Siemens LR 460 用户手册
7ML19985JM01
SITRANS LR 460 – INSTRUCTION MANUAL
Page 59
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3.5.6.3. TVT Hover Level
Defines in percent how high the TVT (Time Varying Threshold) curve is
placed above the echo profile, with respect to largest echo.
3.5.6.4. Manual TVT Shaper Mode
Enables the TVT curve to be manually adjusted at a specified range.
3.5.7. Manual TVT shaper
You can manually adjust the TVT curve by entering values for up to 120
breakpoints on the curve.
Use this feature to bias the shape of the TVT curve to avoid selecting false
echoes from fixed objects.
echoes from fixed objects.
Each breakpoint is normalized to a value of 0. Change the value of the
breakpoints to adjust the curve. 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.
breakpoints to adjust the curve. 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.
The Manual TVT shaper feature allows you to adjust the TVT curve while viewing
the echo profile.
the echo profile.
To change a breakpoint via PDM:
a. Confirm that Shaper Mode is selected.
b. Open the menu Device – TVT Shaper then either adjust the curve manually, or
b. Open the menu Device – TVT Shaper then either adjust the curve manually, or
enter values for the desired breakpoints. (See
38.)
To change a breakpoint via the handheld programmer:
a. Confirm that Shaper Mode is selected.
b. Access the submenu for the breakpoint number in question and enter values
b. Access the submenu for the breakpoint number in question and enter values
for all desired breakpoints.
3.5.7.1. Shaper A (1 - 9).
3.5.7.2. Shaper B (10 - 18)
3.5.7.3. Shaper C (19 - 27)
3.5.7.1. Shaper A (1 - 9).
3.5.7.2. Shaper B (10 - 18)
3.5.7.3. Shaper C (19 - 27)
Values
Range: 0 to 100%
Default: 40%
Default: 40%
Options
ON
*
OFF
Values
Range: -50 to 50
Preset: 0
Preset: 0
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