Arithmetic Average Value; Median; Dynamic Noise Rejection - MICRO-EPSILON capaNCDT 6228 Operating Instructions Manual

Operation
5.5.3
The arithmetic average value M is set and output over the selected number N of successive measuring val-
ues.
Method
Measuring values are collected and the average value is calculated consequently. This method leads to a
reduction of the amount of data, because an average value is output only after every Nth measuring value.
Example with N = 3:
.... 0 1 2 3 4 ...
.... 3 4 5 6 7 ...
5.5.4
A median value is formed from a preselected number of measurements. For this, the incoming values are
sorted after each measurement. Then, the average value is provided as the median value.
If a even value is selected for the average number N, middle both measuring values are added and divided
by two.
Example with N = 7:
5.5.5
This filter removes the noise of the measurement signal completely, but keeps the original bandwidth of the
measurement signal.
For that purpose the signal noise is calculated dynamically and measurement changes are only transferred, if
they exceed this calculated noise. Thereby at a change in direction of the measurement signal small hyster-
esis effects in the size of the calculated noise can occur.
capaNCDT 6228 / 6238

Arithmetic Average Value

2+3+4
gets to
3
5+6+7
gets to
3

Median

Sorted measuring value
Sorted measuring value

Dynamic Noise Rejection

Average value n
Average value n + 1
Median
Median
= 2
n
= 3
n+1
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