Measurement Filtering

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 :

= 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.

User configures the filtering value from 7 possibilities. This value may be changed even when application is in RUN mode.

NOTE: Filtering is disabled in Fast Cycle mode.

Values for the TSX AEY 810 Module

Filtering values are as follows:

Desired Efficiency	Required Value	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	104.3 ms 224.7 ms	1,526 0,708
Medium filtering	3 4	0,937 0,969	464.8 ms 944.9 ms	0,342 0,168
High filtering	5 6	0,984 0,992	1.905 ms 3.825 ms	0,084 0,042