Keithley 2657A, Reference Manual, Page: 510 / 805

Model 2657A High Power System SourceMeter® Instrument Reference Manual Section 7: TSP command reference
2657A-901-01 Rev. B/December 2012 7-197
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 that are used are 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 calibration set that is active. Corruption of the calibration constants may result if this is ignored.
The new calibration constants are activated immediately but they are not written to nonvolatile memory. Use
smu
X
.cal.save()
to save the new constants to nonvolatile memory. The active calibration constants stay in
effect until the instrument is power cycled or a calibration set is loaded from nonvolatile memory with the
smu
X
.cal.restore()
function.
This function is disabled until a successful call to
smu
X
.cal.unlock()
is made.
Example
smua.measure.calibratev(200, 1e-4, 1e-5, 178.8,
179.8)
SMU channel A calibrates voltage
measurement using following values:
200 V calibration range, 1e-4 for +zero
measurement reading, 1e-5 for +zero
DMM measurement reading, 178.8 for
+FS measurement reading, and 179.8
for the +FS DMM measurement reading.
Also see
Adjustment (on page B-14)
smuX.cal.lock() (on page 7-181)
smuX.cal.restore() (on page 7-184)
smuX.cal.save() (on page 7-185)
smuX.cal.unlock() (on page 7-186)
smuX.source.calibrateY() (on page 7-213)
smuX.measure.count
This attribute sets the number of measurements performed when a measurement is requested.
Type TSP-Link accessible Affected by Where saved Default value
Attribute (RW) Yes Instrument reset
SMU reset
Recall setup Saved setup 1
Usage
count
= smu
X
.measure.count
smu
X
.measure.count =
count
count
Number of measurements
X
Source-measure unit (SMU) channel (for example,
smua.measure.count
applies
to SMU channel A)