JW Fishers SCAN-650, Руководство по эксплуатации

Страница: 15 / 47

15
The TVG amplifier has three operator controls. They are located on the top panel of the Sonar
Processor. Recommended settings for the TVG controls are provided in the Operation Section of this
manual. Final TVG adjustments are made by the operator while the unit is running. The function of these
controls is to adjust the amplifiers to compensate for losses that occur when the signal travels through
the water. When they are adjusted properly, a reasonably even color is displayed across the screen
during side scanning. The even color is the result of reflections off the bottom.
Near Gain - Adjusts the TVG gain at the start of the sweep (objects close to the scanning head).
Far Gain - Adjusts the TVG gain at the finish (objects furthest from the scanning head). Operator
adjusts for even color of the displayed line.
Overall Gain - Adjusts the gain of the complete line up or down. It adjusts overall darkness or lightness.
A
m
p
l
i
t
u
d
e
Overall Gain Increases Or
Decreases The Overall Gain
(Amplitude) Of The Complete Line
Near
Gain
Far
Gain
Overall gain adjusts the overall amplitude
of the signal (increases or decreases it).
LEFT CHANNEL GAIN
NEAR GAIN
2
3
5
4
6
7
8
9
10
1
FAR GAIN
2
3
5
4
6
7
8
9
10
1
OVERALL GAIN
2
3
5
4
6
7
8
9
10
1
TVG ADJUSTMENTS
NEAR GAIN FAR GAIN OVERALL GAIN