Simrad SP70 Installation Manual page 162

Simrad SP70
Measurements/calculations
Measured time delay (t)
Distance from hy-
drophone to trans- drophone to trans-
ducer
Hydrophone voltage
in Omni in Omni
Hydrophone voltage U(p--p)
in 11 degrees
General information
146
9 Access the Horizontal menu.
10 Push the Ping Sector button, and observe the Ping Sector
submenu appear at the bottom of the menu field.
11 Select Sector.
12 Read the oscilloscope measurements, and use the manual
training controls on the Operating Panel to obtain maximum
possible hydrophone voltage.
13 Enter the bearing angle, tilt angle, depth and water
temperature into the Measurements results table below.
Refer to table 4.
→
14 Make the requisite calculations in the Measurements results
table.
The Measurement results table is shown as table 4.
→
15 Enter the 20 log r and U Hydr. values from the
Measurements results table into the Source Level (SL) table.
The Source Level (SL) table is shown as table 5.
→
r = 1.5xt
20 log r
U(p--p)
U(RMS) = U(p--p)/2/√2
U Hydr = 20 log U(RMS)
U(RMS) = U(p--p)/2/√2
U Hydr = 20 log U(RMS)
Bearing (° Stb/Port)
Tilt angle
Depth below keel
Water temperature
Table 4 Measurements results
Value Unit
msec
meter
dB
volt
volt
dB//1V
volt
volt
dB//1V
°
°
meter
°C
Example
5
7.5
17.5
0.8
0.28
--11.0
1.6
0.57
--4.9
--36
0
3
18
851-164336 / D