Keithley 2657A, Reference Manual, Page: 493 / 805

Section 7: TSP command reference Model 2657A High Power System SourceMeter® Instrument Reference Manual
7-180 2657A-901-01 Rev. B/December 2012
Details
This attribute stores the calibration date that is associated with the active calibration set. The calibration date can
be read at any time but can only be assigned a new value when calibration has been enabled with the
smu
X
.cal.unlock()
function. It is typically set to the date when the instrument was calibrated.
This attribute is stored with the active calibration set. If a different calibration set is restored, this attribute will
reflect the date stored with that set.
smu
X
.cal.date
must be set to the date the calibration was done 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,
smu
X
.cal.date
is accurate to within a few minutes of the value set.
Example
smua.cal.date = os.time() Sets calibration date for SMU channel A to the current time
set on the instrument.
Also see
Adjustment (on page B-14)
os.time() (on page 7-147)
smuX.cal.adjustdate (on page 7-178)
smuX.cal.due (on page 7-180)
smuX.cal.lock() (on page 7-181)
smuX.cal.restore() (on page 7-184)
smuX.cal.save() (on page 7-185)
smuX.cal.state (on page 7-185)
smuX.cal.unlock() (on page 7-186)
smuX.cal.due
This attribute stores the calibration due date for the next calibration.
Type TSP-Link accessible Affected by Where saved Default value
Attribute (RW) Yes SMU cal. restore SMU nonvolatile
memory 0
Usage
calDue
= smu
X
.cal.due
smu
X
.cal.due =
calDue
calDue
Due date of next calibration (
0
indicates that no date is set)
X
Source-measure unit (SMU) channel (for example,
smua.cal.due
applies to
SMU channel A)
Details
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
smu
X
.cal.unlock()
function. It is typically set to the date when the next calibration should be performed.
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.
smu
X
.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,
smu
X
.cal.due
is only accurate to within a few minutes of the value set.