Keithley 2651A, Reference Manual

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Section 7: Command reference Model 2651A High Power System SourceMeter® Instrument Reference Manual
7-186 2651A-901-01 Rev. A / March 2011
smuX.contact.check()
This function determines if contact resistance is lower than the threshold.
Type TSP-Link accessible Affected by Where saved Default value
Function Yes
Usage
smu X .contact.check()
X
Source-measure unit (SMU) channel (for example,
smua.contact.check()
applies to SMU channel A).
Details
This function returns
true
if the contact resistance is below the threshold; this function returns
false
if it is
above the threshold. The threshold value is set by the
smu X .contact.threshold
attribute.
Attempting to perform a contact check measurement when any of the following conditions exist will generate
errors:
When output is on and any of the following:
•
SMU is a current source with current range set to less than 1 mA (error number 5065)
•
SMU is a voltage source with current limit set to less than 1 mA (error number 5050)
When output is off and any of the following:
•
The output off mode is High-Z (error number 5048)
• The output off mode is Normal with the
smu X .source.offfunc
attribute set to
smu X .OUTPUT_DCVOLTS
and the off current limit set to less than 1 mA (error number 5066)
•
The output off mode is Normal with the
smu X .source.offfunc
attribute set to
smu X .OUTPUT_DCAMPS
and the source range is less than 1 mA (error number 5065)
Example
if not smua.contact.check() then
-- take action
end
Takes action if contact check on SMU channel A fails.
Also see
smuX.contact.speed (on page 7-188)
smuX.contact.threshold (on page 7-189)
smuX.source.offfunc (on page 7-218)
Contact check connections (on page 2-45)
Contact check measurements (on page 2-37)