Bedienungsanleitung Humminbird 365i (Seite 120 von 128) (Englisch)

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Grayscale The use of varying shades of gray to represent the strength of the sonar signal

on the display. Traditionally, the strongest sonar signals are represented in black, and

progressively weaker signals are represented in progressively lighter shades of gray.

Noise The unintentional, external sound waves that interfere with the optimal operation

of sonar. Noise appears as random “dots“ on the display and is caused by a variety of

sources. Many Humminbird® products have a Noise Filter menu setting that allows the user

to clear the screen of noise that is difficult to eliminate (also, see Troubleshooting).

Pixels The “picture elements“, or small square blocks, that make up the image on the LCD.

Measured as a vertical by horizontal number (i.e. 640V x 320H), this key specification

typically indicates the quality of resolution. In fishfinders, the total resolution (vertical

multiplied by horizontal) is often less important than the “Vertical Pixel“ resolution because

a greater number of vertical pixels provide finer resolution of targets detected by sonar.

Sonar information on the horizontal axis can vary greatly, depending on boat speed and the

Chart Speed setting.

Power Output The amount of sound energy emitted into the water by the transducer’s

transmitter. Power output is measured using either RMS (Root Mean Square) or P-T-P (Peak-

to-Peak) measurement systems. Either method is acceptable, but it is important when

comparing power outputs, to make sure that the same measurement system is being used

for both outputs, because P-T-P numbers are 8 times higher than RMS numbers. Greater

power output allows the sonar signal to penetrate through weeds and thermoclines, reach

deeper depths and operate more effectively in noisy environments, such as when the boat

is running at high speed.

Pulse Width (Pulse Length) The length of time that a sonar sound burst is transmitted

into the water. Shorter pulse widths provide better target separation, but cannot travel to

great depths. Longer pulse widths provide better depth penetration, but result in poorer

target separation. Humminbird® varies pulse width based on depth to optimize both target

separation and depth performance. See

Target Separation.

Second Return Describes the appearance of a second sonar return below the primary

sonar return (bottom contour) at exactly twice the true depth. The second return is caused

by the same sonar energy bouncing off the bottom once, rebounding to the water surface

and then traveling back down to the bottom to be reflected again. Second returns are more

common in shallow water and over hard bottoms; it is possible to see a third sonar return

under some circumstances. The second return provides useful information to help

determine bottom hardness, as areas with harder bottoms will generally create a second

return. The second return can be used as a guide to set Sensitivity when in shallower water.

Glossary

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