Filtering - Renishaw XK10 Manual

XK10 Hardware XK10 Software
Flatness Level
Appendix B: Filtering
XK10 uses median filters in two ways:
1. Live median filter
The live filter smooths the raw readings from the M unit and S unit and
replaces each data point with the median of the corresponding set
of data points. The size of this set of data points is dependent on the
filtering level.
Median filter at data capture
2.
When data is captured, a sample of data is taken, and the system returns
the median value of the sample. The size of the sample is dependent on
the filtering level.
Straightness data capture
25
20
15
10
5
0
-5
0 2 4
Live raw straightness readings
154 XK10 alignment laser system
XK10 Applications Straightness
Parallelism Coaxiality
Bad data point
6 8 10
Sample number
Live filtered straightness readings
Squareness
Spindle direction
Live raw straightness readings
0
0
0.5
-0.5
20
0.5
1
0
1
1
0
12
Live filtered straightness readings
= median (0, 0, 0.5) = 0
= median (0, 0.5, -0.5) = 0
= median (0.5, -0.5, 20) = 0.5
0.5
1
0.5
1
1
1
1
0.5
www.renishaw.com/xk10
Median
filter at
data
capture