6
ANALYSIS OPERATION
6.12.4 Differentiate
The displayed graph data is differentiated.
Calculation
A differentiation method is selected in this frame. The available differentiations are as
follow:
Operation
Description
dI/dV
1st derivative by the Savitzky-Golay method
dlnI/dlnV
Normalised result of the dI/dV
d2I/d2V
2nd derivative by the Savitzky-Golay method
d2lnI/d2lnV
Normalised result of the d2lnI/d(lnV)2 is
normalized by V/I.
Data Width
The number of data to be used for the Savitzky-Golay method is specified in this
input-box.
6.12.5 Remove DC Bias
All the Y values are averaged, and the result is subtracted from each Y value.
Select Remove DC Bias from the Process pull-down menu.
The operation is performed, and the processed result is displayed.
Remove DC Bias
(Average is assumed
to be 2.5)
Tip offset
Current (displayed)
graph
Y
X
—10
—5
5
10
Y
X
—10
—5
5
10
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