Spectrum Controls 1769sc-IF4IH User Manual page 59

User' s Manual 0300215-03 Rev. A
Chapter 4: Module Data, Status, and Configuration
Table 6-5 (Filter Frequency and Step Response)
Filter Frequency
Step Response
28.5 Hz
50 Hz
60 Hz
300 Hz
360 Hz
1
The channel update time is equal to the channel step respose.
Channel Cut-Off Frequency
The filter cut-off frequency, -3 dB, is the point on the frequency response curve where
frequency components of the input signal are passed with 3 dB of attenuation. The
following table shows cut-off frequencies for the supported filters.
Table 6-6 (Filter Frequency versus Channel Cut-off Frequency)
Filter Frequency Cut-off Frequency Rejection
28.5 Hz
50 Hz
60 Hz
300 Hz
360 Hz
All input frequency components at or below the cut-off frequency are passed by the
digital filter with less than 3 dB of attenuation. All frequency components above the cut-
off frequency are increasingly attenuated as shown in Figure 6-2 (Frequency Response).
1
108 ms
62 ms
52 ms
12 ms
10 ms
2.3 Hz 67 db @ 50/60 Hz
4.0 Hz 96 db @ 50 Hz
4.7 Hz 96 db @ 60 Hz
24 Hz
25 db @ 50 Hz
28 Hz 25 db @ 60 Hz
6-9