Kongsberg Simrad SN90 Reference Manual page 617

Purse seine and trawling sonar

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The settings provided by the

Size Distribution

you to shape the vertical

bars in the Size Distribution

information pane to meet your

own requirements. You can

define the upper and lower

limits, the accuracy, and the

vertical resolution.

The measurement accuracy

in the Size Distribution

information pane depends

on the vertical angle of the

inspection beam. A beam that points nearly straight down corresponds to a traditional

echo sounder. This gives the best accuracy since the fish is then viewed from above. If

you use a smaller beam angle, you may see the fish from the front or back. This gives

significantly smaller echoes, and thus low measurement accuracy.

function specifies if the histogram shall present the size distribution

based on the fish size, echo strength, or fish weight.

The histogram shows the size distribution as a length in metric units.

The histogram shows the size distribution as an echo strength value i dB.

The histogram shows the size distribution as a weight in metric units.

Follow Fish Gain Colour Scale

Select this option to let the threshold follow the minimum level defined on the

page for the corresponding channel.

Colour Scale

Manual Scale

Choose the lower and upper limits (in dB) of the scale.

This function specifies the lower limit of the target strengths shown in the

histogram. The value reflects the current mode you have chosen.

Functions and dialog boxes

Chapters

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