Device filter

The
Device filter
 setting allows configuration of the 3dB frequency of the filter in the A/D converters. This selection affects the -3dB frequency, the 50 Hz rejection, the 60 Hz rejection, the effective resolution, and the minimum sample time (RTS) as shown in the following table. This table is for information purposes only:
TIP:
The effective resolution is over a current range of 0-21 mA and applies to both the 0-20 mA and 4-20 mA range configuration settings.
Device Filter Selection
1
15 Hz
20 Hz
50 Hz
60 Hz
100 Hz
250 Hz
1000 Hz
Channel ADC Update Rate
1
50 SPS
60 SPS
150 SPS
150 SPS
300 SPS
960 SPS
4800 SPS
3 dB Point (Hz)
11.5
13.8
34.5
34.5
69
221
1104
50 Hz Common Rejection (dB)
100
60
10
10
2
.1
n/a
60 Hz Common Rejection (dB)
100
2
100
10
10
2
.1
n/a
50 Hz Normal Rejection (dB)
74
50
5
5
n/a
n/a
n/a
60 Hz Normal Rejection (dB)
74
2
97
5
5
n/a
n/a
n/a
Effective Resolution (Bits)
18
18
17
17
16
16
15
Effective Resolution (Current)
0.08uA
0.08uA
0.16uA
0.16uA
0.32uA
0.32uA
0.64uA
Settling Time (ms)
80
66.7
26.7
26.7
13.3
4.17
0.83
Minimum Sample Time
3
(RTS msec)
328
275
115
115
61
25
11
1
 These are approximate to the 3dB point and intended to be similar to the IF8H device.
2
 REJ60 bit set to one.
3
 RTS Times are slightly longer than IF8H values because of sync 4 filter.
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