Manual Simrad ER60 (page 42 of 182) (English)

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Simrad ER60 Operator manual

850-164692 / Rev.B

However, this is only possible if the split beam transducer has

been correctly installed.

Data editing

In both the Information and Plot views, you may perform data

editing in the sense of excluding or including an accepted single

echo detection. A left or right mouse click will act as a toggle

function for this editing. The model is completely recalculated

for each change.

In the Information view, a suspended single echo will be

identified with an asterisk (*) on the left side of the view.

The Plot view will draw an “empty” circle to indicate

suspension of the single echo entry.

The data deviation from the beam model should for a good

calibration give a RMS value less than 0.2 dB. If unwanted

echoes have been observed during data collection, these should

preferably be removed from the file. If, when collecting data,

fish swim into the layer that includes the reference target, then

note where in the file this happens, and delete these echoes

before the beam data are updated. Data with large deviation

from the calculated curve are may be caused by poor acoustic

conditions or by back scattering objects other than the reference

target. Isolated echoes with large deviation from the calculated

beam pattern can be removed, but when a large amount of the

collected data diverge from the average, this indicates that the

acoustic conditions has been unfavourable. When the RMS

value is in between 0.2 and 0.4dB, this indicates conditions is

not perfect but still acceptable. When the RMS value is higher

than 0.4 dB the calibration is poor, and should preferably be

rejected and not used for updating of the transducer parameters.

Updating transducer parameters

When you are satisfied with the calibration results you can use

the results to update your transducer parameters in the echo

sounder.

1 In the Calibration window, open the File menu and

choose Update Beam Data to perform this task.

Note This is a serious operation, which will affect the transducer

installation parameters and will thus affect all future results to

be obtained using the current transducer and pulse duration.

Thus, to prevent accidentally use of t his operation, you are

asked to confirm this operation.

The changes take effect automatically the next time you start

normal operations on the echo sounder.

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Simrad ER60 Manual

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