Source & Measure 2W Voltage
Source & Measure 2W Voltage allows you to source a precision current that will be applied to the specified
Hi point while the specified Lo point is pulled to ground. After the dwell time has elapsed, the voltage on
the Hi point will be measured. You can enable either a high or low voltage limit for the measurement. A
voltage measure outside these limits will cause the test to fail.
For operator safety carefully set the Compliance Voltage, Compliance Current, and other test settings to
minimize the electrical energy in the test. See safety precautions at the beginning of this section. This
custom instruction must be preceded by an Attach 2-wire test instruction.
This instruction could be used to measure transorb threshold voltage. See the example in Source &
Measure 2W Current above.
See also NPLC and Average on page 32.
Measure 2W Resistance
Source & Measure 2W Resistance allows the Keithley meter to make very accurate resistance
measurements between two points. The Keithley meter makes the resistance measurement between two
points by autoranging and applying current to a point and sensing voltage on another point. The voltage
and current are used to calculate the resistance. You are able to establish resistance limits for the test. A
measured resistance outside a limit will cause the test to fail. Entering Delay Before Measurement value
can be used to allow the reading to stabilize.
Entering a Tare value allows you to void the resistance in fixturing to the device under test. You can also
use the Measure 4W Resistance to accurately void fixturing resistance.
The Measure 2W Resistance instruction must be preceded by an Attach 2-wire test instruction.
See also NPLC and Average on page 32.
Measure 4W Resistance
Source & Measure 4W Resistance allows the Keithley meter to make extremely accurate resistance
measurements between two points. The Keithley meter makes the resistance measurement between the
two points by applying an autoranging current source and sensing voltage. The voltage and current are
used to calculate the resistance. You are able to establish resistance limits for this test instruction. A
measured resistance outside a limit will cause the test to fail. Entering Delay Before Measurement value
can be used to allow the reading to stabilize.
Entering a tare value allows you to void the resistance in fixturing beyond the point where the 4-wire
connection is made. See also the Measure 2W Resistance instruction above and NPLC and Average on
page 32.
User Defined 2-Wire Measure
User Defined 2-Wire Measure allows you to issue SCPI compliant commands to the Keithley meter to
create your own custom test instruction. Using these SCPI commands requires much technical ability,
practice, and patience. Refer to the Keithley SourceMeters
®
Manual for more information. See also
NPLC and Average on page 32.
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