3-4
Chapter 3: Configuring the 1746sc-INI4I
User’s Manual Pub. 0300128-04 Rev. A
time, as shown in the following tables.
Table 3-1. Cutoff Frequency, Step Response Time, and Effective Resolution
(Based on Filter Frequency)
Worst-Case Effective Resolution
Filter
3dB Cutoff Full-Scale
Step
Response
Voltage
Mode
Current
Mode
50 Hz
13.1 Hz
80 ms
12 bits
11 bits
60
15.7
66.7
12
11
250
65.5
16
11.5
10.5
500
131
8
9.5
9.5
Table 3-2 Channel Update Time (Based on Number of Channels Enabled and
Filter Frequency)
Filter Frequency
Number
of
channels
enabled
50 Hz
60 Hz
250 Hz
500 Hz
Current Input
1
20.0 ms
16.6 ms
4.0 ms
4.1 ms
2
20.5
17.7
7.3
7.3
3
19.8
16.6
10.6
10.7
4
21.0
17.0
13.8
13.8
2
20.5
17.7
7.3
7.3
Voltage Input
(-INI4vi only)
1
19.7 ms
16.6 ms
5.0 ms
5.0 ms
2
19.7
17.2
9.2
9.2
3
19.7
16.6
13.5
13.5
4
19.7
18.0
18.0
18.0
The 3 dB cutoff frequency is the frequency at which input signals are passed with
3 dB of attenuation.
Choose a filter frequency so that the frequency of your fastest changing signal is
lower than that filter’s 3 dB cut-off frequency. All frequency components above
the 3 dB cut-off frequency are increasingly attenuated, as shown in the following
figures.
1
For a 16-bit device like the 1746sc-INI4i and -INI4vi, a worst-case effective resolution of 12 bits means
that the data may fluctuate by as much as 16 counts (4 bits). Typically, the effective resolution is greater
than that listed here
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