Keithley 2651A

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
smuX.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 smuX.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 smuX.source.offfunc attribute set to
smuX.OUTPUT_DCVOLTS and the off current limit set to less than 1 mA (error number 5066)
• The output off mode is Normal with the smuX.source.offfunc attribute set to
smuX.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)