Table of Contents
Advertisement
Chapter 1 Echo Adjust/Display Setup
1.5 Change of dynamic range of Echo
Echo Adjust - Dynamic Range*
LF1, LF2
The dynamic range of reflected signal (color
gradation) can be adjusted.
1. Press
.
2. Select [Echo Adjust] - [Dynamic Range
XXX].
3. Press [ ] of
The setup box of [Dynamic Range] will be
displayed.
4. Press [▲] and [▼] and select a value.
When the value is small, the expression
range of strong and weak signal change
is narrow, weaker signal will become
undistinguished. When the value is larger,
the expression range is wider and the
weaker signals become distinct.
5. Press
to close the menu.
1.6 Making of reflection strength at
shallow and deep depth equal
At [Optimized] of TVG Type, it is set as the
bottom signal can be seen at a constant
level. At [Manual], the reflection strength of
fish depending on the depth can be set to be
seen uniformly.
Main changing items here are as
follows:
•
To change TVG Type
•
To change TVG Strength
•
To change TVG Depth
•
To change TVG start point
*1
Dynamic Range: This is the function to expand and narrow down the signal range from blue to red in
images.
*2
TVG (Time variable gain): The signal strength is different between deep and shallow water and this is the
1-10
1
HF1, HF2,
.
function to correct this.
1.6.1 Changing of TVG Type
2
TVG*
- TVG Type
TVG is a function to display images, by
correcting the attenuation of ultrasonic
sound through propagation in water and by
making reflection strength from deeper and
shallower depth equal,
1. Press
.
2. Select [TVG] - [TVG Type]
3. Press [ ] of
The setup box of [TVG Type] will be
displayed.
4. Press [▲] and [▼] to select a type.
At [Optimized], bottom signal will be
corrected to be a constant level at all
ranges. At the [TVG Adjust], it is possible
to change the effect of correction on
signal shallower than the start point.
At [Manual], user is to set [TVG Strength],
[TVG Depth] and [TVG Adjust] to produce
desired performance. (See the Instruction
Manual [Basic], "2.2.6 Adjustment of
TVG").
How to adjust TVG:
•
Setup a gradient of gain variation at
[TVG Strength].
•
Setup a reference depth for
correction at [TVG Depth].
•
Setup a start depth for correction at
[TVG Adjust].
5. Press
to close the menu.
JFC-180BB
.
7ZPNA4619A
Advertisement
Table of Contents
