2470 High Voltage SourceMeter Instrument Reference Manual
Section 14: TSP command reference
2470-901-01 Rev. A /
May
2019
14-147
smu.measure.sense
This attribute selects local (2-wire) or remote (4-wire) sensing.
Type
TSP-Link accessible
Affected by
Where saved
Default value
Attribute (RW)
Yes
Restore configuration
Instrument reset
Power cycle
Measure configuration list
Function change
Configuration script
Measure configuration list
smu.SENSE_2WIRE
Usage
sensing
= smu.measure.sense
smu.measure.sense =
sensing
sensing
Two-wire sensing:
smu.SENSE_2WIRE
Four-wire sensing:
smu.SENSE_4WIRE
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 2470 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.
If the output is on when you change the sense setting, the output is turned off.
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 4-8)
