Commissioning
EL3182
109
Version: 1.2
Fig. 109: Attenuation curve notch.filter at 50 Hz
Filter data for FIR filter (1 to 4-channel terminals)
Filter
Attenuation
Limit frequency (-3 dB)
Conversion time
50 Hz FIR
> 50 dB
22 Hz
625 µs
60 Hz FIR
> 45 dB
26 Hz
521 µs
IIR filter
The filter with IIR characteristic is a time-discrete, linear, time-invariant low-pass filter of 1st order (-20dB/
decade), which can be adjusted in 8 levels, i.e. cut-off frequencies. (level 1 = weak recursive filter, up to level
8 = strong recursive filter).
The IIR can be understood to be a moving average value calculation after a low-pass filter.
Through the synchronization mode
FreeRun
the IIR filter operates with an internal cycle time of 180 µs (1 or
2 channels) or 500 µs (4 channels).
IIR filter
EL31x1, EL31x2, sampling time 180 µs
EL31x4, sampling time 500 µs
Limit frequency (-3 dB)
Limit frequency (-3 dB)
IIR 1
1 kHz
400 Hz
IIR 2
500 Hz
220 Hz
IIR 3
285 Hz
100 Hz
IIR 4
142 Hz
50 Hz
IIR 5
66 Hz
24 Hz
IIR 6
33 Hz
12 Hz
IIR 7
17 Hz
6.2 Hz
IIR 8
8.2 Hz
3.0 Hz
