Measurement Filter Configuration - Hach ORBISPHERE G1100 User Manual

Measurement Menu

6.2.3 Measurement filter configuration

Example for depth 7, central depth 5:
•
Sorted values, both ends eliminated, the average of the center five is then 3.88.
Example for depth 5, central depth 3:
•
Sorted values, both ends eliminated, the average of the center three is then 4.23.
Example for depth 8, central depth 4:
•
Sorted values, both ends eliminated, the average of the center four is then 4.43.
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The filters are aimed at "flattening" the measurement curve in
situations where the process shows atypical peak values that
could otherwise hamper the interpretation of measurement
readings. The filter is applied on the last set of measurements
each time a measurement is taken.
Mean: Mathematical average of the last set (depth) of
•
measurement values.
Median filter: Allows for eliminating atypical peak
•
measurement values, and average the remaining ones.
The calculation sorts the last measurements set (depth) by
values, then delete the highest and lowest values, and
averages the remaining values (central depth).
0.7
1.1 4.0 4.3
1.1
4.0 4.3
0.7 1.1
4.0 4.3
7.0
4.4 5.6
5.6
4.4
5.6 7.0
4.4 5