YUSHI INSTRUMENTS
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automatic gain. The instrument will repeatedly compute the echo inside the gate automatically and adjust
the gain automatically until the amplitude height of the largest echo is set to 80% of the screen height, as
shown in Figure 3-2.
Note: the wave height after the automatic gain is related to the automatic wave height setting in the
setting menu. If the automatic wave height is set as a certain value (in between 20%-80%), the wave
height after the automatic gain is the height of the value on the screen.
Note: When the DAC curve has been made, press the automatic gain, the instrument will
automatically adjust the compensating gain so as to make the echo inside the gate reach 80% of
the screen. The changes of echoes do not mean the changes of DAC curve. However, if the option is
on the parameter menu and on the gain option, press the automatic gain, the instrument will
adjust the gain automatically. The echo and the DAC cure change simultaneously.
3.9.2 Freezing
The function can freeze and lock the display on the current screen. In the freezing mode, you can
move the gate to measure the echoed signal frozen on the screen.
If you want to freeze the current display, press
. If you want to return the normal mode,
press
again to unfreeze.
Note: in the freezing mode, all the adjustable parameters (gain, sound velocity) can not be adjusted.
3.9.3Wave Peak Memory
Wave peak memory is a function that the instrument compares the “new” with the “old” highest
dynamic echoes automatically and preserves the highest still echo.
Figure 3-1
Figure 3-2