Keithley 2651A, Reference Manual

Page: 501 / 800

Model 2651A High Power System SourceMeter® Instrument Reference Manual Section 7: Command reference
2651A-901-01 Rev. A / March 2011 7-193
Also see
reset() (on page 7-151)
smuX.measure.nplc (on page 7-201)
setup.recall() (on page 7-170)
smuX.reset() (on page 7-209)
Autozero (on page 2-22)
smuX.measure.calibrateY()
This function generates and activates new measurement calibration constants.
Type TSP-Link accessible Affected by Where saved Default value
Function Yes
Usage
smu X .measure.calibrate Y ( range , cp1Measured , cp1Reference , cp2Measured ,
cp2Reference )
X
Source-measure unit (SMU) channel (for example,
smua.measure.calibratev()
applies to SMU channel A).
Y
SMU measurement function (
v
= voltage,
i
= current).
range
The measurement range to calibrate.
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.
Details
This function generates and activates new calibration constants for the given range. The positive and negative
polarities of the instrument must be calibrated separately. Use a positive value for
range
to calibrate the positive
polarity and a negative value for
range
to calibrate the negative polarity.
Typically the two calibration points used will be near zero for calibration point 1 and 90% of full scale 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 nonvolatile storage.
Use
smu X .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 nonvolatile storage with the
smu X .cal.restore()
function.
This function will be disabled until a successful call to
smu X .cal.unlock()
is made.
Example
smua.measure.calibratev(1, 1e-4, 1e-5, 0.92,
0.903)
SMU channel A calibrates voltage
measurement using following values: 1 V
calibration range, 1e-4 for +zero
measurement reading, 1e-5 for +zero
DMM measurement reading, 0.92 for
+FS measurement reading, and 0.903 for
the +FS DMM measurement reading.