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© 2012 by Proceq SA
6.10 Relative frequency
With the relative frequency func-
tion, a bar graph (as show in Fig.
6.8) of the measurement data is
created. The width of the bars
represents the measurement
range while the height of the
bar represents the relative fre-
quency of measurements points
within that range. The range of
the graph can be changed by
entering the desired minimum
and maximum values in the
respective fields on the x-axis.
The limits are -1000 to +1000
mV. The class width can also be
changed.
Fig. 6.8: Relative frequency diagram
6.11 Cumulative frequency
Fig. 6.9: Cumulative frequency diagram
Following an evaluation (See 4.10), the corrosion engineer can place the 3 cursors in such a way that
they represent areas of different corrosion degrees.
They determine the colour distribution in the chipping graph.
It is possible to overlay two or even all three cursors and thereby decrease the number of divisions.
The cumulative frequency needs to be activated at least once for a newly opened file in order to be
able to view the chipping graph.
The range of the cumulative frequency graph can be changed by entering the desired minimum and
maximum values in the respective fields on the x-axis. The limits are -1000 to +1000 mV. The class
width can also be changed.
