Installation manual

Introduction
43
851--160117 / B
Measurements/calculations Value Unit Example
Noise level dB --25.2
Hydrophone
v
o
l
t
a
g
e
U(p--p) volt 0.27
v
o
l
t
a
g
e
U(RMS) = U(p--p)/2Ö2 volt 0.095
U Hydr = 20 log U(RMS) dB//1V --20.4
Table 4 Measurement and calculation results
Make the requisite calculations in table 4 and enter the result into
table 5. Also find the hydrophone sensitivity as transmitter S
(table 1) and the 20 log r value (table 2) and enter it into table 5.
VR = ¸(S + U Hydr ¸ 20 log r)
Data Value Unit Example
S = S Hydrophone
dB//mPa/V
119.2
U Hydrophone dB//1V --20.4
20 log r dB 17.5
VR (Voltage Response)
dB//1V/mPa
--81.3
Table 5 Receiving voltage response (VR)
Expected receiving voltage response is approximately:
VR = -82 ? 3 dB//1V/mPa
When finished, remember to set the menu settings back to
STANDARD in the menu.