903-0628-00 Rev. 1
Model 903-HD User's Guide – FMB-X-2.5
Focal Technologies Corp.
Page 4-22
4.3.6 Hydrophone/Analog Plug-In (AIB-HYDRO)
Card P/N 903-0244-00 (AIB-HYDRO, surface)
Card P/N 903-0244-02 (AIB-HYDRO, subsea)
The AIB-HYDRO hydrophone plug-in module, shown in the figure below, is suitable for use with many
hydrophones and other types of low-level analog signals. The board is used at both ends of the system and
must be jumper configured, typically, as an input for the remote (subsea) module or as an output for the
console (surface) module per the settings in Table 4-10.
J14
S1
J12
J11
J13
Figure 4-15: AIB Hydrophone Plug-In Module
Table 4-10: Configuration Settings for AIB Hydrophone Module
Board Set Up
Jumper Configuration*
J11
J12
J13
J14
Input Board (Remote)
2-3
2-3
2-3
2-3
Output Board (Console)
1-2
1-2
1-2
1-2
* Place shunts across the indicated pins of each jumper
The hydrophone board input circuits include a front-end preamplifier with a fixed 36 dB gain and additional
gain supplied by switch bank S1. Inputs are protected with diode clamps and current limiting resistors as well
as ultra-fast fuses on the AIB motherboard. The table below shows the switch S1 gain settings and
corresponding maximum input voltage.
Table 4-11: Hydrophone Gain Settings (Defaults Shaded)
S1 Gain
Av (dB)
S1 Settings
Total Gain
With Preamp
Maximum Input
Voltage (mVpp)
1
2
3
4
30
1
0
0
0
66
1
20
0
1
0
0
56
3.2
10
0
0
1
0
46
10
0
0
0
0
1
36
32
-3
1
1
1
1
33
45
1 = ON = CLOSED, 0 = OFF = OPEN
Summary of Contents for Focal 903
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