.unlock
function.
2600S-901-01 Rev. C / January 2008