Tektronix KEITHLEY SourceMeter 2606B Reference Manual page 141

Section 5: Sourcing and measuring
In this example:
A = 0, V = 1, V
start
Using the formula above, k = 1
Step size (b) for the sweep in the above figure is calculated as follows:
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 goes to the start level (1 V) and sweeps through the symmetrical
log points.
To configure a logarithmic staircase sweep, use the smuX.trigger.source.logY()function. This
function configures the source values the source-measure unit (SMU) outputs when performing a
logarithmic sweep. After configuring the sweep, you must also enable the source action by setting the
smuX.trigger.source.action attribute.
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
5-40
Model 2606B System SourceMeter® Instrument Reference Manual
= 10, N = 5
end
(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 15-267).
2606B-901-01 Rev. C November 2021