Model 2601B-PULSE System SourceMeter Instrument Reference Manual Section 4: Sourcing and measuring
2601B-PULSE-901-01A April 2020 4-65
To configure a linear staircase sweep, use smua.trigger.source.linearY(). This function
configures the source values the SMU will output when performing a linear sweep. After configuring
the sweep, you must also enable the source action by setting the following attribute:
smua.trigger.source.action
Example:
-- Configure a sweep from 0 to 10 V in 1 V steps.
smua.trigger.source.linearv(0, 10, 11)
-- Enable the source action.
smua.trigger.source.action = smua.ENABLE
For more information, see smua.trigger.source.linearY() (on page 11-254).
Logarithmic staircase sweeps
This type of sweep is similar to the linear staircase sweep. The steps, however, are done on a
logarithmic scale.
Like a linear staircase sweep, logarithmic sweeps are configured using a start level, a stop level, and
the number of points. The step size is determined by the start and stop levels, and the number of
sweep points. However, in a logarithmic sweep, the step size increases or decreases exponentially.
To create an increasing logarithmic sweep, set the stop value to be greater than the start value. To
create a decreasing logarithmic sweep, set the stop value to be less than the start value. When
enabled, a measurement is made at each step after source and measurement settling time. An
asymptote can also be used to control the inflection of a sweep.
The number of sweep steps actually performed is determined by the trigger count. See Triggering
(on page 6-1) for more information.
The formula for a logarithmic sweep is:
v
i
= A + kb
i
Where:
= The source value at source point i
= The index of points in the sweep (ranges from 0 to N-1)
= The number of points in the sweep
= The initial source value as an offset from the asymptote
The asymptote is used to change the inflection of the sweep curve and allow it to sweep through zero.
Both of the following figures depict the effect of the asymptote on the inflection of the sweep curve.
The following two figures show sample sweeps.
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