Tektronix Keithley 2651A Reference Manual page 146

Section 3: Functions and features
Therefore, b = 10
The log steps for this sweep are listed in the table below.
Logarithmic sweep points
Source point (N)
1
2
3
4
5
When this sweep starts, the output will go to the start level (1 V) and sweep through the symmetrical
log points.
To configure a logarithmic staircase sweep, use the smua.trigger.source.logY()function. This
function configures the source values the source-measure unit (SMU) will output when performing a
logarithmic 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 1 to 10 V in 10 steps with an asymptote of 0 V.
smua.trigger.source.logv(1, 10, 11, 0)
-- Enable the source action.
smua.trigger.source.action = smua.ENABLE
For more information, see
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.listY()function. This function
configures the source values that the source-measure unit (SMU) outputs 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 3 V, 1 V, 4 V, 5 V, and 2 V.
smua.trigger.source.listv({3, 1, 4, 5, 2})
-- Enable the source action.
smua.trigger.source.action = smua.ENABLE
3-28
Model 2651A High Power System SourceMeter® Instrument Reference Manual
(log step size)
= 1.7783
Source level (V)
1
1.7783
3.1623
5.6234
10
smuX.trigger.source.logY()
Step number (i)
0
1
2
3
4
(on page 7-304).
2651A-901-01 Rev. C October 2021