Section 2: General operation
Model 2450 Interactive SourceMeter® Instrument Reference Manual
2-76
2450-901-01 Rev. B/September 2013
Using the front panel:
1. Press the
FUNCTION
key.
2. Select the source and measurement combination.
3. Press the
MENU
key.
4. Under Measure, select
Settings
.
5. Select the button next to Sense Mode and select
2-Wire Sense
.
6. Press the
HOME
key to return to the operating display.
Using SCPI commands:
To change to 2-wire sensing for current measurements, send the command:
:SENSe:CURRent:RSENse OFF
To change to 2-wire sensing for voltage, replace
CURRent
with
VOLTage
. For resistance, replace
CURRent
with
RESistance
.
Using TSP commands:
For voltage measurements, send the commands:
smu.measure.func = smu.FUNC_DC_VOLTAGE
smu.measure.sense = smu.SENSE_2WIRE
To assign a different measurement function, replace
smu.FUNC_DC_VOLTAGE
with one of the
following:
•
For current measurements:
smu.FUNC_DC_CURRENT
•
For resistance measurements:
smu.FUNC_RESISTANCE
Four-wire remote sense connections
Using 4-wire remote sense connections provides the most accurate low resistance, voltage source,
and measurement accuracy. Specified accuracies for instrument source and measurement
capabilities are only guaranteed when you use 4-wire remote sensing.
If you use 4-wire remote sensing when you source voltage, the programmed voltage is delivered to
the device under test (DUT). If you use 4-wire remote sensing when you source current and measure
voltage, only the voltage drop across the DUT is measured.
To make 4-wire measurements, you must set the sense mode of the instrument to 4-wire, as
described in the following topics.
When you are sourcing voltage in 4-wire remote sense, connect the sense leads to the DUT. If a
sense lead is disconnected, the instrument senses 0 V, which causes it to increase the output
voltage to compensate. To further protect against overvoltage situations, you can set overvoltage
protection. See
(on page 2-98) for more information.
