Keithley 2461 Reference Manual

Section
8: TSP command reference Model 2461 Interactive SourceMeter® Instrument
Reference Manual
8-204 2461-901-01 A/November 2015
The asymptote changes the inflection of the pulse sweep curve and allows it to sweep through zero.
You can use the asymptote parameter to customize the inflection and offset of the source value
curve. Setting this parameter to zero provides a conventional logarithmic sweep. The asymptote
value is the value that the curve has at either positive or negative infinity, depending on the direction
of the sweep. It must be outside of the range defined by the starting and ending values.
The name of the source configuration list determines the name of the measure configuration list;
Meas is appended to the beginning of the name. If the name of your configuration list is greater than
28 characters, it is truncated to include only the first 28 characters (including the prefix Meas that is
added for the measure configuration list). For example, if the source configuration list is named
VoltPulseLogarithSweepList (26 characters), the resulting measure configuration list is named
MeasVoltPulseLogarithSweepList (30 characters). If the source configuration list is named
MyLongPulseNameSweepConfigList (30 characters), the resulting measure configuration list is
MeasMyLongPulseNameSweepConfigLi (32 characters).
Example
reset()
smu.source.func = smu.FUNC_DC_VOLTAGE
smu.source.range = 100
smu.measure.func = smu.FUNC_DC_CURRENT
smu.measure.range = 1
smu.source.readback = smu.ON
smu.measure.autozero.enable = smu.ON
smu.measure.nplc = .1
smu.source.pulsesweeplog("VoltLogSweep", 0, 1, 100, 50, 20e-3, smu.ON,
defbuffer1, 0, 80e-3, 5, 1, 1)
trigger.model.initiate()
Reset the instrument to its default settings.
Set the source function to voltage and the source voltage range to 100 V.
Set the measure function to current and the measure current range to 1 A.
Turn on source readback, enable autozero and set the NPLC to 0.1.
Set up a logarithmic sweep from 1 V to 100 V in 50 steps. Set the pulse width to 20 ms, the off time to 80 ms,
and repeat the sweep five times.
Start the pulse sweep.
Also see
Pulse operation (on page 3-64)
smu.source.pulsesweeplist() (on page 8-200)

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