Installation manual

Simrad SP90
154
851-164510 / Rev.E
Measurements/calculations Value Unit Example
Measured time delay (t) msec 5
Distance from hy-
d
r
o
p
h
o
n
e
t
o
t
r
a
n
s
-
r = 1.5xt meter 7.5
d
rop
h
one
t
o
t
rans-
ducer
20 log r dB 17.5
Hydrophone voltage
i
n
O
m
n
i
U(p--p) volt 0.9
in Omni
U(RMS) = U(p--p)/2/√2 volt 0.32
U Hydr = 20 log U(RMS) dB//1V -- 9 . 9
Hydrophone voltage U(p--p) volt 1.8
in 11 degrees
U(RMS) = U(p--p)/2/√2 volt 0.64
U Hydr = 20 log U(RMS) dB//1V -- 3 . 9
General information Bearing (° Stb/Port) ° -- 3 6
T ilt angle ° 0
Depth below keel meter 3
W ater temperature °C 18
Table 4 Measurements results
SL = U Hydr -- M + 20 log r
U Hydrophone dB//1V -- 9 . 9
OMNI
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
11°
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.
→ The Test Hydrophone Data table is shown as table 3 on
page 151.
17 Perform the SL calculations as detailed in the table, and
compare the result with the specifications for the sonar.
- SL Omni: 217 ± 2dB//µPa
- SL 11 degrees: 223 ± 2dB//µPa