Download Simrad SP90 - REV E Installation manual

Simrad SP90
Measurements/calculations
Value
Unit
Example
Measured time delay (t)
msec
5
Distance from hydrophone to transducer
r = 1.5xt
meter
7.5
20 log r
dB
17.5
volt
0.9
volt
0.32
dB//1V
--9.9
volt
1.8
volt
0.64
U Hydr = 20 log U(RMS)
dB//1V
--3.9
Bearing (° Stb/Port)
°
--36
Tilt angle
°
0
Depth below keel
meter
3
Water temperature
°C
18
Hydrophone voltage U(p--p)
in Omni
U(RMS) = U(p--p)/2/√2
U Hydr = 20 log U(RMS)
Hydrophone voltage U(p--p)
in 11 degrees
U(RMS) = U(p--p)/2/√2
General information
Table 4 Measurements results
SL = U Hydr -- M + 20 log r
OMNI
11°
U Hydrophone
dB//1V
--9.9
M total
dB//1V/µPa
--209.6
20 log r
dB
17.5
SL OMNI
dB//µPa
217.2
U Hydrophone
dB//1V
--3.9
M total
dB//1V/µPa
--209.6
20 log r
dB
17.5
SL 11°
dB//µPa
223.2
Table 5 Source level (SL) for Onmi and 11 degrees
16
Fill in the M total from the Test hydrophone data table
into the Source Level (SL) table.
→
17
The Test Hydrophone Data table is shown as table 3 on
page 151.
Perform the SL calculations as detailed in the table, and
compare the result with the specifications for the sonar.
- SL Omni: 217 ± 2 dB//µPa
- SL 11 degrees: 223 ± 2 dB//µPa
154
851-164510 / Rev.E