Measurement Filtering
(Original Document)
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Introduction
The type of filtering performed by the system is called "first order filtering." The filtering coefficient is editable from a programming console or through the program.
Mathematical Formula
The applicable mathematical formula is as follows:
where:
α = filter efficiency,
Mesf(n) = filtered measurement at time n,
Mesf(n-1) = filtered measurement at time n-1,
Valb(n) = raw value at time n.
You may configure the filtering value from 7 possibilities. This value may be changed even when the application is in RUN mode.
NOTE: Filtering is disabled in Fast Cycle mode.
Values for TSX AEY 1614 Module
Filtering values are as follows. They depend on the cycle time T:
Desired Efficiency
Required Value
α corresponding
Filter Response Time at 63%
Cut-off Frequency (in Hz)
No filtering
0
0
0
0
Low filtering
1
2
0,750
0,875
4 x T
8 x T
0.040 / T
0.020 / T
Medium filtering
3
4
0,937
0,969
16 x T
32 x T
0.010 / T
0.005 / T
High filtering
5
6
0,984
0,992
64 x T
128 x T
0.025 / T
0.012 / T