Siemens SITRANS LR 300, Инструкция по эксплуатации, Страница: 79 / 140

7ML19985CL02 SITRANS LR 300 – INSTRUCTION MANUAL Page 77
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Adjust this parameter while viewing the echo profile with Dolphin Plus. Refer to the
Dolphin Plus online help for details. The TVT curve is divided into 40 breakpoints, which
you can access via the 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 changed accordingly. By
changing the value of adjacent breakpoints, the effective bias to the shaper can be
broadened to suit the desired correction. If you are experiencing more than one false
echo, you can apply additional shaping can along different points of the curve. Apply
shaping sparingly in order to avoid missing the true echo.
To change a breakpoint:
1. Confirm that P831, TVT shaper, is
ON (1)
.
2. Go to P832.
3. Press TOGGLE to open the secondary index field.
4. Press ARROW keys to scroll through the 40 points, (or type in the desired
point).
5. Enter the value from –50 to 50.
6. Press ENTER to set the value.
Notes:
• Press PROGRAM to toggle between RUN and PROGRAM mode.
• Press TOGGLE twice to open parameter fields.
SITRANS LR 300.book Page 77 Monday, June 10, 2002 7:18 PM