Model 2601B-PULSE System SourceMeter Instrument Reference Manual Section 11: TSP command reference
2601B-PULSE-901-01A April 2020 11-257
The points parameter does not set the number of steps in a sweep, but rather is used to calculate
source values within a subsequent sweep. If the subsequent sweep has more points than specified in
points, the source restarts at the beginning. This means that if the trigger count is greater than the
number of points in a sweep as configured, the SMU satisfies the trigger count by restarting the
sweep values from the beginning.
If the subsequent sweep has fewer points than specified in points, endValue is not reached during
the sweep. This means that if the trigger count is less than the number of source values configured,
the SMU satisfies the trigger count and ignores the remaining source values.
In cases where the first sweep point is nonzero, it may be necessary to pre-charge the circuit so that
the sweep returns a stable value for the first measured point without penalizing remaining points in
the sweep.
With logarithmic sweeps, it is usually necessary to allow the source to autorange to maintain good
source accuracy when sweeping over more than one decade or across range boundaries.
The asymptote parameter can be used to customize the inflection and offset of the source value
curve. This allows log sweeps to cross zero. 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.
The asymptote value must not be equal to or between the starting and ending values. It must be
outside the range defined by the starting and ending values.
The SMU stores only the most recent configured source action. The last call to
smua.trigger.source.linearY(), smua.trigger.source.listY(), or
smua.trigger.source.logY() is used for the source action.
Source functions cannot be changed within a sweep.
After configuring the sweep source values, enable the source action by setting
smua.trigger.source.action.
Example
smua.trigger.source.logv(1, 10, 11, 0)
Sweeps from 1 V to 10 V in 10 steps with an
asymptote of 0 V.
Also see
smua.trigger.source.action (on page 11-253)
smua.trigger.source.linearY() (on page 11-254)
smua.trigger.source.listY() (on page 11-255)
Sweep operation (on page 4-61)
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