ibaPADU-8-ICP Manual
9
Programmable Settings of the Device
Each ibaPADU-8-ICP is programmable. A single, common sampling rate for all chan-
nels may be set. Each ICP
®
input channel has a programmable gain and filter setting
as well.
9.1
Sampling Rate
The sampling rate can be programmed via the ibaFOB interface in steps of 50 nano-
seconds from 40
s (25 kHz) to 2 ms (500 Hz). The chosen sample rate is then com-
mon for all channels, analog and digital.
9.2
Input Gain
The following table displays the possible gain settings for an ICP
®
input channel. Notice
that for small gain values, incremental steps of 0.5 dB are possible. After about 40 dB,
the steps are larger from 1 dB to 6 dB at the end of the scale. Because the device may
not reach a gain that is requested via an ibaFOB telegram, the device returns the ac-
tual gain setting when measurements begin.
Table 1. Possible Input Gains
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5 0.5 dB step area
5.0
5.5
6.0
6.6
6.9
7.5
8.0
8.4
9.1
9.6
9.9
10.5
11.1
11.4 12.0
12.4
13.2
13.6
14.0
14.4
14.9
15.4
15.9
16.5 17.1
17.7
18.4
19.2
20.0
20.5
21.0
21.5
22.0
22.5 23.0
23.5
24.0
24.5
25.0
25.5
26.0
26.6
26.9
27.5 28.0
28.4
29.1
29.6
29.9
30.5
31.1
31.4
32.0
32.4 33.2
33.6
34.0
34.4
34.9
35.4
35.9
36.5
37.1
37.7 38.4
39.2
40.0
40.9
41.9
43.1 1-1.5 dB step area
44.4
46.0
48.0 50.5 54.0
60.0
bigger
steps
Tip
Typical ICP
®
circuits have a settling time of 3-4 seconds after gain changes. This is
also true when the sensor saturates the circuit.
Note
With an input gain of 40 dB and higher, the signal/noise ratio quickly deteriorates. This
can be an indication that a more sensitive sensor is required, e.g. 1000 mV/g instead of
100 mV/g.
Issue 1.7
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