Siemens sitrans LU10 - Page 73

7ML19985AN02 SITRANS LU10 – INSTRUCTION MANUAL Page 69
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Enhancement Parameters
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
Press to set the point number to
index.
Press to select the Auxiliary function
Press to scroll the breakpoint
index through points 1 to 40, and move the
curve pointer left or right respectively.
Press to change the bias value of the
breakpoint, -50 to 50
Press to enter the change in value.
To select another transducer
Press to set the point number to
transducer. Select desired transducer point.
P831, TVT shaper, must be ‘ on ’.
P831, TVT shaper, must be ‘ on ’. P831, TVT shaper, must be ‘ on ’.
P831, TVT shaper, must be ‘ on ’.
e.g. transducer 1
e.g. index, breakpoint 1, value 0
auxiliary function
P P
e.g. oscilloscope displays
breakpoint 5, value 0
e.g. breakpoint 5, value 14
e.g. return to transducer 1