Siemens sitrans LU01 Instruction Manual page 82

Select the TVT type which gives the highest confidence (P805) under all level conditions.
Use this parameter with caution, and do not use TVT Slopes with the bF or bLF Algorithm
(P820).
P831 TVT Shaper
Turns the TVT Shaper ON or OFF.
Values
Related
Turn the TVT Shaper ON before using P832 and afterwards. Turn the TVT Shaper ON and
OFF while monitoring the effect to pick up the true echo.
P832 TVT Shaper Adjust
Allows manual adjustment of the TVT curve.
Primary Index
Values
Related
Use this feature to bias the shape of the TVT curve to avoid selecting false echoes from
fixed objects.
Adjust this parameter while viewing the echo profile with Dolphin Plus. Refer to the
Dolphin Plus online help for details. If Dolphin Plus is not available, then an oscilloscope
can be used. When using an oscilloscope, the Echo Lock Window display becomes the
TVT Curve Pointer. See
The TVT curve is divided into 40 breakpoints, accessible by enabling the point number as
the breakpoint index field. Each breakpoint is normalized to a value of 0, as displayed in
the parameter value field. By changing the breakpoint value, up or down, the intensity of
the bias applied to that breakpoint of the curve is respectively changed. By changing the
value of adjacent breakpoints, the effective bias to the shaper can be broadened to suit
the desired correction. In the case of multiple false echoes, shaping can be applied along
different points of the curve. Shaping should be applied sparingly in order to avoid
missing the true echo.
To change a breakpoint
1. Confirm that P831, TVT shaper, is on.
2. Go to P832.
3. Press MODE
4. Press MODE
5. Press
P
curve pointer right or left respectively.
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0 * Off
1 On
• P832 TVT Shaper Adjust
Breakpoint
Range: -50 to 50
Preset: 0
• P810 Scope Displays
• P831 TVT Shaper
P810 Scope Displays
and then press DISPLAY
to select the Auxiliary function.
to scroll the breakpoint index through points 1 to 40, and move the
P
SITRANS LU01 – INSTRUCTION MANUAL
on page 71 for more information.
to access the Breakpoints.
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