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Simrad SP 270

M~.J~~"

F~~,

I;~9JJ!~it~,

c~lculations in table 2, and enter the

results

of the 20

logr and the U Hydr. into table

3. Also fill in

the M total

from table 1 into table 3.

SL = UHydr - M

+ 20 logr

U Hydrophone dB//l V

OMNI

M total

dB//IV/~Pa

209.

20 log r

17.

SL OMNI dB/ /~Pa

217.

U Hydrophone dB/ /1 V

110

M total

dBI /1 V

/~Pa 209.

20 log r

17.

SL 110 dB//~Pa 223.

Table Source Level (SL) for OMNI

and

110

Make the SL calculations

, and

compare the result with the

specifications for the sonar:

SL OMNI:

SL 110

217 :f: 1 dB//~Pa

223 :f: 1 dB//~Pa

Note! DO NOT remove the hydrophone from the

position used for the

source level measurements. This

known position should also be

used for the receiving voltage response

(VR) measurements in

the next chapter.

When finished with the measurements

, remember to move the

wires in cable pair no. 6 in the Transceiver Unit back to the

following positions:

- Red

wire on E201-49 should be moved back to E201-

31.

- Blue

wire on E201-

46 should be moved back to E201-

33.

Cable screen should be connected to E201-35.

160573/A

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