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What's the detail meaning of M241 AI catriage TMC4AI2 filter level?

The numerical filtering function configurable for every input channel is a low pass first order.
The mathematic formula used is:
 Measn =  K * Measn-1 + (1- K) * Valn
 With:     K is the filter efficiency,
Measn is the filtered measure at time n,
            Measn-1 is the filtered measure at time n-1,
                         Valn is the actual input value measured at time n.
 The sample time (from time n-1 to time n) is about 10ms.
 
Filter efficiency Filter Level Corresponding  K value
No filtering 0 0
Smooth filtering 1
2
0,750
0,875
Average filtering 3
4
0,937
0,969
High filtering 5
6
0,984
0,992
 
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