Beam Mode dialog box
Through the Beam Mode dialog box you can edit or view the operational parameters of the currently chosen beam mode. The beam mode describes the acoustic properties of the ME70 system. You can create and maintain several different beam modes, and use these to set up the ME70 system for specific survey activities.
The Beam Mode dialog box is opened in one of two possible ways:
•  The View Beam Mode menu button on the Operation menu.
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•  The Edit button in the Beam Mode Administration dialog box.
The Beam Mode Administration dialog box is opened by selecting the Beam Mode Administration button on the Setup menu.
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Note
When the Beam Mode dialog box is opened from the View Beam Mode menu button on the Operation menu, you will not be able to do any changes to the beam parameters. In order to change the parameters, you must access the dialog through the Beam Mode Administration dialog box on the Setup menu.
Beam Mode Adm. is located on the Setup menu.
Description
The Beam Mode is designed with multiple tabs.
Details
•  Frequency Band
The parameters in the Frequency Band page are used to control the frequencies and pulse shapes of the currently selected beam.
•  Reference Beams
The parameters in the Reference Beams page are used to control the two reference beams.
•  Fan of Beams
The parameters om the Fan of Beams are used for controlling the beams in the acoustic fan.
•  Calibration
The Calibration page parameters controls which calibration mode is used during the operation of the ME70 while in the currently selected beam mode.
•  Frequency Plot
The Frequency Plot page presents the frequency allocation for all beams in the currently selected beam mode
•  Beam Directions Plot
The Beam Directions Plot page presents the theoretical opening angle and steering for all the beams in the currently selected beam mode.This is an example mode for short and medium range surveys.
•  Weight Set Plot
The Weight Set Plot page presents the weight arrays used for all the beams in the currently selected beam mode.
•  Beam Pattern Plot
The Beam Pattern Plot page presents the theoretical beam pattern for all the beams in the currently selected beam mode. The beam patterns are plotted on a relative scale to be valid for all the beams in the fan.
•  Beam Delay Plot
The Beam Delay Plot page shows the transmit order of the different beams in the mode. Beams with identical delay are transmitted in the same group. The beams with the least delay are transmitted first.
•  Tx Amplitude Plot
The Tx Amplitude Plot page presents the theoretical sum of the frequencies (beams) transmitted in the different transmission groups.
Beam Modes
This text field lists the current beam modes. To delete or edit one of them, select the name and then select Edit or Delete.
Tip
The four numbers in the Beam Mode button at the top of the Main menu will select the four beam modes listed at the top of the beam mode list in the Beam Mode Administration dialog box. This list is sorted alphabetically. To control which modes to choose using the four numbers, name your beam modes accordingly, for example by means of prefixes.
Mode Description
This text field lists the text description provided for the beam mode currently selected in the Beam Modes text field. This text field is open for edits, and you can freely enter or modify any descriptive information.
Edit
This opens the Beam Mode dialog box for the appropriate beam mode. The Beam Mode dialog box allows you to edit the beam mode’s current operational parameters. When editing a calibrated mode you must ensure the changes you have made are compatible with the calibration data stored with the configuration.
Delete
Select this button to delete the highlighted beam mode. When deleting a beam mode you will receive a verification question if you really want to delete the beam mode. If the beam mode has been calibrated previously you will receive a second verification question on whether or not you want to delete the beam mode.
New
This button creates a new beam mode. The Beam Mode dialog box is provided to enter the name of the new beam mode. The new beam mode will be created with a default configuration, and you must edit these parameters using the Edit button.