MICRO-EPSILON C-Box/2A, Руководство по эксплуатации

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Page 34
Setting Controller Parameters
C-Box/2A
Recursive average
Each new metric MW is weighted to the (n-1) value of the previous average.
Formula:
MV + (N-1) x
(n)
M
rec (n-1)
N
M (n) =
rec
MV = measured value,
N = averaging value, N = 1 ... 32768
n = measurement index
M
rec
= average value or output value
Each new measurement value MV(n) is added, as a weighted value, to the (n-1)-fold of the previous averag-
ing value.
Recursive averaging allows for very strong smoothing of the measurements, however it requires long re-
sponse times for measurement jumps. The recursive average value shows low-pass behavior.
Application tips
- Permits a high degree of smoothing of the measurement
values. However, it requires extremely long transient recov-
ery times for measured value jumps (low-pass behavior)
- Permits a high degree of smoothing for noise without
strong spikes
- For static measurements, to smooth signal noise
- For dynamic measurements on rough surfaces, to elimi-
nate the roughness, e. g. roughness of paper
- For the elimination of structures, e. g. parts with uniform
grooves, knurled rotary parts or roughly milled parts
- Unsuitable for highly dynamic measurements
Signal without averaging
Signal with averaging
Fig. 14 Recursive average, N = 8