Rockwell Automation 1746-NT8 SLC 500 Thermocouple/mV Analog Input Module User Manual - Manual (Page 36)

Publication 1746-UM022B-EN-P - January 2005
3-6 Considerations Before Using Your Module
Signal Attenuation with 60 Hz Input Filter
Signal Attenuation with 250 Hz Input Filter
Channel Step Response
The channel filter frequency determines the channel’s step response.
The step response is time required for the analog input signal to reach
95% of its expected, final value given a full-scale step change in the
input signal. This means that if an input signal changes faster than the
channel step response, a portion of that signal will be attenuated by
the channel filter. The table on page 3-4 shows the step response for
each filter frequency.
0
-20
-40
-60
-80
-100
-120
-140
-160
-180
-200
0 60 120 180 240 300 360 Hz
-3 dB
15.7 Hz Signal Frequency
Amplitude (in dB)
0
-20
-40
-60
-80
-100
-120
-140
-160
-180
-200
0 250 500 750 1000 1250 1500 Hz
-3 dB
Amplitude (in dB)
Signal Frequency 65.5 Hz