Simrad SU90 - Finalizing the Procedure; Source Level Test Results

SimradSU90
13Performthesourcelevelcalculationsasdetailedinthetable(headerrow),enterthe
resultintorowD,andcomparetheresultwiththespecicationsforthesonar.
Sourcelevelspecication
•Omni:220±1dB//1µPaat26kHz
Finalizingtheprocedure
Thesourcelevelmeasurementshavenowbeencompleted.
Note
Donotremovethehydrophonefromthepositionusedforthesourcelevelmeasurements.
Thisknownpositionwillbeusedforthereceivingvoltageresponse(VR)measurements
inthenextsection.
Sourceleveltestresults
Thetablescreatedforthetestresultsareprovidedbelow.
Table3SLMeasurementsresults
Measurements/calculations
Value
Unit
Example
A
Measuredtimedelay
msec
3.33
R=1,5*t
meter
5.0
B
Distancefrom
hydrophoneto
transducer
20logRdB
14
U(p-p)volt
1.00
U(rms)=U(p-p)/2/√2
volt
0,354
C
Hydrophone
voltageinOmni
UHydr=20logU(rms)dB//1V
-91
Bearing(°stb/port)
°-91
Tiltangle
°-2
Depthbelowkeel
meter
3
D
General
information
Watertemperature
°C18
Table4Sourcelevel(SL)
SL=UHydr-M+20logR
Value
Unit
Example
A
UHydrophonedB//1V
-9.0
B
MtotaldB//1V/µPa
-209.5
C
20logRdB
14
D
SLOmnidB//µPa
214.5
202
381293/A