Installation manual

Simrad SD570 / Base version
42
851--160117 / B
8.3 Receiving voltage response (VR)
In order to measure the receiving voltage response, use the test
hydrophone in the same position as for the source level
measurements.
Use the following menu settings:
RANGE......: 3500 M
GAIN.......: 50
MODE.......: BOW UP
PULSEFORM..: CW-NORM
TX POWER...: OFF
PINGSECTOR.: OMNI
FREQUENCY..: 27 KHZ
TVG........: OFF
AGC........: OFF
RCG........: OFF
PP-FILTER..: OFF
COLOURTHRES: 0
DISPLAYGAIN: 9
Enter the TEST menu and locate the line with the text: ECHO
LEVEL. Check that the bearing and tilt angle are the same as for
the source level measurements (see table 2), and read the ECHO
LEVEL, which without a signal oscillator connected, is the noise
level for the selected bearing. Enter the readout value into NOISE
LEVEL in table 4.
Connect a signal oscillator to the hydrophone, adjust the
frequency to 27.0 Hz, and connect an oscilloscope to measure the
output voltage to the hydrophone.
Adjust the oscillator voltage until the ECHO LEVEL readout is 0.0
dB. Enter the measured hydrophone voltage U(p-p) into table 4
and calculate the U Hydr voltage as shown in the same table.