Spectrum Controls 1769sc-IF4IH User Manual page 60

6-10
Compact IO™ Isolated HART Analog Input Module
Figure 6-2 (Frequency Response)
0
0
-20
-40
-60
-80
-100
-120
0
0
-20
-40
-60
-80
-100
-120
0
0
-20
-40
-60
-80
-100
-120
User' s Manual 0300215-03 Rev. A
28.5Hz Filter
10 20 30 40 50 60
60Hz Filter Ope ration
50 100
360Hz Filter Operation
200 400 600 800
The cut-off frequency for each channel is defined by its filter frequency selection. Choose
a filter frequency so that your fastest changing signal is below that of the filter's cut-off
frequency. The cut-off frequency should not be confused with the update time. The cut-
off frequency relates to how the digital filter attenuates frequency components of the
input signal.
The update time defines the rate at which an input channel is scanned and its channel data
word is updated.
0
0
70 80 90
-20
-40
-60
-80
-100
-120
0
0
150 200
-20
-40
-60
-80
-100
-120
1000 1200
50 Hz Filter
20 40 60 80 100
300Hz Filter Operation
200 400 600
120 140 160
800 1000