（press）
SRA Open SRA
It can be on or off while COMPOUND is
off.
SK4
（rotate）
Persistence
Increase/decrease the contrast
resolution of the image
0~7 grade adjustable，clockwise for
increasing, anticlockwise for decreasing.
Adjust range: 1.
（press）
Density Change the image density High and Low adjustable
SK5
（rotate）
Noise reject Adjust the image noise suppression
Adjust range: 0-255，clockwise for
increasing, anticlockwise for decreasing.
Adjust range: 1.
Other adjustments：
1 Depth（DEPTH toggle key）
DEPTH toggle key is used for the adjustment of image depth. Depth will increase if adjust downward; Depth
will decrease if adjust upward. For the best resolution of focusing and edge enhancement, it needs to adjust
TGC after the depth has been adjusted.
2 Focus control（FOCUS toggle key）
Add a specific area to achieve the decomposition of image focusing optimization. Increase focusing
numbers or move focusing position could increase the resolution of the special areas and strengthen
scanning of special areas.
Adjust FOCUS toggle key could do up/down movements for launching the focusing position.
Note
：
：：
：
Change focus numbers will affect the frame rate. Frame rate will be slow if focus numbers are
increased.
3 Scanning direction（left/right invert key, up/down invert key）
Under the single display mode, the scanning direction will be left/right inverted if press the left/right invert
key; images scanning direction will be up/down inverted if press U/D key.
4 Gain（B knob）
Adjust gain of B mode could enhance or reduce quantities of echo information in images. Adjust the main
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