Model 2657A High Power System SourceMeter® Instrument Reference Manual
Section 3: Functions and features
2657A-901-01 Rev. B/December 2012
3-25
In this example:
A
= 0,
V
start
= 100,
V
end
= 1000,
N
= 5
Using the formula above,
k
= 1
Step size (
b
) for the sweep in the above figure is calculated as follows:
Figure 37: Logarithmic staircase sweeps (2)
Therefore,
b = 10
(log step size)
= 1.7783
The five log steps for this sweep are listed in the Logarithmic sweep points table below.
Logarithmic sweep points
Source point (N) Source
level
(V) Step
number
(i)
1 100
0
2 177.83
1
3 316.23
2
4 562.34
3
5 1000
4
When this sweep starts, the output will go to the start level (100 V) and sweep through the
symmetrical log points.
To configure a logarithmic staircase sweep, use the
smua.trigger.source.log
Y
()
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 100 to 1000 V in 10 steps with an asymptote of 0 V.
smua.trigger.source.logv(100, 1000, 11, 0)
-- Enable the source action.
smua.trigger.source.action = smua.ENABLE
For more information, see
(on page 7-244).
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