Kongsberg Simrad ST90, Reference Manual

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If you choose manual scale you must define the upper and lower limits. Set
Minimum
and
Maximum
to the desired values.
Logarithmic or linear scale can be chosen for the presentation. Logarithmic scale is
normally used since this scale offers the best overview of the complete dynamic range.
A linear scale will enhance the differences closer to the maximum value.
Use the
Colour Scale
setting to select the number of colours in the presentation.
Sample Pixel Size
Use
Sample Pixel Size
to define the width and height of each individual sample in the
presentation (in pixels).
Text lines
Two text lines are provided under the graphic presentation.
1 The upper information text line below the graphic presentation specifies the
current colour scale. The colours used are rated from the weakest (in dB) to the
strongest. If you have selected manual colour scale, the values shown here will
be the same as those selected.
2 Every sample received will have a value representing an echo. This is identified
as a
non-zero value.
• The
Min(imum) non-zero
value specifies the weakest echo received (in dB).
• The
Max(imum)
value specifies the strongest echo received (in dB).
If you have selected automatic colour scale, the values will be the same as those
provided in the logarithmic scale in the upper text line.
The number of non-zero and zero samples are also specified.
• The
Non-zeroes
value specifies how many samples that contain an echo signal.
• The
Zeroes
value specifies the number of samples that do not contain any echo.
These are "dead" receiver channels.
Related topics
Pages in the Diagnostics dialog box, page 543
Element BITE dialog box, page 554
Testing the noise conditions and the sonar functionality, page 254
Functions and dialog boxes