Measurement Filtering

Introduction

The type of filtering performed by the system is called "first order filtering."

The filtering coefficient is editable from the Control Expert screen or through programming.

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 TSX AEY 800 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	100 ms 202 ms	1,591 0,788
Medium filtering	3 4	0,937 0,969	419 ms 851 ms	0,379 0,187
High filtering	5 6	0.984 0.992	1.714 ms 3.442 ms	0,093 0,046

Values for TSX AEY 1600 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	178 ms 382 ms	0,894 0,416
Medium filtering	3 4	0,937 0,969	791 ms 1.607 s	0,201 0,099
High filtering	5 6	0,984 0,992	3.239 s 6.502 s	0,049 0,024