Keithley 2657A, Reference Manual, Page: 500 / 805

Model 2657A High Power System SourceMeter® Instrument Reference Manual Section 7: TSP command reference
2657A-901-01 Rev. B/December 2012 7-187
Also see
Adjustment (on page B-14)
smuX.cal.lock() (on page 7-181)
smuX.cal.password (on page 7-182)
smuX.cal.state (on page 7-185)
smuX.contact.calibratehi()
This function calibrates the high/sense high contact check measurement.
Type TSP-Link accessible Affected by Where saved Default value
Function
Yes
Usage
smu
X
.contact.calibratehi(
cp1Measured
,
cp1Reference
,
cp2Measured
,
cp2Reference
)
X
Source-measure unit (SMU) channel (for example,
smua.contact.calibratehi()
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 will be near 0
Ω
and 50
Ω,
respectively.
All four measurements (
cp1Measured
,
cp1Reference
,
cp2Measured
, and
cp2Reference
) must be made
with the calibration set that is active. 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 will be 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 resisters.
The user sends contact check
LO calibration command.
The user sends contact check
HI calibration command.