Interactive SourceMeter® Instrument Reference Manual Section 8:
2450-901-01 Rev. B/September 2013 8-123
smu.measure.sense
This command selects local (2-wire) or remote (4-wire) sensing.
Type TSP-Link accessible Affected by Where saved Default value
Instrument reset
Power cycle
Measure configuration list
Function change
Measure configuration list
Usage
sensing = smu.measure.sense
smu.measure.sense = sensing
Two-wire sensing: smu.SENSE_2WIRE
Four-wire 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
Set the measurement function to resistance.
Set the sense to 4-wire remote.
Also see
Two-wire local sense connections (on page 2-75)
Four-wire remote sense connections (on page 2-76)
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