Keithley 2606B System SourceMeter, Справочное руководство, Страница: 471 / 756

2606B System SourceMeter® Instrument Reference Manual Section 7: TSP command reference
2606B-901-01 Rev. B / May 2018 7-187
This function is disabled until a successful call to
smu X .cal.unlock()
is made.
Example
-- Short SENSE LO and LO terminals
-- Short SENSE HI and HI terminals
-- Allow readings to settle, then get measurements
r0_hi, r0_lo = smua.contact.r()
-- Connect 50 OHM resistor between SENSE LO and LO
-- Connect 50 OHM resistor between SENSE HI and HI
-- Allow readings to settle, then get measurements
r50_hi, r50_lo = smua.contact.r()
smua.contact.calibratelo(r0_lo, Z_actual_lo, r50_lo, 50_ohm_actual_lo)
smua.contact.calibratehi(r0_hi, Z_actual_hi, r50_hi, 50_ohm_actual_hi)
The instrument performs a contact check on SMU channel A.
Install and measure two resistors.
The user sends the contact check LO calibration command.
The user sends the contact check HI calibration command.
Also see
Adjustment (on page B-10)
smuX.cal.restore() (on page 7-182)
smuX.cal.save() (on page 7-183)
smuX.cal.unlock() (on page 7-184)
smuX.contact.calibratehi() (on page 7-185)
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.
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")