Keithley 2657A, Справочное руководство, Страница: 140 / 805

Section 3: Functions and features Model 2657A High Power System SourceMeter® Instrument Reference Manual
3-26 2657A-901-01 Rev. B/December 2012
List sweeps
Use a list sweep to configure a sweep with arbitrary steps. When enabled, a measurement is made at
each point after source and measurement settling time.
To configure a list sweep, use the
smua.trigger.source.list
Y
()
function. This function
configures the source values that the source-measure unit (SMU) will output when performing a list
sweep. After configuring the sweep, you must also enable the source action by setting the
smua.trigger.source.action
attribute.
Example:
-- Sweep through 30 V, 20 V, 40 V, 50 V, and 20 V.
smua.trigger.source.listv({30, 20, 40, 50, 20})
-- Enable the source action.
smua.trigger.source.action = smua.ENABLE
When the sweep is started, the output level goes to the first point in the sweep. The sweep will
continue through the steps in the order that they were programmed.
The following figure shows a different example of a list sweep with six measurement points. When the
sweep starts, the current or voltage goes to the first point in the sweep. The unit cycles through the
sweep points in the programmed order.
Figure 38: List sweep example
Pulse mode sweeps
A pulse mode sweep can be created for any of the sweep types by configuring the end pulse action.
To configure a pulse mode sweep for source-measure unit (SMU) A, send:
smua.trigger.endpulse.action = smua.SOURCE_IDLE
To configure a DC sweep for SMU A, send:
smua.trigger.endpulse.action = smua.SOURCE_HOLD
Measure
#1
Measure
#2
Measure
#3
Measure
#4
Measure
#5
Measure
#6
Delay
X
X
X
X
X
X
X = Measurement point