Keithley 2600a series, Reference Manual, Page: 431 / 696

2600AS-901-01 Rev. B / September 2008 Return to Section Topics 19-109
Series 2600A System SourceMeter® Instruments Reference Manual Section 19: Remote Commands
smuX.contact.calibratelo X = SMU channel (a or b)
Function Calibrate the low/sense low contact check measurement.
TSP-Link
accessibility
This function can be accessed from a remote TSP-Link node.
Usage
smuX.contact.calibratelo(cp1measured, cp1reference, cp2measured,
cp2reference)
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.
Remarks • Contact check measurement calibration does not require range information.
• Typically the two calibration points used will be near 0
Ω
for calibration point 1 and 50
Ω
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
smuX.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
smuX.cal.restore
function.
• This function will be disabled until a successful call to
smuX.cal.unlock
is made.
Details See Section 20 .
Also see
smuX.contact.calibratehi
smuX.contact.check X = SMU channel (a or b)
Function Determine if contact resistance is lower than the threshold.
TSP-Link
accessibility
This function can be accessed from a remote TSP-Link node.
Usage
flag = smuX.contact.check()
flag
Indicates whether contact resistance is lower than the
threshold.
Remarks • This function returns
true
if the contact resistance is below the threshold, and
false
if it is
above the threshold.
• Attempting to perform a contact check measurement when any of the following
conditions exist will generate an error:
•
Output is off in High-Z mode.
• Current limit set to less than 1mA.
Details See Section 2 for connections.
Also see
smuX.contact.threshold , smuX.contact.speed
Example Takes action if contact check on SMU A fails:
if (not smua.contact.check()) then
-- take action
end