ADVANCED TVT ADJUSTMENT (P830 to P835)
P830 TVT TYPE
Use this feature to select the TVT Curve desired.
This feature is automatically altered when Material (P002) is altered. Do not
use "TVT Slopes" with the "bF" or "bLF" Algorithm (P820).
values: 1 = TVT Short Curved
2 = TVT Short Flat
3 = TVT Long Flat
4 = TVT Long Smooth Front
5 = TVT Long Smooth
6 = TVT Slopes
P831 TVT SHAPER
Use this feature to turn the TVT Shaper "on" or "off".
Turn the TVT Shaper "on" before altering TVT Shaper Adjust. After using
TVT Shaper Adjust (to avoid a false echo or pick up the true echo), turn the
TVT Shaper "on" and "off" while monitoring the effect.
values: 0 = off
1 = on
P832 TVT SHAPER ADJUST
Use this feature to bias the shape of the TVT curve, in order to avoid it
crossing false echoes from fixed objects.
Adjustment to this parameter is best done while viewing the echo profile on
an oscilloscope (refer to P810). When using an oscilloscope, the Echo Lock
Window display becomes the TVT Curve Pointer.
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 ...
selects the Auxiliary function
e.g. index, breakpoint 1, value 0
auxiliary function
PL-507 140
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