Kongsberg Simrad ST90, Reference Manual

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b Open the
Operation
menu.
1 Set
Operation
to Normal .
2 Set
Tx Power
to Off .
c Open the
Active
menu.
1 Set
TVG
(Time Variable Gain) to 0 log R .
2 Set
Ping-Ping Filter
to Off .
3 Set
Pulse Type
to CW Short .
4 Set
Frequency
to the start frequency:
5 Set
Horizontal TX Sector
to Omni .
6 Set
Vertical TX Sector
to Normal .
7 Set
AGC
(Automatic Gain Control) to Off .
8 Set
RCG
(Reverberation Controlled Gain) to 0 (zero).
9 Set
Noise Filter
to Off .
d Open the
Setup
menu.
e Select
Diagnostics
to open the dialog box.
f Select
Noise
to open the page.
g Select
Start Noise Measurements
.
5 Repeat for each vessel speed and operating frequency.
a Ask the bridge to set the speed.
b If possible, verify the vessel speed on the top bar.
c Read the noise value from the noise circle.
d Record the values in the result table.
e Repeat for every 2 kHz up to and including the highest test frequency: 90 kHz
1 Increase the operating frequency with 2 KHz.
2 Read the noise value from the noise circle.
3 Record the values in the result table.
f Ask the bridge to set the next speed.
6 When all the measurements have been made, type the data (speed and noise) into a
spreadsheet to create the curve.
Simrad ST90 Reference Manual