Smu.measure.sense - Keithley 2450 Reference Manual

Model 2450 Interactive SourceMeter® Instrument Reference Manual

smu.measure.sense

This command selects local (2-wire) or remote (4-wire) sensing.
Type TSP-Link accessible
Attribute (RW) Yes
Usage
sensing = smu.measure.sense
smu.measure.sense = sensing
sensing
Details
This command determines if 2-wire (local) or 4-wire (remote) sensing is used.
When you use 4-wire sensing, voltages are measured at the device under test (DUT). For the source voltage, if
the sensed voltage is lower than the programmed amplitude, the voltage source increases the voltage until the
sensed voltage is the same as the programmed amplitude. This compensates for IR drop in the output test leads.
Using 4-wire sensing with voltage measurements eliminates any voltage drops that may be in the test leads
between the Model 2450 and the DUT.
When you are using 2-wire sensing, voltage is measured at the output connectors.
When you are measuring resistance, you can enable 4-wire sensing to make 4-wire resistance measurements.
When the output is off, 4-wire sensing is disabled and the instrument uses 2-wire sense, regardless of the sense
setting. When the output is on, the selected sense setting is used.
Example
smu.measure.func = smu.FUNC_RESISTANCE
smu.measure.sense = smu.SENSE_4WIRE
Also see
Two-wire local sense connections
Four-wire remote sense connections
2450-901-01 Rev. B/September 2013
Affected by
Restore configuration
Instrument reset
Power cycle
Measure configuration list
Function change
Two-wire sensing: smu.SENSE_2WIRE
Four-wire sensing: smu.SENSE_4WIRE
(on page 2-75)
(on page 2-76)
Section 8: TSP command reference
Where saved Default value
Configuration script smu.SENSE_2WIRE
Measure configuration list
Set the measurement function to resistance.
Set the sense to 4-wire remote.
8-123