Section 7: TSP command reference
Series 2600B System SourceMeter® Instrument Reference Manual
7-208
2600BS-901-01 Rev. C / August 2016
smuX.contact.calibratelo()
This function calibrates the low/sense low contact check measurement. This function is not available on the
Models 2604B/2614B/2634B.
Type
TSP-Link accessible
Affected by
Where saved
Default value
Function
Yes
Usage
smu
X
.contact.calibratelo(
cp1Measured
,
cp1Reference
,
cp2Measured
,
cp2Reference
)
X
Source-measure unit (SMU) channel (for example,
smua.contact.calibratelo()
applies to SMU channel A)
cp1Measured
The value measured by this SMU for calibration point 1
cp1Reference
The reference measurement for calibration point 1 as measured externally
cp2Measured
The value measured by this SMU for calibration point 2
cp2Reference
The reference measurement for calibration point 2 as measured externally
Details
Contact check measurement calibration does not require range information.
Typically, calibration points one and two are near 0
Ω
and 50
Ω,
respectively.
All four measurements (
cp1Measured
,
cp1Reference
,
cp2Measured
, and
cp2Reference
) must
be made with the active calibration set. If not, corruption of the calibration constants may result.
The new calibration constants are activated immediately but are not written to nonvolatile memory.
Use
smu
X
.cal.save()
to save the new constants to nonvolatile memory. The active calibration
constants stay in effect until the instrument is power cycled or a calibration set is loaded from
nonvolatile memory with the
smu
X
.cal.restore()
function.
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)
Performs contact
check on SMU
channel A.
Install and measure
two resisters.
The user sends
contact check LO
calibration
command.
The user sends
contact check HI
calibration
command.