Keithley 2461 Reference Manual

Model 2461
Interactive SourceMeter® Instrument Reference Manual Section 6: SCPI command refe
rence
2461-901-01 A/November 2015 6-127
Details
When the sweep is started, the instrument sources a specific voltage or current voltage to the device
under test (DUT). A measurement is made for each point of the sweep.
When the sweep command is sent, it deletes the existing trigger model and creates a trigger model
with a uniform series of ascending or descending voltage or current changes, called steps. To run the
sweep, initiate the trigger model.
The sweep continues until the source outputs the stop level, which is calculated from the number of
steps. A measurement is performed at each source step (including the start and stop levels). At this
level, the instrument performs another measurement and then stops the sweep.
The instrument uses the step size parameter to determine the number of source level changes. The
source level changes in equal steps from the start level to the stop level. To avoid a setting conflicts
error, make sure the step size is greater than the start value and less than the stop value. To
calculate the number of source-measure points in a sweep, use the following formula:
Points = [(Stop - Start) / Step] + 1
When you specify a delay, a delay block is added to the sweep trigger model. This delay is added to
any source delay you may have set. For example, if you set 10 ms for the source delay and 25 ms for
the delay in the for the log sweep command, the actual delay is 35 ms.
The range type specifies the source range that is used for the sweep. You can select the following
options:
• Auto: The instrument automatically goes to the most sensitive source range for each source level in the
sweep.
• Best fixed: The instrument selects a single fixed source range that accommodates all the source levels
in the sweep. This avoids overshoots during sweeps.
• Fixed: The source remains on the range that is set when the sweep is started. If a sweep point that
exceeds the capability of the source range, the source outputs the maximum level for that range.
Example
*RST
SOUR:FUNC CURR
SOUR:CURR:RANGE 1
SENS:FUNC "VOLT"
SENS:VOLT:RANGE 20
SOUR:SWE:CURR:LIN:STEP -1.05, 1.05, .25, 10e-3, 1, FIXED
INIT
Reset the instrument to its defaults.
Set the source function to current.
Set the source range to 1 A. Set the measure function to voltage with a range of 20 V.
Set up a linear step sweep that sweeps from -1.05 A to 1.05 A in 0.25 A increments with a source delay of
1 ms, a sweep count of 1, and a fixed source range. The name of the configuration list that is created for this
sweep is CurrLinearSweep.
Start the sweep.
Also see
Sweep operation (on page 3-53)

Keithley 2461 Specifications

General

Maximum Current	7 A
Power	100 W
Resolution	6.5 digits
Source Measure Unit (SMU)	Yes
DC Voltage	100 V
Maximum Voltage	100 V
Display	5-inch capacitive touchscreen
Connectivity	USB, GPIB
Software	TSP
DC Current	7 A
Current Source Range	0 to 7 A
Voltage Measurement Range	100 mV to 100 V
Current Measurement Range	10 nA to 7 A
Voltage Measurement Resolution	100 nV