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 TVT Shaper Adjust has
been used to modify the TVT Curve (to avoid a false echo or pick up the true echo), this
feature allows the TVT Shaper to be turned "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 ...
with the desired transducer point selected
sets the point number to index.
selects the Auxiliary function
scrolls the breakpoint index through
points 1 to 40, and moves the curve
pointer left or right respectively.
And,
changes the bias value of the
breakpoint, -50 to 50
%
e.g. transducer 1
e.g. index, breakpoint 1, value 0
%
auxiliary function
P
PX XX
e.g. oscilloscope displays breakpoint 5, value 0
e.g. breakpoint 5, value 14
PL-508 68
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