Kongsberg Simrad ST90, Справочное руководство

Страница: 556 / 690

554
442704/A
C
The preamplifiers are very sensitive. They can easily pick up electrical noise from
internal and external power supplies. The preamplifiers are also vulnerable to analogue
noise created by their own electronic circuitry. Digital noise created by the converter
and processing circuitry can also create noise problems.
D
The converters transform the analogue echoes to digital format.
E Signal processing circuitry can create digital noise.
Noise Test
Select
Start Noise Measurements
. This starts the noise test. The test is run continuously
on each of the following pings until you stop it.
Noise Frequency Test
Select
Start Test
. This starts the noise test. The test runs continuously until you stop it.
The test measures the noise in each beam for operating frequency. It runs through all
the frequencies, and then starts again with a new loop.
For each loop, the test results are saved on the hard disk on XML format. The result
file specifies:
• Vessel speed
• Operating frequency
– noise (Minimum, Average, Maximum)
– Noise in each beam
The file is located in the following folder:
programdata/Simrad/ST90/log
Related topics
Pages in the Diagnostics dialog box, page 543
Setup menu; Functions and dialog boxes, page 452
Testing the noise conditions and the sonar functionality, page 254
Functions and dialog boxes, page 416
Diagnostics dialog box, page 462
Element BITE dialog box
The purpose of the
Element BITE
(Element Built-In Test Equipment) dialog box is to allow
on-line test and verification of the individual elements in the transducer.
How to open
Open the
Element BITE
dialog box from the
Processor
page in the
Diagnostics
dialog box.
Open the
Diagnostics
dialog box from the
Setup
menu.
Simrad ST90 Reference Manual