Testing The Operating Functionality Of The St90 System; Measuring The Noise With The Transducer Disconnected - Kongsberg Simrad ST90 Manual

Simrad ST90 Factory Acceptance Test
Testing the operating functionality of the ST90
system
Topics
Measuring the noise with the transducer disconnected, page 24
Measuring the B-Scan noise with the transducer disconnected from the Transceiver Unit,
page 26
Testing the user interface to verify basic functionality, page 28

Measuring the noise with the transducer disconnected

Low noise is a key factor for high quality and reliable measurements. The performance of
the ST90 system will always be limited by different noise sources. A high noise level will
mask the echoes and make them difficult to read and interpret. The noise is measured while
the ST90 system operates in Passive mode with the transducer disconnected.
Prerequisites
The ST90 system has been set up with its hardware units connected as specified in the
Installation Manual. The hull unit and the Motor Control Unit are replaced with a hull unit
simulator. The transducer is replaced with a dummy load. The ST90 system is turned on and
operates normally. Neither tools nor instruments are required.
Context
This task allows you to check the noise conditions. To measure the noise level, observe the
value presented on the
Note
This task must be done with the transducer cable disconnected from the transceiver.
Procedure
1 Open the
Operation
2 Set to Off.
Tx Power
3 Disconnect the dummy load from the transceiver output.
4 Make the following preparations.
24
page in the
Noise Diagnostics
menu.
dialog box.
442728/B