MICRO-EPSILON CS02 - Measurement Averaging

Page 49
Operation
capaNCDT 6200
5.5 Measurement Averaging
5.5.1 Introduction
Measurement averaging is performed before the output of measuring values via the Ethernet interfaces.
Measurement averaging improves the resolution, allows masking individual interference points or “smoothes”
the reading.
i
Linearity is not affected by averaging. Averaging has no effect on measuring frequency and output rate.
The controller is delivered ex factory without measurement averaging.
5.5.2 Moving Average
The definable number N for successive measurements (window width) is used to calculate the arithmetic
average M
mov
according to the following formula:
MV (k)
k=1
N
N
M =
mov
∑
MV = Measuring value
N = Number
k = Continuous index
M
mov
= Average value
Fig. 22 Formula for the moving average
Method
Each new measured value is added, and the first (oldest) value is removed from the averaging.
Example with N = 7:
.... 0 1 2 3 4 5 6 7 8
gets to
2+3+4+5+6+7+8
7
Average value n
.... 1 2 3 4 5 6 7 8 9
gets to
3+4+5+6+7+8+9
7
Average value n +1