Smu.measure.offsetcompensation - Keithley 2450 Reference Manual

Model 2450 Interactive SourceMeter® Instrument Reference Manual

smu.measure.offsetcompensation

This command enables or disables offset compensation for resistance measurements.
Type TSP-Link accessible
Attribute (RW) Yes
Usage
state = smu.measure.offsetcompensation
smu.measure.offsetcompensation = state
state
Details
The voltage offsets because of the presence of thermal EMFs (V
measurement accuracy. To overcome these offset voltages, you can use offset-compensated ohms.
This feature is only available for resistance measurements.
Example
smu.measure.func = smu.FUNC_RESISTANCE
smu.measure.sense = smu.SENSE_4WIRE
smu.measure.offsetcompensation = smu.ON
smu.source.output = smu.ON
print(smu.measure.read())
smu.source.output = smu.OFF
Also see
None
smu.measure.range
This attribute contains the positive full-scale value of the measurement range for the selected measurement
function.
Type TSP-Link accessible
Attribute (RW) Yes
Usage
rangeValue = smu.measure.range
smu.measure.range = rangeValue
rangeValue
2450-901-01 Rev. B/September 2013
Affected by
Restore configuration
Instrument reset
Power cycle
Measure configuration list
Enable offset compensation: smu.ON
Disable offset compensation: smu.OFF
Affected by Where saved
Restore configuration Configuration script
Instrument reset Measure configuration list
Power cycle
Measure configuration list
Function change
Set to the maximum expected value to be measured
Section 8: TSP command reference
Where saved Default value
Configuration script smu.OFF
Measure configuration list
) can adversely affect resistance
EMF
Sets the measurement function to
resistance. Set the instrument for 4-wire
measurements and turn offset compensation
on. Turn on the source, make a
measurement, and turn the source off. An
example output is:
81592000
Default value
Current: 1e-06
Resistance: 200000
Voltage: 20
8-117