P831 tvt shaper, P832 tvt shaper adjust – Siemens sitrans LU01 User Manual
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SITRANS LU01 – INSTRUCTION MANUAL
7ML19985BE02
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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.
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.
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
P810 Scope Displays on page 71 for more information.
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
and then press DISPLAY
to access the Breakpoints.
4.
Press MODE
to select the Auxiliary function.
5.
Press
to scroll the breakpoint index through points 1 to 40, and move the
curve pointer right or left respectively.
Values
0
*
Off
1
On
Related
•
P832 TVT Shaper Adjust
Primary Index
Breakpoint
Values
Range: -50 to 50
Preset: 0
Related
•
P810 Scope Displays
•
P831 TVT Shaper
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