Model 2651A High Power System SourceMeter® Instrument Reference Manual
Section 7: Command reference
2651A-901-01 Rev. A / March 2011
7-187
smuX.contact.r()
This function measures contact resistance.
Type
TSP-Link accessible
Affected by
Where saved
Default value
Function Yes
Usage
rhi
,
rlo
= smu
X
.contact.r()
rhi
The measured contact resistance on the high/sense high side
rlo
The measured contact resistance on the low/sense low side
X
Source-measure unit (SMU) channel (for example,
smua.contact.r()
applies to
SMU channel A)
Details
Attempting to perform a contact resistance measurement when any of the following conditions exist will generate
an error:
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
smua.contact.speed = smua.CONTACT_SLOW
rhi, rlo = smua.contact.r()
print(rhi, rlo)
exit()
end
Check contacts against threshold.
Set speed for SMU channel A to slow.
Get resistance readings.
Output contact resistances to the host.
Terminate execution.
Also see
(on page 7-186)
(on page 7-188)
(on page 2-45)
(on page 2-37)
