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Set Sensor Parameter
optoNCDT 1420
7.4.8.2 Moving average
The selected number N of successive measurement values (window width) is used to generate the arithmetic
average value M
gl
on the basis of the following formula:
MV (k)
k=1
N
N
M =
gl
MV = Measurement value,
N = Averaging number,
k = Running index
M
gl
= Averaging value respectively output value
Mode:
Each new measurement value is added and the first (oldest) measurement value from the averaging process
(from the window) taken out again. This results in short transient recovery times for jumps in measurement
values.
Example with N = 4
... 0, 1, 2, 2, 1, 3
2, 2, 1, 3
4
= M (n)
gl
... 1, 2, 2, 1, 3, 4
2, 1, 3, 4
4
= M (n+1)
gl
Measurement values
Output value
Characteristics:
When moving averaging in the optoNCDT 1420 only powers of 2 for the averaging number N are allowed.
Range of values for number of average N is 1 / 2 / 4 / 8 ... 128.
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