2 Adjusting the TVG (Time Variable Gain) setting
When an acoustic pulse is sent through the water, it will gradually lose its energy. The greater the distance between the transducer and the target(s), the greater the loss of energy. TVG (Time Variable Gain) compensates for the loss of acoustic energy due to geometric spread and absorption. Use the TVG button or the Echogram dialog box.
Context
The TVG (Time Variable Gain) compensation is designed to counteract the natural phenomena of geometric spread and absorption
loss. In the EK80 system, the TVG compensation is made using digital signal processing software.
Tip
You can select TVG using this function. You can also adjust the TVG setting in the Echogram dialog box. The TVG function is located on the Echogram page.
Procedure
| 1 | Click any echogram view to make it active. The setting(s) are only applied to the currently active echogram. The active echogram view is identified with a thick border.
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| 2 | Open the Active menu. |
| 3 | Locate the TVG button. |
| 4 | Select the TVG setting you want to use.
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| 5 | Select Apply to All if you wish to use the chosen setting on all the echograms of the same type. |