Keithley 2657A User Manual

A
ppendix B: Calibration Model 2657A High Power System SourceMeter® Instrument Reference Manual
B-30 2657A-901-01 Rev. B/December 2012
E. Allow the readings to settle, then get the Model 2657A readings:
r50_hi, r50_lo = smua.contact.r()
F. Send the contact check low calibration adjustment command:
smua.contact.calibratelo(r0_lo, Z_actual, r50_lo, 50_ohm_actual)
Where:
r0_lo
=
Model 2657A 0 Ω low measurement
Z_actual
=
Actual zero value; the resistance of the short between the SENSE LO and LO
terminals
r50_lo
=
Model 2657A 50 Ω low measurement
50_ohm_actual
=
Actual 50 Ω resistor value; the actual value of the resistor between the SENSE
LO and LO terminals
Typical values:
smua.contact.calibratelo(r0_lo, 0, r50_lo, 50.15)
Where r0_lo is the same value as measured in step B, and r50_lo is the same value as
measured in step D.
G. Send the contact check high calibration command:
smua.contact.calibratehi(r0_hi, Z_actual, r50_hi, 50_ohm_actual)
Where:
r0_hi
=
Model 2657A 0 Ω high measurement
Z_actual
=
Actual zero value; the resistance of the short between the SENSE HI and HI
terminals
r50_hi
=
Model 2657A 50 Ω high measurement
50_ohm_actual
=
Actual 50 Ω resistor value; the value of the resistor between the SENSE HI and
HI terminals
Typical values:
smua.contact.calibratehi(r0_hi, 0, r50_hi, 50.15)
Where r0_hi is the same value as measured in step B, and r50_hi is the same value as measured
in step E.
Step 6. Program calibration dates
Use the following command to set the calibration adjustment date:
smua.cal.adjustdate = os.time{year=2010, month=12, day=1}
Optionally, it is possible to set the calibration date and calibration due date with the following
commands:
smua.cal.date = os.time{year=2010, month=12, day=1}
smua.cal.due = os.time{year=2011, month=12, day=1}
If you do not wish to set a calibration date or calibration due date and want to clear the previous
values, use the following commands:
smua.cal.date = 0
smua.cal.due = 0
The actual year, month, day, and (optional) hour and minute should be used (seconds can be given
but are essentially ignored due to the precision of the internal date storage format). The allowable
range for the year is from 1970 to 2037, the month is from 1 to 12, and the day is from 1 to 31.

Keithley 2657A Specifications

General

Brand	Keithley
Model	2657A
Category	Measuring Instruments
Language	English