Keithley 2601 Reference Manual page 318

Section 12: Instrument Control Library
Remarks • 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 fo
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
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 non-volatile storage. Use
nonvolatile storage. The active calibration constants will stay in effect until the
instrument is power cycled or a calibration set is loaded from non-volatile storage
with the
This function will be disabled until a successful call to
•
Details See Section 16
Also see smuX.cal.restore, smuX.cal.save, smuX.makebuffer,
smuX.measure.count
Attribute Number of measurements performed when a measurement is requested.
Usage
count = smuX.measure.count
smuX.measure.count = count
count
Remarks • This attribute controls the number of measurements taken any time a measurement is
requested. When using a reading buffer with a measure command, the count also
controls the number of readings to be stored.
The
•
reset
Details See "Triggering" in
Also see smuX.measure.overlappedY,
Sets measure count for SMU A:
Example
smua.measure.count = 10
smuX.measure.delay
Attribute Controls the measurement delay.
Usage
mdelay = smuX.measure.delay
smuX.measure.delay = mdelay
Set mdelay to one of the following values:
0 or smuX.DELAY_OFF
-1 or smux.DELAY_AUTO
user_value
Remarks • This attribute allows for additional settling time before taking a measurement.
• The default is smuX.DELAY_AUTO.
• The smuX.DELAY_AUTO setting causes a current range-dependent delay to be inserted
when a current measurement function is called.
• If smuX.measure.count is greater than 1, the measurement delay is only inserted
before the first measurement.
• mdelay can be set to a specific user-defined value that sets the delay that is used
regardless of range.
• Use smuX.source.delay when measuring your source (source read back) and
smuX.measure.delay when stepping voltage and measuring current.
Also see smuX.measure.delayfactor,
Example
smua.measure.delay = 0.010
12-58
r to
calibrate the positive polarity and a negative value fo
range
function.
smuX.cal.restore
"Calibration".
X = SMU channel (a or b)
function sets the measure count to 1.
Section 10.
smuX.measure.Y
X= SMU channel (a or b)
(Models 2635 and 2636 only)
No delay.
Automatic delay value.
Set user delay value.
smuX.source.delay
Return to
Series 2600 System SourceMeter® Instruments Reference Manual
, ,
cp2measured, and
cp1reference
to commit the new constants to
smuX.cal.save
smuX.cal.unlock
smuX.source.calibrateY
-- Reads measure count.
-- Writes measure count.
Number of measurements .
-- Read the measure delay.
-- Write the measure delay.
Sets the measurement delay to 10mS.
Section Topics
r
range
is made.
2600S-901-01 Rev. C / January 2008