Keithley 2657A - Smux.contact.r()

Section 7: TSP command reference Model 2657A High Power System SourceMeter® Instrument Reference Manual
7-190 2657A-901-01 Rev. B/December 2012
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.
If you attempt to perform a contact check measurement when any of the following conditions exist, an error is
generated:
When the output is on and any of the following:
• SMU is a current source with current range set to less than 1 mA (error code 5065, "I range too low for
contact check")
• SMU is a voltage source with current limit set to less than 1 mA (error code 5050, "I limit too low for
contact check")
When the output is off and any of the following:
• The output off mode is High-Z (error code 5048, "Contact check not valid with HIGH-Z OUTPUT off")
• 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 code 5066,
"source.offlimiti too low for contact check")
• 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 code 5065, "I range too low for
contact check")
Example
if not smua.contact.check() then
-- take action
end
Takes action if contact check on SMU channel A fails.
Also see
Contact check connections (on page 2-51)
Contact check measurements
(on page 2-37)
smuX.contact.speed
(on page 7-191)
smuX.contact.threshold
(on page 7-192)
smuX.source.offfunc
(on page 7-220)
smuX.contact.r()
This function measures aggregate contact resistance.
Type TSP-Link accessible
Affected by Where saved Default value
Function Yes
Usage
rhi, rlo = smuX.contact.r()
rhi
The measured aggregate contact resistance on the HI/sense HI side
rlo
The measured aggregate contact resistance on the LO/sense LO side
X
Source-measure unit (SMU) channel (for example, smua.contact.r() applies to
SMU channel A)