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P a g e
R e v 5 - 1 9
PA Settings
Peak Analysis values can be changed as follows:
Peak Tolerance:
This is the amount of acceptable
variation in percentage between the final estimated
thickness by the peak analysis algorithm and the
thickness displayed by the software. If a value of 0.2 is
used in this field, then a 20% variation is acceptable
between the calculated thickness by the software and
the estimated thickness by the peak analysis. If the
variation is more than what is acceptable as defined by
the acceptance tolerance value, then the software will
flag the measurement as a “No Read.” The typical range
for this parameter is 0.1 to 0.5.
Fringe Variance:
This is the amount of variation allowed
in thickness between the calculated thickness and
individual peak estimates. (See Section 9 for an example
of estimating thickness using peak estimate tool. The
default value is 0.3. Depending on the nature of the
samples and the quality of interference, this parameter might have to be modified.
Height Threshold:
This is the minimum amount of height (distance from the bottom point to the top
point for a given interference wave) that is required to consider the interference wave as valid.
Custom Smoothing:
Attempts to “smooth” the spectral data curve as the value increases to fit the
original interference curve better.